Criterion-Related Validity of Consumer-Wearable Activity Trackers for Estimating Steps in Primary Schoolchildren under Controlled Conditions: Fit-Person Study.

The purposes were to examine the criterion-related validity of the steps estimated by consumer-wearable activity trackers (wrist-worn activity trackers: Fitbit Ace 2, Garmin Vivofit Jr, and Xiomi Mi Band 5; smartphone applications: Pedometer, Pedometer Pacer Health, and Google Fit/Apple Health) and their comparability in primary schoolchildren under controlled conditions. An initial sample of 66 primary schoolchildren (final sample = 56; 46.4% females), aged 9-12 years old (mean = 10.4 ± 1.0 years), wore three wrist-worn activity trackers (Fitbit Ace 2, Garmin Vivofit Jr 2, and Xiaomi Mi Band 5) on their non-dominant wrist and had three applications in two smartphones (Pedometer, Pedometer Pacer Health, and Google Fit/Apple Health for Android/iOS installed in Samsung Galaxy S20+/iPhone 11 Pro Max) in simulated front trouser pockets. Primary schoolchildren's steps estimated by the consumer-wearable activity trackers and the video-based counting independently by two researchers (gold standard) were recorded while they performed a 200-meter course in slow, normal and brisk pace walking, and running conditions. Results showed that the criterion-related validity of the step scores estimated by the three Samsung applications and the Garmin Vivofit Jr 2 were good-excellent in the four walking/running conditions (e.g., MAPE = 0.6-2.3%; lower 95% CI of the ICC = 0.81-0.99), as well as being comparable. However, the Apple applications, Fitbit Ace 2, and Xiaomi Mi Band 5 showed poor criterion-related validity and comparability on some walking/running conditions (e.g., lower 95% CI of the ICC < 0.70). Although, as in real life primary schoolchildren also place their smartphones in other parts (e.g., schoolbags, hands or even somewhere away from the body), the criterion-related validity of the Garmin Vivofit Jr 2 potentially would be considerably higher than that of the Samsung applications. The findings of the present study highlight the potential of the Garmin Vivofit Jr 2 for monitoring primary schoolchildren's steps under controlled conditions.

Effect of an activity wristband-based intermittent teaching unit in Physical Education on students' physical activity and its psychological mediators: a cluster-randomized controlled trial. School-fit study.

Objective: The main objective of the present study was to examine the effects of an intermittent teaching unit based on the use of activity wristbands and behavior modification strategies on high school students' perceptions of autonomy support, satisfaction of basic psychological needs, motivation toward Physical Education and physical activity, intention to be physically active, and habitual physical activity levels. Materials and methods: An initial sample of 353 high school students (final sample = 175; 45.7% females; mean age = 13.3 ± 1.2 years) from two public high schools were cluster-randomly assigned into the intermittent (IG, n = 100) and control (CG, n = 75) groups. The IG performed an intermittent teaching unit twice a week for eight weeks. Specifically, the last 15 min of each lesson were used. As the main strategy to promote the practice of regular physical activity, students wore an activity wristband the whole day during the intervention period. Additionally, other behavior modification strategies were also applied (e.g., educational counseling, physical activity goals or reminders). Regarding the CG, during the intervention period (i.e,, the eight weeks that took place the intermittent teaching unit) they also performed two Physical Education sessions, but without using activity wristbands or other behavior modification strategies. Before and after the intervention, as well as at the end of the follow-up period (six weeks), students' physical activity practice mediators and physical activity levels were measured by validated questionnaires. Results: The Multilevel Linear Model results showed that the IG students statistically significantly improved cognitive and procedural autonomy support from pre- to post-intervention (p < 0.05). They also statistically significantly improved autonomy and relatedness basic psychological needs, and autonomous motivation toward physical activity scores from post-intervention to follow-up (p < 0.05). Moreover, the results showed that the IG students statistically significantly improved habitual physical activity scores from pre- to post-intervention, and from post-intervention to follow-up (p < 0.05). Conclusion: The intermittent teaching unit based on the use of activity wristbands and other behavior modification strategies was effective for improving students' autonomy support and habitual physical activity levels, but not the rest of physical activity practice mediators. Clinical trial registration: https://register.clinicaltrials.gov/, ID: NCT05949463.

Validity of activity wristbands for estimating daily physical activity in primary schoolchildren under free-living conditions: School-Fit study.

