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1.
Medicina (Kaunas) ; 56(12)2020 Dec 21.
Artigo em Inglês | MEDLINE | ID: mdl-33371366

RESUMO

Background and objectives: Striking a balance between maximizing performance and preventing injury remains elusive in many professional sports. The purpose of this study was to assess the relative risk of non-contact injuries in professional basketball players based on predictive cut scores on the Functional Movement Screen™ (FMS). Materials and Methods: Thirty-two professional basketball players from the National Basketball Association (NBA) and Women's National Basketball Association (WNBA) participated in this study. This observational pilot cohort study assessed and scored each participant using the FMS during training camp. Each athlete was then tracked throughout the season while recording the number, type, and time lost due to injuries. Possible exposures, actual exposures, and exposures missed due to non-contact injury (NCI) for each athlete were calculated and then used to determine the crude and specific incident rates for exposures missed due to NCI per 1000 exposures. Results: Linear regression models were used to evaluate the predictive ability of the FMS score for total missed exposures, NCI, and CI missed exposures. In all models, the FMS total score failed to attain significance as a predictor (p > 0.05). FMS scores ranged from 5 to 18. The recommended cut score of 14 showed a sensitivity of 0.474 and a specificity of 0.750. The cut score of 15 showed the best combination, exhibiting a sensitivity of 0.579 and specificity of 0.625. A total of 5784 exposures to NCI were possible for the men and women combined, and 681 possible exposures were missed. Of these, 23.5% were due to NCI, 16.5% were due to contact injuries (CI), and 60% were due to illnesses and personal reasons. Conclusions: The FMS proved to be a measure that was not associated with any injury measure in this sample of professional basketball players, suggesting the instrument lacks predictive validity in this population.


Assuntos
Basquetebol , Atletas , Estudos de Coortes , Feminino , Humanos , Masculino , Movimento , Projetos Piloto
2.
Medicina (Kaunas) ; 56(9)2020 Aug 19.
Artigo em Inglês | MEDLINE | ID: mdl-32824955

RESUMO

Background and Objectives: National Collegiate Athletic Association (NCAA) soccer coaches implement numerous warm-up and flexibility strategies to prepare athletes for training and competition. The Fédération Internationale de Football Association (FIFA) developed the 11+ injury prevention program to reduce non-contact injuries. This study aimed to analyze the level of familiarity with and implementation of the evidence-based FIFA 11+ amongst NCAA Division I (DI) and Division III (DIII) men's and women's soccer coaches. Materials and Methods: NCAA soccer coaches in the United States received an Institutional Review Board-approved survey hyperlink. A total of 240 coaches completed the survey. The respondents represented 47.5% men's and 52.5% women's teams distributed within DI and DIII programs. Descriptive statistics are reported as frequency counts and mean ± standard deviation where applicable. Pearson's chi-square tests were performed to assess potential differences with a significance level set at α < 0.05. Results: The results indicated that approximately 62% of the respondents reported being familiar with the FIFA 11+ program. Of those coaches familiar with the program, 15.0% reported full implementation, 57.5% reported partial implementation, and 27.5% reported no implementation. Chi-square analyses revealed significant differences in FIFA 11+ implementation based upon division level (χ2 = 4.56, p = 0.033) and coaching certification levels (χ2 = 13.11, p = 0.011). Conclusions: This study indicates that there is a gap between FIFA 11+ knowledge and actual implementation. To reduce the risk of non-contact injury, there is a need to educate coaches and athletic trainers on the purpose of the FIFA 11+ program and how to perform the exercises correctly.


