Prognostic Power of Foot Mobility in Identifying the Risk of Musculoskeletal Injuries: A Cross-Sectional Study of Male Volleyball Players at Different Competitive Levels.

(1) Background: The arch structure and mobility of the foot are considered injury risk factors in volleyball. However, there are limited studies presenting differences in injury prevalence and the risk of lower limb injuries in relation to the competitive level in male volleyball. Therefore, the main aim of the current study was to evaluate foot mobility (through navicular drop test) as an injury risk factor in volleyball players from different competitive levels. (2) Methods: The reliability and usefulness of navicular drop testing were initially assessed in test-retest procedures (based on a sample of eight participants and 16 feet measurements), with primary analyses conducted using foot measurements of the twelve top-level volleyball players (24 feet) and eighteen academic-level volleyball players (36 feet). The modified navicular drop test was conducted, and the feet were classified based on arch height, and injury prevalence was retrospectively assessed with a previously validated questionnaire. Chi-squared tests, receiver operating curves, and logistic regression were used as statistical methods. The navicular drop test was verified as a reliable tool by intraclass correlation coefficient (ICC) (3.1) analysis. (3) Results: There were no significant differences in injury prevalence between academic- and top-level volleyball players, though there was a significant relationship between pronated foot and injury risk independent of competitive level. Generally, for both groups, thresholds above 10 mm of the navicular drop were predictors of lower limb injuries. The risk of injury if the foot was pronated ranged from 70% (academic level) to over 90% (top-level players). However, no statistically significant effect of competitive level on the chance of injury was observed. (4) Conclusions: Our study found a high prevalence of foot injuries independently of competitive level. There was a relationship between pronation of the foot and the risk of injury. However, the risk of lower limb injury was higher in pronated top-level players. Also, a navicular drop greater than 10 mm was an excellent predictor of injuries at both competitive levels.

The Functional Form of the Relationship between Body Height, Body Mass Index and Change of Direction Speed, Agility in Elite Female Basketball and Handball Players.

The aim of this study was to assess the functional form of the relationship between two anthropometric measurements-body height (BH) and body mass index (BMI)-and two motor abilities-change of direction speed (CODS) and agility (AG)-in female elite basketball and handball players. It was hypothesized that BH and BMI might be significantly associated with AG and CODS. Two scenarios of the Five-Time Shuttle Run to Gates test (planned and unplanned) were used to evaluate the CODS and AG. Two forms of models were built to assess functional forms of the relationships between CODS and AG vs. BH and BMI: simple linear regression and binomial curvilinear regression for each type of team sport. The results confirmed the relationships between both anthropometric measurements and motor abilities only in HB, whereas in BB only a significant relationship was noted between BH and AG. Moreover, two curvilinear functional forms of the relationship were identified: inverted L-shape and inverted U-shape. Therefore, it was concluded that the first form of function indicated an initially proportional relationship between anthropometric measurement and motor test results and plateau after reaching a certain value of the BH or BMI. Similarly, the second form of function indicated the peak value of the BH or BMI which is threshold for the value of the anthropometric measurement when a progressive effect in the functional feature occurs.

Acute Performance Enhancement Following Squats Combined With Elastic Bands on Short Sprint and Vertical Jump Height in Female Athletes.

ABSTRACT: Krcmár, M, Krcmárová, B, Bakalár, I, and Simonek, J. Acute performance enhancement after squats combined with elastic bands on short sprint and vertical jump height in female athletes. J Strength Cond Res 35(2): 318-324, 2021-The main purpose of this study was to compare back squats with and without elastic bands on sprint and vertical jump height. Fourteen female athletes (21.9 ± 2.3 years; 177.5 ± 6.36 cm; 66.2 ± 6.2 kg; 1 repetition maximum [1RM]/ body mass: 1.96 ± 0.14) agreed to participate. On 4 separate days, athletes walked freely for 5 minutes (CON), performed 3 sets of 4 repetitions at 85% of their 1RM with 20% or 30% (BAND20 or BAND30) of the total resistance originated from elastic bands, or performed 3 sets and 4 repetitions at 85% of their 1RM with an isoinertial load (ISO) before performance tests. Posttesting began 5 and 10 minutes after the last set of squats and included sprints over 3, 5, and 10-m, squat jump (SJ), and countermovement (CMJ) vertical jump height. The results of this study show that all postactivation performance enhancement (PAPE) protocols significantly improved 10-m sprint time (p < 0.05 to p < 0.01). Only BAND30 significantly improved 3-m and 5-m sprint times at both times of posttesting (p < 0.01). Comparison of PAPE protocols showed a significant difference when comparing BAND30 vs. ISO in SJ height in favor of BAND30 only when the best SJ height results from both posttesting times were selected (p < 0.01, g = 1.08). The results of this study suggest that all PAPE protocols were able to enhance short sprints and vertical jump height, but it seems that there is a greater trend to achieve better performance after performing the BAND30 protocol that can be seen by higher effect sizes achieved almost in all tests compared with the other PAPE protocols.