Introduction: The use of activity wristbands to monitor and promote schoolchildren's physical activity (PA) is increasingly widespread. However, their validity has not been sufficiently studied, especially among primary schoolchildren. Consequently, the main purpose was to examine the validity of the daily steps and moderate-to-vigorous PA (MVPA) scores estimated by the activity wristbands Fitbit Ace 2, Garmin Vivofit Jr 2, and the Xiaomi Mi Band 5 in primary schoolchildren under free-living conditions. Materials and methods: An initial sample of 67 schoolchildren (final sample = 62; 50% females), aged 9-12 years old (mean = 10.4 ± 1.0 years), participated in the present study. Each participant wore three activity wristbands (Fitbit Ace 2, Garmin Vivofit Jr 2, and Xiaomi Mi Band 5) on his/her non-dominant wrist and a research-grade accelerometer (ActiGraph wGT3X-BT) on his/her hip as the reference standard (number of steps and time in MVPA) during the waking time of one day. Results: Results showed that the validity of the daily step scores estimated by the Garmin Vivofit Jr 2 and Xiaomi Mi Band 5 were good and acceptable (e.g., MAPE = 9.6/11.3%, and lower 95% IC of ICC = 0.87/0.73), respectively, as well as correctly classified schoolchildren as meeting or not meeting the daily 10,000/12,000-step-based recommendations, obtaining excellent/good and good/acceptable results (e.g., Garmin Vivofit Jr 2, k = 0.75/0.62; Xiaomi Mi Band 5, k = 0.73/0.53), respectively. However, the Fitbit Ace 2 did not show an acceptable validity (e.g., daily steps: MAPE = 21.1%, and lower 95% IC of ICC = 0.00; step-based recommendations: k = 0.48/0.36). None of the three activity wristbands showed an adequate validity for estimating daily MVPA (e.g., MAPE = 36.6-90.3%, and lower 95% IC of ICC = 0.00-0.41) and the validity for the MVPA-based recommendation tended to be considerably lower (e.g., k = -0.03-0.54). Conclusions: The activity wristband Garmin Vivofit Jr 2 obtained the best validity for monitoring primary schoolchildren's daily steps, offering a feasible alternative to the research-grade accelerometers. Furthermore, this activity wristband could be used during PA promotion programs to provide accurate feedback to primary schoolchildren to ensure their accomplishment with the PA recommendations.

Validity of the Xiaomi Mi Band 2, 3, 4 and 5 Wristbands for Assessing Physical Activity in 12-to-18-Year-Old Adolescents under Unstructured Free-Living Conditions. Fit-Person Study.

The purpose was to assess the validity of four generations of Xiaomi Mi Band wristbands for the assessment of step count and physical activity (PA) levels among adolescents aged 12-18 years under free-living conditions. One hundred adolescents were invited to participate in the present study. The final sample consisted of 62 high-school students (34 females), aged 12-18 years old (Mage = 14.1 ± 1.6 years), who wore an ActiGraph accelerometer on their hip (PA and step count reference measures) and four activity wristbands (Xiaomi Mi Band 2, 3, 4, and 5) on their non-dominant wrist during the waking time of one day. Results showed that the agreement between daily PA levels (i.e., slow, brisk, and slow-brisk pace walking, total PA and moderate-to-vigorous PA) measured by Xiaomi Mi Band wristbands and the accelerometer were poor (ICC, 95% CI = 0.06-0.78, 0.00-0.92; MAPE = 50.1-150.6%). However, agreement between daily step count measured by the accelerometer and the Xiaomi Mi Band wristbands were between acceptable (MAPE = 12.2-13.6%) to excellent (ICC, 95% CI = 0.94-0.95, 0.90-0.97). Furthermore, the Xiaomi Mi Band wristbands have a good to excellent validity for correctly classifying adolescents as meeting or not meeting the recommended 10,000 steps per day (P = 0.89-0.95, k = 0.71-0.87) and the recommended 60 minutes of moderate-to-vigorous PA per day (P = 0.89-0.94, k = 0.69-0.83). Furthermore, comparability between the four Xiaomi Mi Band generations were poor to excellent (ICC, 95% CI = 0.22-0.99, 0.00-1.00) for the daily PA levels outputs, although it was excellent (ICC, 95% CI = 0.99-1.00, 0.96-1.00; MAPE = 0.0-0.1%) for daily step count. Different models of Xiaomi Mi Band wristbands were comparable and presented good validity for measuring adolescents' step count, and they accurately classified adolescents as meeting or not meeting the PA recommendations under free-living conditions.

Are Wrist-Worn Activity Trackers and Mobile Applications Valid for Assessing Physical Activity in High School Students? Wearfit Study.