Assuntos
Fidelidade a Diretrizes , Guias como Assunto , Tutoria , Exercícios de Alongamento Muscular , Futebol/fisiologia , Exercício de Aquecimento , Traumatismos em Atletas/prevenção & controle , Certificação , Feminino , Humanos , Masculino , Tutoria/normas , Futebol/classificação , Futebol/lesões , Estados Unidos
3.
J Strength Cond Res ; 31(9): 2347-2354, 2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-25734784

RESUMO

Popp, JK, Bellar, DM, Hoover, DL, Craig, BW, Leitzelar, BN, Wanless, EA, and Judge, LW. Pre- and post-activity stretching practices of collegiate athletic trainers in the United States. J Strength Cond Res 31(9): 2347-2354, 2017-The aim of the study was to investigate the knowledge and practices of collegiate-certified athletic trainers (ATs) in the United States. Participants (n = 521) were provided an overview of the study and a hyperlink to a web-based survey. The "pre- and post-activity practices in athletic training questionnaire" consisted of demographic items and elements to measure knowledge and practices related to pre- and post-activity stretching routines. In previous studies, the survey demonstrated construct validity, α = 0.722. Pearson chi-square test was used to evaluate goodness of fit, and kappa was calculated to measure agreement between items. Only 32.2% of ATs recommended dynamic stretching (DS) to be performed pre-activity, whereas a larger percentage (42.2%) recommended a combination of static stretching (SS) and DS. Athletic trainers reported that only 28.0% of athletes are performing DS before activity. Conversely, 60.6% of collegiate ATs recommended SS postexercise, and 61.0% of athletes agree and perform after workout SS (κ = 0.761, p < 0.001). Collegiate ATs seem to underuse the current research evidence, which indicates that DS is more beneficial than SS when used pre-activity, and ATs continue to regularly incorporate SS in their pre-activity routines. However, there is evidence that collegiate ATs in the United States emphasize SS postactivity in a manner consistent with current research.


Assuntos
Atletas , Conhecimentos, Atitudes e Prática em Saúde , Exercícios de Alongamento Muscular/métodos , Universidades , Adulto , Distribuição de Qui-Quadrado , Estudos Transversais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Fatores Socioeconômicos , Esportes/educação , Estados Unidos
4.
Aging Male ; 19(3): 161-167, 2016 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-27558186

RESUMO

The purpose of the study was to examine the effects of acute androstenedione supplementation on hormone levels in older men at rest and during exercise. Men (n = 11) between the ages of 58 and 69 were divided into an experimental (n = 6; 62.33 ± 2.57 y) and control (n = 5; 60.2 ± 1.02 y) groups. Each participant received an oral 300 mg dose of either androstenedione (experimental) or a cellulose placebo (control) for 7 d. Pre- and post-supplementation participants completed two separate, 20-min strength tasks consisting of leg extension and leg curls at different percentages of their 10-RM. Researchers collected blood samples pre-, during, and post-exercise. Blood samples were analyzed for testosterone, androstenedione, and estradiol levels. The researchers found a significant difference between pre- (4.36 ± 56 ng/mL) and post- (5.51 ± 0.35 ng/mL) testosterone levels, as well as pre- (0.88 ± 0.20) and post- (7.46 ± 1.25) androstenedione levels, but no significant differences between pre- and post-estradiol levels for either group. It appears that short-term androstenedione supplementation augmented acute testosterone responses to resistance exercise in older men. However, further study of this supplement is needed to determine any potential it may have in mitigating andropause.


Assuntos
Androstenodiona/uso terapêutico , Suplementos Nutricionais , Testosterona/sangue , Idoso , Androstenodiona/administração & dosagem , Exercício Físico/fisiologia , Humanos , Masculino , Pessoa de Meia-Idade , Testosterona/deficiência
5.
J Strength Cond Res ; 30(2): 438-45, 2016 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-26813632