Multiple athletic performances, maturation, and Functional Movement Screen total and individual scores across different age categories in young soccer players.

The purpose of this study was to evaluate differences in multiple athletic performances, and to examine associations between athletic performance and Functional Movement Screen (FMS) in young soccer players. Forty-one soccer players were tested on peak height velocity (PHV), 5-, 10-, and 30-m sprint times, 505 change of direction (505 COD), Y-reactive agility tests, countermovement jump (CMJ), and squat jump (SJ) height. Significant main effects (P<0.01) were recorded in all tests except FMS total score whereas the U16 group outperformed U12 and U14 in almost each test. However, when the results were adjusted to the PHV 7 of 11 tests were nonsignificant. Significant associations were recorded between trunk stability push-up (TSPU) and 5 m (P=0.04) and 505 COD (preferred) times (P=0.01), and SJ height (P=0.03) in the U12. In the U14, significant associations were recoded between TSPU and SJ (P<0.01) and CMJ height (P=0.03). In the U16, significant associations were recorded between deep overhead squat and 5-m sprint time (P=0.02) and CMJ height (P=0.04). Results of this study indicate that athletic performance in young soccer players is multidimensional in nature, and it is a consequence of several factors including maturation, different training strategies, and movement proficiency.

Perceived Autonomy Support and Motivation in Young People: A Comparative Investigation of Physical Education and Leisure-Time in Four Countries.

Physical education focuses on the development of sports skills as well as fitness for health. In Central European countries there has been a shift in these focuses since the fall of Communism to follow internationally-recognised health-related physical activity recommendations, similar to Western European countries. In this study we investigated the extent to which motivation from school physical education transfers to leisure-time physical activity providing autonomy support by three social agents: school (physical education teachers), family and peers. Our study utilised the Aetological Approach (AA), Ecological Model (EM) and the Trans-Contextual Model (TCM) that consists of the Theory of Planned Behaviour (TPB) and the Self-Determination Theory (SDT) to explore how autonomous motivation is transferred between contexts (physical education, leisure-time and current behaviour). Nine-hundred and seventy-four students aged 11-18 (55% girls) participated in our study from four countries: Hungary, United Kingdom, Romania and Slovakia. A prospective research design was employed, and questionnaires were administered at three time points. Using 7-point Likert scales, attitude, usefulness, and affectiveness were measured. Furthermore, subjective norms and perceived behavioural control (PBC) were tested within TPB. Autonomous and controlling motivation were measured within SDT by administering the Behavioural Regulation in Exercise questionnaires (BREQ and BREQ-2). Finally, past physical activity, intention and current physical activity behaviours were tested. Results indicated that perceived autonomy support from family and friends predicted autonomous motivation towards leisure-time physical activity in all four countries. However, teachers' behaviour in some Eastern European countries did not predict this transfer. In general, in line with previous literature, boys reported more physical activity than girls. A strong influencing factor in the path model was that past behaviour predicted current behaviour, and according to that factor, boys reported being more active than girls.Boys also perceived more support from PE teachers than girls which was likely to have influenced their autonomous motivation in PE, which in turn transferred to leisure time. We discuss these results in the context of theories exploring the role of motivation and social environment on children's choices related to physical activity. In conclusion, we suggest providing more autonomy support, especially by schools, for the enhancement of autonomous motivation of young people to promote their leisure time physical activity.

Self-rated health, psychosocial functioning, andother dimensions of adolescent health in Centraland Eastern European adolescents

Background and Objectives: Although studied extensively among adults,self-rated health (SRH) has not received the same research attention among adolescents. Ithas been suggested that SRH in adolescents may be a function of adolescents’ overallsense of functioning and may reflect psychosocial functioning more so than in adults. Therating of health as poor by adolescents might be a somatic expression of life distress andmay be connected with risky behaviors. Therefore, the purpose of this study was to investigateself-rated health (SRH) in Central and Eastern European (CEE) adolescents and determineits association with psychosocial functioning and other dimensions of adolescenthealth.Methods: A survey was administered to 3,123 students in 34 secondary schools acrossCEE which included measures of SRH, psychosocial functioning (loneliness, hopelessness,shyness, perceptions of social status, self-rated happiness, and perception of physical (..) (AU)

Social normative perceptions of alcohol use and episodic heavy drinking among Central and Eastern European adolescents.