The purpose was to examine the validity of three wrist-worn commercial activity trackers (Samsung Galaxy Watch Active 2, Apple Watch Series 5, and Xiaomi Mi Band 5) and six mobile apps (Pedometer and Pacer for android and iPhone mobiles, Google Fit for android, and Apple Health for iPhone mobiles) for estimating high school students' steps and physical activity (PA) under free-living conditions. A sample of 56 (27 females; mean age = 14.7 years) and 51 (25 females; mean age = 14.0 years) high school students participated in Study 1 and 2, respectively. Study 1: Students performed a 200-meter course in four different conditions while wearing the wearables. Step counting through a video record was used as the golden standard. Study 2: Students wore the three wrist-worn commercial activity trackers during the waking time of one day, considering ActiGraph model wGT3X-BT accelerometers as a standard of reference. Afterward, the agreement between the PA scores measured by the commercial activity trackers and the video (study 1) or accelerometers (study 2) were calculated as follows: Equivalence test, Limits of Agreement (LOA); Mean Absolute Error (MAE); Mean Absolute Percentage Error (MAPE); and Intraclass Correlation Coefficient (ICC). Results showed that all the wearables presented excellent validity for assessing steps in structured free-living conditions (study 1; MAPE < 5%), although their validity was between poor-excellent based on ICC (95% confidence interval) values (ICC = 0.56-1.00). Regarding Study 2, the Xiaomi wristband and the Samsung Watch presented acceptable-excellent (MAPE = 9.4-11.4%; ICC = 0.91-0.97) validity for assessing steps under unstructured free-living conditions (study 2). However, the Apple Watch presented questionable-excellent validity (MAPE = 18.0%; ICC = 0.69-0.95). Regarding moderate-to-vigorous PA (MVPA) and total PA, only the Apple Watch showed low-acceptable validity for MAPE value and questionable-excellent validity for the ICC values for MVPA assessment (MAPE = 22.6; ICC = 0.67-0.93). All wearables checked in this study have shown adequate validity results in order to assess steps in both structured and unstructured free-living conditions for both continuous and dichotomous variables. Moreover, for assessing MVPA, only the Apple Watch reported valid results for compliance or non-compliance with the daily PA recommendations. However, the results showed low validity for total PA and MVPA as continuous variables. In conclusion, depending on the user's/researcher's aim and context, one or another wearable activity tracker could be more adequate, mainly because of its valid measurements and its costs.

Effects of Consumer-Wearable Activity Tracker-Based Programs on Objectively Measured Daily Physical Activity and Sedentary Behavior Among School-Aged Children: A Systematic Review and Meta-analysis.

BACKGROUND: The popularity of consumer-wearable activity trackers has led the scientific community to conduct an increasing number of intervention studies integrating them to promote physical activity (PA) and to reduce sedentary behavior (SB) levels among school-aged children. Therefore, the aim of the present study was to estimate the effects of consumer-wearable activity tracker-based programs on daily objectively measured PA and SB among apparently healthy school-aged children, as well as to compare the influence of participants' and programs' characteristics. METHODS: Eligibility criteria were: (1) participants: apparently healthy school-aged children (< 18 years old); (2) intervention: aimed to promote PA and/or to reduce SB incorporating consumer-wearable activity trackers; (3) comparator: baseline measurements and/or a control/traditional group; (4) outcomes: objectively measured daily PA and/or SB levels; (5) study design: pre-experimental, quasi-experimental, and true-experimental trials. Relevant studies were searched from eight databases up to December 2020, as well as from four alternative modes of searching. Based on the Cochrane Risk-of-bias tool 2, the risk of bias was assessed following four domains: (1) randomization process; (2) missing outcome data; (3) measurement of the outcomes; and (4) selection of the reported results. Based on a comprehensive systematic review, meta-analyses of the Cohen's standardized mean difference (d) and 95% confidence interval (CI) with a random-effects model were conducted to estimate the overall effects, as well as the within- and between-study subgroups analyses effects, of the programs on daily total steps, moderate-to-vigorous PA (MVPA), total PA and SB. RESULTS: Forty-four publications (i.e., 45 studies) were included in the systematic review (5,620 unique participants; mean age = 12.85 ± 2.84 years) and 40 publications (i.e., 41 studies) in the meta-analysis. Programs had a mean length of 11.78 ± 13.17 weeks and most used a waist-worn consumer-wearable activity tracker (77.78% waist-worn; 22.22% wrist-worn). Programs characteristics were: goal-setting strategies (64.06%); participants' logbooks (56.25%); counseling sessions (62.50%); reminders (28.13%); motivational strategies (42.19%); and exercise routine (17.19%). Results showed a statistically significant moderate favorable effect on daily total steps (d = 0.612, 95% CI 0.477-0.746), small favorable effect on daily MVPA (d = 0.220, 95% CI 0.134-0.307), trivial favorable effect on daily total PA (d = 0.151, 95% CI 0.038-0.264) and trivial unfavorable effect on daily SB (d = 0.172, 95% CI 0.039-0.305). Subgroups analyses showed a higher effect for daily total steps and daily MVPA levels in females and the physically inactive for daily total steps (p = 0.003-0.044). Programs with educational counseling and/or goal-setting strategies, as well as a greater number of strategies, were more effective for improving children's daily total steps, and wrist-worn activity trackers were more effective than waist-worn trackers for improving their daily MVPA levels (p = 0.001-0.021). CONCLUSIONS: Consumer-wearable activity tracker-based programs seem to be effective in promoting school-aged children's daily total steps and MVPA levels, especially for females and those that are physically inactive. These programs should include specific goal-setting, educational counseling, and wrist-worn trackers as especially effective strategies. However, due to the certainty of evidence being from "low" to "moderate", future well-designed primary research studies about the topic are needed. PROSPERO: CRD42020222363.