RESUMO

The purpose of this investigation was to determine the acute effects of heavy and light implements on subsequent overhead back (OHB) shot put performance with a competition weight shot put. This investigation was designed to test the efficacy of heavy implements for potentiating subsequent OHB performance. Participants included 41 athletes (20.9 ± 1.18 years.) from 2 National Collegiate Athletic Association Division I schools in the Midwestern United States (n = 23 male and n = 18 female). Mean distance for OHB throw with a competition shot put was examined after treatment (control, light shot put warm-up, and heavy shot put warm-up) through repeated-measures analysis of variance (ANOVA) with post hoc Bonferroni-corrected post hoc analysis. Responses after treatment on the 10-cm visual analog scale (VAS) fatigue were examined through repeated-measures ANOVA and demonstrated a significant main effect for treatment on VAS fatigue (F = 16.463; p = 0.001). The heavy shot put warm-up resulted in the greatest mean performance over the course of the 3 attempts (14.39 ± 1.82 m) followed by the light shot put warm-up (14.18 ± 1.68 m) and the control (14.15 ± 1.70 m). Results of the repeated-measures ANOVA demonstrated a significant main effect for treatment in regard to average distance (F = 6.276; p = 0.003). Post hoc testing suggested that the heavy shot put warm-up resulted in significantly better mean OHB performance than either the light shot put warm-up (t = 2.983; p = 0.0048; ES = 0.472; power = 0.901) or the control shot put warm-up (t = 3.349; p = 0.0018; effect size [ES] = 0.513; power = 0.939). Subsequent analysis examined the relationship between reported fatigue accrued during the overweight shot put warm-up and the change in performance on the OHB throw when compared to the control condition. Analysis revealed that subjects who reported higher levels of VAS fatigue did not perform as well after the overweight treatment (p = 0.0274).


Assuntos
Desempenho Atlético/fisiologia , Músculo Esquelético/fisiologia , Condicionamento Físico Humano/métodos , Adolescente , Adulto , Feminino , Humanos , Masculino , Fadiga Muscular/fisiologia , Escala Visual Analógica , Adulto Jovem
6.
J Strength Cond Res ; 30(9): 2399-405, 2016 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-26881803

RESUMO

Judge, LW, Urbina, LJ, Hoover, DL, Craig, BW, Judge, LM, Leitzelar, BM, Pearson, DR, Holtzclaw, KA, and Bellar, DM. The impact of competitive trait anxiety on collegiate powerlifting performance. J Strength Cond Res 30(9): 2399-2405, 2016-The purpose of this study was to determine the relationship between competitive trait anxiety measures and powerlifting (PL) performance. Thirty-six collegiate powerlifters on club teams from 3 universities were recruited during a competition (men = 26, women = 10; age = 19.9 ± 1.5 years; height = 172.5 ± 8.6 cm; weight = 81.4 ± 21.0 kg). The athletes were distributed across weight classes for collegiate PL (47.6 kg: 1; 51.7 kg: 1; 54.9 kg: 1; 59.8 kg: 3; 67.1 kg: 2; 74.8 kg: 7; 82.1 kg: 4; 89.8 kg: 9; 99.8 kg: 5; super heavyweight: 3). A survey containing questions about PL performance history and the 15-item Sport Competition Anxiety Test (SCAT) were administered to the participants before competing. The SCAT total was negatively correlated (r = -0.397; p = 0.02) to the athletes' percentage of best total achieved in the competition (actual performance total/best comp total × 100). Of the individual lifts, the SCAT score was negatively correlated to the personal best for bench press (r = -0.368; p = 0.03) and deadlift (r = -0.317, p = 0.05), but did not significantly correlate for squat (r = -0.182, p = 0.27). These results indicate a negative correlation between the SCAT score and athletes' personal best totals in PL. Increased SCAT scores were associated with decreased personal best PL totals. The results suggest that competitive trait anxiety may have negatively impacted performance and that some PL athletes may benefit from interventions aimed at decreasing anxiety before and during performance.