This study examined alcohol use and related social normative perceptions among a sample of 1,886 Central-Eastern European high school students. The youth represented in the study averaged 16.5 years of age and were from several localities in the countries of Hungary, Slovakia, Czech Republic, and Romania. Data for the study were collected through a school-based alcohol use survey that was completed in June 2005. Our results support the hypothesis that drinking was related to perception of the prevalence of alcohol use by schoolmates and by the number of friends who drink and/or engage in episodic heavy drinking. Specific implications of findings in terms of substance use prevention are discussed. In addition, the need for future research and the limitations of the current research are discussed. This study was largely financially supported through an international grant from the College of Health and Human Performance, Brigham Young University.

Cigarette smoking and indicators of psychosocial distress in Southeast Asian and Central-Eastern European adolescents.

The purpose of this study was to examine the association of cigarette smoking and 2 indicators of psychosocial distress (hopelessness and loneliness) among adolescents from 2 distinctly different regions of the world: Central-Eastern Europe (Hungary, Ukraine, Slovakia, Czech Republic, Romania, Poland) and Southeast Asia (Thailand, Taiwan, and the Philippines). Among Southeast Asian boys and girls, smokers had elevated hopelessness in comparison to nonsmokers but among Central-Eastern European students, this relationship was true only for girls and there was no relationship for boys. Across the country samples, there was only association of smoking with loneliness among Southeast Asian girls and Central-Eastern European girls. While Southeast Asian girls who smoked scored higher on loneliness than nonsmokers, the opposite was true among Central-Eastern European girls, with smokers scoring lower on loneliness.

Friendships and physical activity: investigating the connection in Central-Eastern European adolescents.

Studies investigating physical activity among adolescents living in post-communistic Central-European countries are sparse, particularly in light of the fact that some research has identified that adults in these countries exercise less frequently than western counterparts. The purpose of this study was to investigate whether physical activity participation is associated with certain friendship factors, the ability to make friends, level of involvement with friends, and perceived friends' involvement in physical activity, among 1,886 Central-Eastern European high schools students. The results of this study corroborated previous research in other adolescent populations in which it has been found that overall participation in physical activity was lowest among adolescents who said that making friends was difficult, who were less involved with friends, and who reported that making friends was difficult. The association of these friendship factors and physical activity participation has important implications for health education. Friendship factors should be given serious consideration in health education strategies and research efforts designed to increase youth physical activity.

Self-perception of body weight, weight management practices and goals, and other weight-related factors in central and eastern European adolescents.

Self-perception of body weight, management practices and goals, and other weight-related factors were assessed among a sample of 2,566 adolescents from 30 high schools in Hungary, Slovakia, Czech Republic, Romania, Ukraine, and Poland. Students who perceived themselves as much too fat were more likely than those with other weight perceptions to engage in weight management practices to lose weight, have higher body mass index, rate themselves lower on physical attractiveness, and estimate higher percentages of their same-sex friends as trying to lose weight. Similar to other research, boys and girls differed on self-perception of weight and other weight-related factors. Cross-cultural comparisons between central and eastern European adolescents and U.S. adolescents, as well as east and southeast Asian youth are made. Implications for health education practice are discussed.

Cigarette smoking, friendship factors, and social norm perceptions among central and Eastern European high school students.

Studies investigating smoking behavior among adolescents living in post-communistic Central-European countries are sparse. This study focused on the relationship between cigarette smoking, certain friendship factors, and social norm perceptions among 1,886 Central-Eastern European adolescents from high schools in Hungary, Slovakia, Czech Republic, and Romania. Smoking behavior was related to having friends who smoke, ease or difficulty making new friends, time spent with friends after school and during evenings, and estimations of the prevalence of smoking by schoolmates. Because these youth appear to overestimate the prevalence of smoking by schoolmates, the use of a norms-correction strategy may have potential merit in smoking prevention efforts targeting these adolescents. Smoking prevention and reduction are critical issues for Central-Eastern European youth because they appear to smoke cigarettes at a high rate.