High School Students' Accelerometer-Measured Physical Activity and Sedentary Behavior by Motivational Profiles Toward Physical Activity.

Purpose: Based on a Self-Determination Theory with a person-centered approach, the purposes were: (1) to identify motivational profiles toward physical activity (PA) among high school students, and (2) to compare students' accelerometer-measured PA and sedentary behavior (SB) levels between the motivational profiles toward PA. Methods: The present study followed a cross-sectional design. A total of 394 high school students (173 females; final sample = 360 and 198 for the purposes 1 and 2, respectively) aged 12-16 years completed the study. Participants' PA and SB levels were objectively measured by ActiGraph GT3X+ accelerometers (right hip) during seven consecutive days. Later, motivation toward PA was measured by the Behavioral Regulation in Exercise Questionnaire. Results: Based on a two-stage cluster analysis approach, the results identified three clusters: (1) "Self-determined motivational profile toward PA" (65.3%); (2) "Non-self-determined motivational profile toward PA" (23.9%), and (3) "Controlled motivational profile toward PA" (10.8%). The results of the chi-square test showed that a statistically significantly higher percentage of males were represented in cluster 1 (p < .001). The results of the one-way analysis of variance showed that students from cluster 1 had statistically significantly lower levels of SB, and higher levels of light PA, moderate-to-vigorous PA and total PA than those from cluster 2 (p < .05; |d| = 0.40-0.61). Conclusions: In line with the Self-Determination Theory, the students within the self-determined motivational profile had lower SB and higher PA. This preliminary evidence could inform and guide future policy regarding students' PA promotion.

Composition Factor Analysis and Factor Invariance of the Physical Appearance State and Trait Anxiety Scale (PASTAS) in Sports and Non-Sports Practitioner Mexican Adolescents.

The purpose of the present study was to adapt and validate the Physical Appearance State and Trait Anxiety Scale (PASTAS) for Mexican adolescents, verifying the factor invariance by sports and non-sports practitioners. A sample of 930 Mexican adolescents (46.0% females), aged 11-15 years old, voluntarily participated in the study. A total of 415 participants regularly played sports in a club and/or regularly participated in sports competitions and 515 were non-sports practitioners. The adolescents filled out the trait version of the PASTAS questionnaire, which was previously translated and adapted for Mexican-speaking adolescents following the International Test Commission guidelines. The results of the confirmatory factor analyses showed an adequate measurement model for the original two-factor structure (e.g., GFI = 0.913; RMSEA = 0.078; CFI = 0.943). The internal consistency of the two dimensions was excellent (α and Ω = 0.92-0.93). Additionally, the results of the factorial invariance analyses showed an appropriate fit of the two-structure model (e.g., GFI = 0.96; CFI = 0.98; RMSEA = 0.04) among both sports and non-sports practitioners. The proposed trait version of the PASTAS questionnaire adapted to a Mexican-speaking population shows adequate psychometric properties among Mexican adolescents. The Mexican version of the PASTAS questionnaire supports the original two-factor structure (i.e., factor related to the body weight and factor not related to body weight) among adolescents. Additionally, the factorial invariance analyses support the equivalence of the two-factor structure among both sports and non-sports practitioners.

A comparison of the utility of different step-indices to translate the physical activity recommendation in adolescents.

Previous studies translating the daily moderate-to-vigorous physical activity (MVPA) recommendation of total steps/day among adolescents are inconsistent, and those with cadence-based steps are scarce. The main purpose was to compare the accuracy of different daily steps index-based cut-points related to the daily 60 minutes of MVPA recommendation measured by a waist-worn accelerometer for adolescents. Following a cross-sectional design, 428 Spanish adolescents (final sample 351, 50.4% males), aged 13-16 years old, wore an ActiGraph GT3X/+ accelerometer (reference standard = MVPA; index tests = total steps/day, average steps/min and peak 1-min cadence) on the right hip for eight consecutive days. 32.5% of the adolescents met the daily MVPA recommendation. The multiple ROC curve comparisons showed that the accuracy of the daily total step-based recommendation (AUC = 0.97) was statistically higher than for those with the steps/min (AUC = 0.90) and peak 1-min cadence (AUC = 0.58) (p < 0.001). The 10,000-step-per-day cut-point (k= 0.59-0.83) showed highest accuracy values than the 12,000 steps/day (k= 0.20-0.32). Daily total step-based recommendations are more accurate than those with steps/min and peak 1-min cadence for classifying adolescents as being physically active or inactive. A 10,000-step-per-day target is simple and accurate for both male and female adolescents.