Assuntos
Ansiedade/psicologia , Desempenho Atlético/psicologia , Levantamento de Peso/psicologia , Adolescente , Adulto , Peso Corporal , Feminino , Humanos , Masculino , Esportes , Inquéritos e Questionários , Universidades , Adulto Jovem
7.
J Strength Cond Res ; 30(11): 2972-2978, 2016 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-26950346

RESUMO

Judge, LW, Kumley, RF, Bellar, DM, Pike, KL, Pierson, EE, Weidner, T, Pearson, D, and Friesen, CA. Hydration and fluid replacement knowledge, attitudes, barriers, and behaviors of NCAA Division 1 American football players. J Strength Cond Res 30(11): 2972-2978, 2016-Hydration is an important part of athletic performance, and understanding athletes' hydration knowledge, attitudes, barriers, and behaviors is critical for sport practitioners. The aim of this study was to assess National Collegiate Athletic Association (NCAA) Division 1 (D1) American football players, with regard to hydration and fluid intake before, during, and after exercise, and to apply this assessment to their overall hydration practice. The sample consisted of 100 student-athletes from 2 different NCAA D1 universities, who participated in voluntary summer football conditioning. Participants completed a survey to identify the fluid and hydration knowledge, attitudes and behaviors, demographic data, primary football position, previous nutrition education, and barriers to adequate fluid consumption. The average Hydration Knowledge Score (HKS) for the participants in the present study was 11.8 ± 1.9 (69.4% correct), with scores ranging from 42 to 100% correct. Four key misunderstandings regarding hydration, specifically related to intervals of hydration habits among the study subjects, were revealed. Only 24% of the players reported drinking enough fluids before, during, immediately after, and 2 hours after practice. Generalized linear model analysis predicted the outcome variable HKS (χ = 28.001, p = 0.045), with nutrition education (Wald χ = 8.250, p = 0.041) and position on the football team (χ = 9.361, p = 0.025) being significant predictors. "Backs" (e.g., quarterbacks, running backs, and defensive backs) demonstrated significantly higher hydration knowledge than "Linemen" (p = 0.014). Findings indicated that if changes are not made to increase hydration awareness levels among football teams, serious health consequences, including potential fatalities, could occur on the field, especially among heavier linemen.


Assuntos
Atletas/psicologia , Comportamento de Ingestão de Líquido , Ingestão de Líquidos , Futebol Americano/psicologia , Conhecimentos, Atitudes e Prática em Saúde , Adolescente , Desempenho Atlético , Humanos , Masculino , Estudantes , Inquéritos e Questionários , Estados Unidos , Universidades/organização & administração , Adulto Jovem
8.
J Strength Cond Res ; 29(5): 1433-8, 2015 May.
Artigo em Inglês | MEDLINE | ID: mdl-25909961

RESUMO

The ability to use data from tests of maximum aerobic capacity to estimate the ventilatory threshold and point of respiratory compensation (RCP) is useful for coaches and practitioners in the development of training schemes. Current methods for determining the RCP generally involve identifying deflections in respiratory variables when examined alongside minute ventilation. This investigation describes a novel mathematical method for determining RCP using standard scores (Z-scores) for minute ventilation (VE) and oxygen consumption (VO2). This method allows for the point where ventilation becomes disproportionate to oxygen consumption to be quantified as an intersection between 2 lines of best fit. This novel Z-score method was compared with a well-described determination of RCP and was found to be highly correlated (r = 0.926, p ≤ 0.001). The Z-score method was also found to be related to 10-km road race performance using regression analysis (R(2) = 0.824, p ≤ 0.001) in a group of 18 athletes and recreational runners. Based on the evidence from this study, the Z-score method of RCP determination is highly correlated to previous methods and endurance performance. This method potentially offers further benefits as it is not reliant on visual determination of changes in slope in variables of interest but rather on the mathematical solution to the intersection of 2 regression lines.