Effect of a physical education-based fitness intermittent teaching unit on high school students' cardiorespiratory fitness: a cluster-randomized controlled trial.

BACKGROUND: The aim of this study was to compare the effect of the intermittent and traditional physical fitness-based teaching units on cardiorespiratory fitness and physical activity levels in high school students during Physical Education sessions. METHODS: One hundred and three high school students (Mage=13.6±0.7) from six classes, balanced by grade, were cluster-randomly assigned into traditional (TG), intermittent (IG), and control (CG) groups. The TG performed a fitness teaching unit twice a week for nine weeks (35-40 minutes of the main part of each session). The IG worked during the first half of the sessions' main part (18-20 minutes) similarly to the TG, and during the second half they worked on technical-tactical aspects of invasion sports. Students' cardiorespiratory fitness was measured at the beginning and at the end of the teaching unit. Physical activity levels were measured objectively through a heart rate monitor and subjectively by a self-reported scale during Physical Education sessions. RESULTS: Both traditional and intermittent teaching units developed students' cardiorespiratory fitness levels (Δ post-pre-intervention: TG, M∆=19.8, SE=9.4; IG, M∆=16.6, SE=7.7); P<0.01). Additionally, both TG (M=86.2, SE=9.9) and IG (M=90.9, SE=7.6) had higher physical activity levels than the CG (M=76.3, SE=13.5) (P<0.05). However, no differences in physical activity levels were found between the IG and TG (P>0.05). CONCLUSIONS: The intermittent teaching unit allowed the simultaneous development of cardiorespiratory fitness and another curricular objective in the same Physical Education sessions.

Daily Step-Based Recommendations Related to Moderate-to-Vigorous Physical Activity and Sedentary Behavior in Adolescents.

Among adolescents empirical studies examining the total daily steps translation of the moderate-to-vigorous physical activity recommendation are scarce and inconsistent, and there are no previous studies with cadence-based steps and related to sedentary behavior. The main objective of the present study was to establish and compare the accuracy of daily step-based recommendations related to the moderate-to-vigorous physical activity and sedentary behavior thresholds in adolescents. The present study followed a cross-sectional design. A total of 126 adolescents (56 girls) aged 12-15 years old were assessed by ActiGraph GT3X accelerometers for eight consecutive days (moderate-to-vigorous physical activity, sedentary behavior, and steps) and the multistage 20-meter shuttle run test (cardiorespiratory fitness). ROC curve analyses showed that total daily steps (AUC = 0.94, 0.89-0.99; Threshold ≥ 11,111 steps/ day; P = 0.93; k = 0.67; p < 0.001) was a more appropriate indicator than cadence-based daily steps for distinguishing between physically active and inactive adolescents. Daily step-based thresholds represent a promising way to translate a total daily sedentary behavior threshold (e.g., total daily steps, AUC = 0.87, 0.81-0.93; Sensitivity = 0.87; Specificity = 0.70). Adolescents who met a favorable combination of step-based recommendations related to both physical activity and sedentary behavior thresholds had a higher probability of having a healthy cardiorespiratory fitness profile than those who did not meet either of them (e.g., risk ratio = 5.05, 1.69-15.08) or only the one related to physical activity (e.g., risk ratio = 4.09, 1.36-12.29). These findings may help policy-makers to provide accurate daily step-based recommendations that would simplify the physical activity and sedentary behavior thresholds for adolescents.

Influence of air pollution exposure on adolescents' objectively-measured physical activity and sedentary behavior.

Although regular physical activity is recommended for health, highly contaminated air exposure acts to the detriment of the benefits produced in individuals. The purpose of the present study was to compare the accelerometer-measured physical activity and sedentary behavior during the whole day, in-school time, out-of-school time, and school breaks between highly contaminated air days and non-highly contaminated air days in Chilean adolescents. Nineteen adolescents from Santiago of Chile were assessed by a GT3X accelerometer. The vertical axis and steps per minute for the whole day, and both of these variables together with the percentage of time of moderate-to-vigorous physical activity level in the out-of-school time period were higher in highly contaminated air days than in non-highly contaminated air days (p < 0.05; with effect sizes from r = 0.36 to r = 0.46). Results for sedentary behavior were similar in both conditions for every period of time analyzed. These results allow us to conclude the lack of awareness of the participants in this research regarding the health repercussions in relation to the physical activity performed during air pollution exposure. Some strategies in order to improve the Chilean adolescents' physical activity and sedentary behavior are suggested and discussed.

Influence of air pollution exposure on adolescents' objectively-measured physical activity and sedentary behavior / Influência da poluição do ar em adolescentes avaliando objetivamente a atividade física e o comportamento sedentário

Abstract Although regular physical activity is recommended for health, highly contaminated air exposure acts to the detriment of the benefits produced in individuals. The purpose of the present study was to compare the accelerometer-measured physical activity and sedentary behavior during the whole day, in-school time, out-of-school time, and school breaks between highly contaminated air days and non-highly contaminated air days in Chilean adolescents. Nineteen adolescents from Santiago of Chile were assessed by a GT3X accelerometer. The vertical axis and steps per minute for the whole day, and both of these variables together with the percentage of time of moderate-to-vigorous physical activity level in the out-of-school time period were higher in highly contaminated air days than in non-highly contaminated air days (p < 0.05; with effect sizes from r = 0.36 to r = 0.46). Results for sedentary behavior were similar in both conditions for every period of time analyzed. These results allow us to conclude the lack of awareness of the participants in this research regarding the health repercussions in relation to the physical activity performed during air pollution exposure. Some strategies in order to improve the Chilean adolescents' physical activity and sedentary behavior are suggested and discussed.

Resumo Embora a atividade física regular seja recomendada para saúde, a exposição de indivíduos ao ar altamente contaminado pode levar a perda dos benefícios produzidos. O propósito do presente estudo foi comparar o nível de atividade fisica e o comportamento sedentário durante e fora das aulas escolares, e nos recessos escolares entre dias altamente contaminados e dias não contaminados em adolescentes chilenos. Dezenove adolescentes de Santiago foram avaliados por um acelerômetro GT3X. O eixo vertical e os passos por minuto durante um dia inteiro, e as duas variáveis assim como a porcentagem de tempo de atividade fisica moderada a vigorosa no período do tempo fora da escola foi superior em dias altamente contaminados do que em dias não altamente contaminados (p < 0.05; r = 0.36 a r = 0.46). O resultado do comportamento sedentário foi similar em ambas as condições para cada período do tempo analisado. Esses resultados permitem concluir que a falta de consciência dos participantes nessa pesquisa relativa à repercussão na saúde com relação a atividade física executado durante exposição da poluição atmosférica. Algumas estratégias a fim de melhorar o nível de atividade fisica de adolescentes chilenos e comportamentos sedentários são sugeridas e discutidas.

Aprendizaje táctico en deportes de invasión en la educación física: influencia del nivel inicial de los estudiantes / Aprendizagem tática em esportes de invasão na educação física: influência do nível inicial de alunos / Tactical learning in invasion sports in physical education: influence of students' baseline level

El aprendizaje táctico objetivo en función del nivel inicial de los estudiantes. 85 estudiantes de 5º y 6º curso de educación primaria realizaron dos unidades didácticas de fútbol sala y baloncesto durante las clases de Educación Física. El grupo de control realizó las unidades didácticas siguiendo un enfoque tradicional técnico-táctico y el grupo experimental siguiendo un enfoque táctico. Los estudiantes del grupo experimental fueron divididos según la habilidad táctica inicial en baja (< P50) y alta (≥ P50). Antes y después de la intervención se evaluó la habilidad táctica objetiva en deportes de invasión. Los resultados mostraron que solo los estudiantes con bajo nivel inicial mejoraron significativamente su habilidad táctica en deportes de invasión tras un programa a corto plazo

O objetivo do presente estudo foi comparar o efeito de um programa de esportes de invasão durante as aulas de Educação Física sobre a aprendizagem tática objetiva em função de no nível inicial de alunos. 85 estudantes de 5º - 6º ano da educação primária fizeram duas unidades didáticas de futsal e basquete durante as aulas de Educação Física. O grupo de controle realizou as unidades didáticas seguindo uma abordagem técnico-tática tradicional e o grupo experimental seguindo uma abordagem tática. Os estudantes do grupo experimental foram divididos de acordo com a habilidade tática inicial em baixa (< P50) e alta (≥ P50). Antes e depois da intervenção, a habilidade tática objetiva em esportes de invasão foi avaliada. Os resultados mostraram que apenas estudantes com baixo nível inicial melhoraram significativamente sua habilidade tática em esportes de invasão após um programa de curto prazo

The purpose of the present study was to compare the effect of an invasion sports program during Physical Education lessons on objective tactical learning according to students' baseline skill level. Eighty-five students from 5th to 6th grade of primary education attended two teaching units of futsal and basketball during Physical Education lessons. The control group performed the teaching units following a traditional technicaltactical approach while the experimental group followed a tactical approach. Students in the experimental group were divided in low (< P50) and high (≥ P50) according to their baseline tactical skills. Objective tactical skills in invasion sports were assessed before and after the intervention. Results showed that only students with low baseline level significantly improved their tactical skills in invasion sports after a short-term program

Does school physical education really contribute to accelerometer-measured daily physical activity and non sedentary behaviour in high school students?