Assuntos
Limiar Anaeróbio , Conceitos Matemáticos , Ventilação Pulmonar , Fenômenos Fisiológicos Respiratórios , Adolescente , Adulto , Desempenho Atlético/fisiologia , Teste de Esforço , Feminino , Humanos , Masculino , Valor Preditivo dos Testes , Corrida/fisiologia , Adulto Jovem
9.
J Strength Cond Res ; 29(7): 2034-40, 2015 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-25559910

RESUMO

The purpose of this study was to analyze the level of creatine use along with the perceived benefits and barriers of creatine use among collegiate athletes who participate in throwing events within the sport of track and field. A total of 258 throwers from National Collegiate Athletic Association Division I institutions completed an online survey regarding creatine. The results provided baseline levels of creatine use and allowed for the analysis of factors related to athletic conference affiliation. Results indicate that creatine use remains to be a common (32.7%) practice among throwers with significantly higher levels of use among Football Bowl Subdivision (FBS) conference athletes (44.6%) than Football Championship Subdivision (FCS) conference athletes (28.8%), χ² = 5.505, p = 0.019. The most common reasons for using creatine included a desire to improve/increase: strength (83.3%), recovery time (69.0%), and performance (60.7%). The most common perceived obstacles included contamination/quality control (39.5%), cost (33.3%), inconvenience (16.7%), and cramping (14.3%). A desire for additional education and training was noted through an expression of interest (55.6%) with significantly higher levels of interest from FBS athletes (65.6%) than FCS athletes (52.2%), χ² = 6.425, p = 0.039. However, the athletic departments provide nutritional supplement counseling at only 26.6% of the schools. Although the access to full-time nutritionist counsel was available at 57.3% of the schools, there was a significant difference (χ² = 9.096, p = 0.003) between FBS schools (73.7%) and FCS schools (51.7%).


Assuntos
Informação de Saúde ao Consumidor , Creatina , Suplementos Nutricionais , Uso de Medicamentos/estatística & dados numéricos , Substâncias para Melhoria do Desempenho , Atletismo/estatística & dados numéricos , Adolescente , Creatina/efeitos adversos , Suplementos Nutricionais/efeitos adversos , Feminino , Humanos , Masculino , Substâncias para Melhoria do Desempenho/efeitos adversos , Inquéritos e Questionários , Estados Unidos , Universidades , Adulto Jovem
10.
J Strength Cond Res ; 28(5): 1255-62, 2014 May.
Artigo em Inglês | MEDLINE | ID: mdl-24552803

RESUMO

The purpose of this investigation was to examine the effects of a personal oxygen supplement (OS) on performance during exhaustive exercise, respiratory responses during exhaustive exercise, and cognitive function after exhaustive exercise. The participants for this blind placebo-controlled experiment were apparently healthy college-aged adults (n = 20). First, VO2max was assessed (47.6 ± 9.8 ml O2·kg(-1)·min(-1)). Participants then ran 2 trials at 80% of VO2max speed to exhaustion and received either a placebo (compressed air) or personal OS. Psychomotor vigilance testing (PVT) was performed before and after each trial. Performance between treatments was evaluated through repeated measures analysis of variance (ANOVA) and was not found to be different (p = 0.335, ηp2 = 0.052), and order (placebo first or personal OS first) was not significant within the model (p = 0.305, ηp2 = 0.058). Mean times were 1,057.6 ± 619.8 seconds for the oxygen trials and 992.5 ± 463.1 seconds for the placebo trials. Repeated measures ANOVAs were used to assess minute ventilation (Ve, L·min(-1)) and VCO2 (L·O2·min(-1)) during exercise and recovery, mean heart rate during recovery, and PVT results. Treatment was nonsignificant (p > 0.05) nor were any interaction effects (treatment × time, p > 0.05) for any variables. The results of this study suggest that a personal OS had no effect on performance and did not affect ventilation even at the time directly surrounding the application. The results of the study also suggest that personal OS do not enhance exercise recovery or cognition during exercise recovery.