Physical education has been highlighted as an important environment for physical activity promotion, however, to our knowledge there are no previous studies examining the contribution of physical education to daily accelerometer-measured physical activity and non sedentary behaviour. The purpose was to compare the accelerometer-measured physical activity and sedentary behaviour between physical education, non-physical education and weekend days in adolescents. Of the 394 students from a Spanish high school that were invited to participate, 158 students (83 boys and 75 girls) aged 13-16 years were analyzed (wear time ≥ 600 min). Participants' physical activity and sedentary behaviour were objectively-measured by GT3X+ accelerometers during physical education (one session), non-physical education and weekend days. Results indicated that overall adolescents had statistically significant greater physical activity levels and lower values of sedentary behaviour on physical education days than on non-physical education and weekend days (e.g., moderate-to-vigorous physical activity = 71, 54 and 57 min; sedentary = 710, 740 and 723 min) (p < 0.05). Physical education contributes significantly to reducing students' daily physical inactivity and sedentary behaviour. Increasing the number of physical education classes seems to be an effective strategy to reduce the high current prevalence of physical inactivity and sedentary behaviour in adolescence.

The Spanish Adaptation of the Sport Motivation Scale-II in Adolescent Athletes.

The aim of this study was to adapt and validate the Spanish version of the Sport Motivation Scale-II (S-SMS-II) in adolescent athletes. The sample included 766 Spanish adolescents (263 females and 503 males; average age = 13.71 ± 1.30 years old). The methodological steps established by the International Test Commission were followed. Four measurement models were compared employing the maximum likelihood estimation (with six, five, three, and two factors). Then, factorial invariance analyses were conducted and the effect sizes were calculated. Finally, the reliability was calculated using Cronbach's alpha, omega, and average variance extracted coefficients. The five-factor S-SMS-II showed the best indices of fit (Cronbach's alpha .64 to .74; goodness of fit index .971, root mean square error of approximation .044, comparative fit index .966). Factorial invariance was also verified across gender and between sport-federated athletes and non-federated athletes. The proposed S-SMS-II is discussed according to previous validated versions (English, Portuguese, and Chinese).

[Not Available]. / Motivación hacia la Educación Física y su relación con la condición física saludable en escolares de Educación Secundaria Obligatoria.

Introducción: el aumento de la motivación hacia la Educación Física podría resultar un elemento esencial para propiciar un incremento en la condición física saludable de los escolares. La ausencia de estudios en población española hace necesario el desarrollo de esta línea de investigación.Objetivos: el objetivo del presente estudio fue examinar la asociación entre la motivación hacia la Educación Física y los niveles de condición física saludable en adolescentes de Educación Secundaria Obligatoria.Métodos: un total de 294 escolares (167 varones y 127 mujeres), de 13 a 16 años de edad cumplimentaron la versión española de la Escala de Locus Percibido de Causalidad en Educación Física y realizaron las pruebas de condición física saludable de la Batería ALPHA-Fitness de Alta Prioridad.Resultados: los resultados del estudio mostraron una asociación positiva entre tener una alta motivación hacia la Educación Física y presentar una mayor capacidad cardiorrespiratoria, tanto en niños como en niñas (p < 0,05). En cambio, no se encontró una asociación entre la motivación hacia la Educación Física y el sobrepeso o fuerza muscular.Conclusiones: existe una asociación positiva entre la motivación hacia la Educación Física y la capacidad cardiorrespiratoria. Por tanto, con el objetivo de que los alumnos presenten una capacidad cardiorespiratoria saludable, los profesores de Educación Física deberían promover la motivación hacia la Educación Física.

Motivación hacia la Educación Física y su relación con la condición física saludable en escolares de Educación Secundaria Obligatoria / Motivation toward Physical Education and its relationship with the health-related physical fitness in secondary education students

Introducción: el aumento de la motivación hacia la Educación Física podría resultar un elemento esencial para propiciar un incremento en la condición física saludable de los escolares. La ausencia de estudios en población española hace necesario el desarrollo de esta línea de investigación. Objetivos: el objetivo del presente estudio fue examinar la asociación entre la motivación hacia la Educación Física y los niveles de condición física saludable en adolescentes de Educación Secundaria Obligatoria. Métodos: un total de 294 escolares (167 varones y 127 mujeres), de 13 a 16 años de edad cumplimentaron la versión española de la Escala de Locus Percibido de Causalidad en Educación Física y realizaron las pruebas de condición física saludable de la Batería ALPHA-Fitness de Alta Prioridad. Resultados: los resultados del estudio mostraron una asociación positiva entre tener una alta motivación hacia la Educación Física y presentar una mayor capacidad cardiorrespiratoria, tanto en niños como en niñas (p< 0,05). En cambio, no se encontró una asociación entre la motivación hacia la Educación Física y el sobrepeso o fuerza muscular. Conclusiones: existe una asociación positiva entre la motivación hacia la Educación Física y la capacidad cardiorrespiratoria. Por tanto, con el objetivo de que los alumnos presenten una capacidad cardiorrespiratoria saludable, los profesores de Educación Física deberían promover la motivación hacia la Educación Física (AU)

Introduction: The increment of motivation toward Physical Education could be a crucial element increasing the health-related physical fitness in schoolchildren. The lack of studies in the Spanish population makes necessary the development of this research line. Objective: The objective of the present study was to examine the association between the motivation toward Physical Education and the health-related physical fitness levels in adolescents from secondary education. Methods: total of 294 adolescents (167 males and 127 females), from 13 to 16 years of age completed the Perceived Locus of Causality in Physical Education questionnaire and they performed the health-related physical fi tness tests of the ALPHA-Fitness Battery of High Priority. Results: The results of the study showed a positive association between having a high motivation toward Physical Education and having a higher cardiorespiratory fi tness, in both males and females (p< 0.05). However, no association between motivation toward Physical Education and overweight or muscular strength was found. Conclusions: There is a positive association between the motivation toward Physical Education and cardiorespiratory fitness. Therefore, with the purpose that students have health-enhancing cardiorespiratory fi tness levels, Physical Education teachers should promote the motivation toward Physical Education (AU)

Moderate-to-Vigorous Physical Activity Levels in Physical Education, School Recess, and After-School Time: Influence of Gender, Age, and Weight Status.

BACKGROUND: Primary and secondary school ages have been considered key moments to address the decrease of moderate-tovigorous physical activity (MVPA). Individual (eg, age, gender, and weight status) and contextual factors (moments of the day) need to be considered for a better explanation of the phenomenon. The quantity and quality of physical activity in Physical Education (PE), school recess (SR), and after school (AS) time need to be taken into account to solve the low levels of MVPA in youth. METHODS: A sample of adolescents (N = 231, 14.6 ± 1.2 years old) was studied using accelerometry to determine the objective MVPA level in PE, SR, and AS. RESULTS: Results indicated statistically significant differences on MVPA between contexts (AS > PE > SR, P < .001) as well as regarding the individual factors: age (older > younger in PE and younger > older in SR time; P < .001), gender (boys > girls in all contexts, P < .001), and weight status (overweight > nonoverweight in AS, P < .01). CONCLUSIONS: Because students did not meet the daily MVPA recommendations, some strategies have been provided in each of the contexts analyzed.

[Not Available]. / Composición factorial de una escala de autoeficacia en el cuidado de la alimentación y salud física en universitarios mexicanos.

Introducción: la autoeficacia es un importante factor mediador hacia cómo los individuos sienten, piensan, se motivan y se comportan. La expectativa de autoeficacia es un predictor importante de las intenciones y acciones de los individuos frente a diversas situaciones, siendo por tanto necesaria su medición. Objetivos: el presente estudio pretende indagar las propiedades psicométricas para una escala de autoeficacia en el cuidado de la alimentación y salud fisca, comprobando su estructura y su invarianza factorial. Métodos: la muestra se compuso de 1.313 estudiantes universitarios de las licenciaturas de Educación Física y Motricidad Humana que se imparten en la Universidad (omitido por anonimato), con una edad media de 20,46 años (± 1,87). La estructura factorial del cuestionario se analizó a través de análisis factoriales confirmatorios. Resultados: los análisis mostraron la adecuación de una estructura de cinco factores (ejercicio físico, cuidado de la alimentación, afrontamiento de problemas, evitación del consumo de tabaco y evitación del consumo de alcohol), mostrando adecuados índices de ajuste de fiabilidad (valores superiores a 0,85) y validez (GFI = 0,907; RMSEA = 0,053; CFI = 0,960), y explicando más del 70% de la varianza. Además, los resultados de los análisis factoriales llevados a cabo con dos submuestras indicaron fuertes evidencias de estabilidad de la estructura factorial (diferencia de CFI inferiores a 0,01). Conclusiones: la escala de autoeficacia en el cuidado de la alimentación y salud física es adecuada y puede usarse en estudios científicos. Futuras investigaciones deberían corroborar estos hallazgos.