Assuntos
Desempenho Atlético/fisiologia , Cognição/fisiologia , Fadiga/fisiopatologia , Oxigênio/administração & dosagem , Resistência Física/fisiologia , Adulto , Feminino , Frequência Cardíaca , Humanos , Perna (Membro) , Masculino , Mialgia , Consumo de Oxigênio , Esforço Físico , Desempenho Psicomotor/fisiologia , Ventilação Pulmonar , Corrida/fisiologia , Método Simples-Cego , Adulto Jovem
11.
J Strength Cond Res ; 28(8): 2253-61, 2014 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-24476770

RESUMO

Strength and conditioning training programs are essential components of athletic performance, and the effectiveness of these programs can be linked to the strength and conditioning facilities (SCFs) used by athletes. The primary purpose of this study was to provide a statistical overview of National Collegiate Athletic Association (NCAA) Division I SCFs, equipment and maintenance budget, and the relationship between SCF budget and staffing space, and equipment. The secondary purpose was to note differences in SCFs between those schools with and without football programs. An 84-item online survey instrument, developed with expert input from certified strength professionals, was used to collect data regarding the SCFs in NCAA Division I universities. A total of 110 valid and complete surveys were returned for a response rate of 38.6%. Results of Pearson's χ2 analysis demonstrated that the larger reported annual equipment budgets were associated with larger SCFs (χ2 = 451.4, p ≤ 0.001), greater maximum safe capacity of athletes using the facility (χ2 = 366.9, p ≤ 0.001), increased numbers of full-time coaches (χ2 = 224.2, p ≤ 0.001), and increased number of graduate assistant or intern coaches (χ2 = 102.9, p ≤ 0.001). Based on these data, it can be suggested to athletic administrators and strength and conditioning professionals at the collegiate level that budgets need to be re-evaluated as the number of personnel available to monitor student-athletes and the size and safe capacity of the facility are related to the ability of the strength and conditioning staff to safely and adequately perform their duties.


Assuntos
Academias de Ginástica , Futebol Americano , Condicionamento Físico Humano , Treinamento Resistido , Equipamentos Esportivos , Universidades , Academias de Ginástica/economia , Academias de Ginástica/estatística & dados numéricos , Futebol Americano/classificação , Futebol Americano/economia , Futebol Americano/estatística & dados numéricos , Humanos , Decoração de Interiores e Mobiliário/economia , Condicionamento Físico Humano/economia , Condicionamento Físico Humano/instrumentação , Treinamento Resistido/instrumentação , Equipamentos Esportivos/economia , Equipamentos Esportivos/estatística & dados numéricos , Estados Unidos , Universidades/classificação , Universidades/economia , Universidades/estatística & dados numéricos , Recursos Humanos
12.
J Strength Cond Res ; 27(9): 2626-33, 2013 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-22505129

RESUMO

The rapid growth and expanding use of high school strength and conditioning facilities (SCFs) creates a need to research and better understand these vital facilities. This study was designed to examine SCFs at the high school level including facility size, equipment, leadership/staffing, and safety. A 70-item online survey instrument, developed with expert input from certified strength professionals, was used to collect data regarding the SCFs in high schools throughout a midwestern state, and was distributed via email to a total of 390 high school athletic directors. Survey respondents (n = 108) all reported the presence of SCFs with 95.4% indicating a dedicated SCF space. A strong positive correlation (r = 0.610, p ≤ 0.001) was determined between the variables of SCF size in square feet and school size measured by total enrollment. Analysis of variance and χ² analyses revealed significant differences in equipment, facility size, and safety factors based on the categorical variables of school size and the presence of certified strength and conditioning specialist (CSCS) leadership. It appears the CSCS's application of their scientific knowledge goes beyond training athletes for the goal of improving athletic performance to actually influence the SCF itself. Athletic administrators at the high school level need to recognize the impact CSCS program leadership can have on the overall quality of the strength and conditioning program and facility.


Assuntos
Educação Física e Treinamento/normas , Segurança/normas , Instituições Acadêmicas/normas , Certificação , Coleta de Dados , Humanos , Meio-Oeste dos Estados Unidos , Educação Física e Treinamento/estatística & dados numéricos , Treinamento Resistido/instrumentação , Treinamento Resistido/normas , Treinamento Resistido/estatística & dados numéricos , Segurança/estatística & dados numéricos , Instituições Acadêmicas/estatística & dados numéricos , Esportes/educação , Esportes/normas , Esportes/estatística & dados numéricos , Equipamentos Esportivos/normas , Equipamentos Esportivos/estatística & dados numéricos
13.
J Strength Cond Res ; 27(10): 2691-9, 2013 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-23254548

RESUMO

The purpose of this study is to determine the pre- and postactivity stretching practices of Division I, II, and III track and field throws programs. A 33-item survey instrument was developed to collect data regarding the warm-up and flexibility practices at the National Collegiate Athletic Association (NCAA) Division I (n = 320), Division II (n = 175), and Division III (n = 275) universities. A total of 135 surveys were completed for a 17.5% return rate, and although the response rate was generally low, it did mirror the distribution percentages of the 3 divisions. Significant differences were found for the level of United States Track and Field (USATF) certification and the use of static stretching (SS) between throws (χ = 6.333, p = 0.048). Significance was also found for the USATF certification level and athletic trainer (AT) assistance in performing SS (χ = 13.598, p = 0.01). Significant differences were also found for the NCAA division levels and the use of soft tissue mobilization (χ = 5.913, p = 0.026). Although research supports dynamic warm-up/stretching over other forms of preactivity protocols, it seems that some track-and-field throws coaches are reluctant to completely discontinue preactivity SS. The results of this study suggest that it is necessary for track and field throws coaches to reevaluate their own practices, perhaps better aligning them with current research findings.


Assuntos
Braço/fisiologia , Exercícios de Alongamento Muscular/métodos , Atletismo/fisiologia , Coleta de Dados , Humanos , Masculino , Estados Unidos , Universidades , Adulto Jovem
14.
J Strength Cond Res ; 27(9): 2456-64, 2013 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-22505134

RESUMO

This study sought to determine the effectiveness of coach certification courses in promoting proper preactivity and postactivity stretching practices in National Collegiate Athletic Association (NCAA) Division I, II, and III crosscountry programs. Distribution of questionnaires to 770 NCAA Division I, Division II, and Division III programs in the U.S.A. resulted in 111 coaches (88 [78.2%] men and 25 [21.8%] women) participating. Chi-square analyses revealed that noncertified coaches reported significantly greater (χ² = 21.582, p = 0.0174) usage of static stretching alone as their preactivity modality (18.9%, n = 9) vs. their certified counterparts (1.8%, n = 1). In addition, certified coaches reported a higher usage of dynamic flexibility only during the preactivity period (47.4%, n = 27) vs. their noncertified peers (32.4%, n = 16). Coaches were also asked if they allowed for static stretching between interval work and events in track and field, and a significantly higher percentage (χ² = 11.948, p = 0.0177) of noncertified coaches (45.5%, n = 23) reported allowing the athletes to perform static stretches between intervals at practice than certified peers (37.9%, n = 22). These significant differences help demonstrate that coaching certification courses are an effective tool for communicating current information about stretching practices. However, the results also revealed that there are still many certified coaches who are not implementing best practices in preactivity routines.


Assuntos
Exercícios de Alongamento Muscular/métodos , Atletismo/fisiologia , Adulto , Coleta de Dados , Feminino , Humanos , Masculino , Exercícios de Alongamento Muscular/normas , Atletismo/educação , Atletismo/normas , Estados Unidos , Universidades
15.
Int J Exerc Sci ; 16(5): 458-468, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37122762

RESUMO

Exercise stimulates the production and secretion of testosterone, cortisol, and brain-derived neurotrophic factor (BDNF) and affects cognitive performance. However, the interaction of these variables is unknown. To investigate these interactions, 21 college-aged men completed two work-matched exercise protocols: continuous (CONT) exercise and an interval protocol (INT). Blood and saliva samples were collected before and after exercise to quantify BDNF, cortisol, and testosterone. Participants completed a battery of cognitive assessments after exercise. A MANOVA analysis of condition demonstrated that no domains were significantly different after CONT and INT (p > 0.05). A repeated measures ANOVA of time by condition demonstrated increases in BDNF in after both CONT and INT (p = 0.05), elevated cortisol after CONT (p = 0.05), and an interaction of testosterone (p = 0.027). Work matched continuous and interval exercise appears to promote serum BDNF but do not result in different post exercise cognitive performance.

16.
Eur J Appl Physiol ; 112(2): 795-800, 2012 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-21671101

RESUMO

We sought to determine if cold acclimatized men display higher economy (i.e. lower oxygen consumption at a given workload) during graded cycle ergometry in the cold (5°C). After completing a familiarization trial 1 week prior, five cold weather athletes (CWA) and eight physically active men (NON) underwent graded exercise tests to volitional fatigue in 5°C. The protocol always started at 60 W and increased by 20 W each minute. Oxygen consumption (VO(2)), respiration rate (RR), tidal volume (TV), and respiratory exchange ratio (RER) were determined via open circuit spirometry. Individuals were matched for body size and minutes of weekly physical activity. Repeated measures analyses of variance were conducted across time (workload) and cold acclimatization was entered as a between subjects factor. VO(2) peak was not different between groups but CWA had lower VO(2) at 60 and 240 W. CWA also had lower RR at 180 and 260 W as well as lower RER at 240 and 260 W. At submaximal workloads, cold acclimatized men have higher exercise economy than non-acclimatized men. This could have implications for those who work in this context.


Assuntos
Aclimatação/fisiologia , Temperatura Baixa , Metabolismo Energético/fisiologia , Consumo de Oxigênio/fisiologia , Esforço Físico/fisiologia , Mecânica Respiratória/fisiologia , Humanos , Masculino , Adulto Jovem
17.
J Strength Cond Res ; 26(3): 844-50, 2012 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-22293680

RESUMO

Low-dose caffeine administered in chewing gum does not enhance cycling to exhaustion. The purpose of the current investigation was to examine the effect of low-dose caffeine (CAF) administered in chewing gum at 3 different time points during submaximal cycling exercise to exhaustion. Eight college-aged (26 ± 4 years), physically active (45.5 ± 5.7 ml·kg(-1)·min(-1)) volunteers participated in 4 experimental trials. Two pieces of caffeinated chewing gum (100 mg per piece, total quantity of 200 mg) were administered in a double-blind manner at 1 of 3 time points (-35, -5, and +15 minutes) with placebo at the other 2 points and at all 3 points in the control trial. The participants cycled at 85% of maximal oxygen consumption until volitional fatigue and time to exhaustion (TTE) were recorded in minutes. Venous blood samples were obtained at -40, -10, and immediately postexercise and analyzed for serum-free fatty acid and plasma catecholamine concentrations. Oxygen consumption, respiratory exchange ratio, heart rate, glucose, lactate, ratings of perceived exertion, and perceived leg pain measures were obtained at baseline and every 10 minutes during cycling. The results showed that there were no significant differences between the trials for any of the parameters measured including TTE. These findings suggest that low-dose CAF administered in chewing gum has no effect on TTE during cycling in recreational athletes and is, therefore, not recommended.


Assuntos
Ciclismo/fisiologia , Cafeína/farmacologia , Goma de Mascar , Fadiga Muscular/efeitos dos fármacos , Adulto , Desempenho Atlético/fisiologia , Glicemia/análise , Cafeína/administração & dosagem , Método Duplo-Cego , Epinefrina/sangue , Frequência Cardíaca/efeitos dos fármacos , Frequência Cardíaca/fisiologia , Humanos , Ácido Láctico/sangue , Masculino , Norepinefrina/sangue , Consumo de Oxigênio/efeitos dos fármacos , Consumo de Oxigênio/fisiologia , Resistência Física/efeitos dos fármacos , Resistência Física/fisiologia
18.
Eur J Appl Physiol ; 111(6): 979-87, 2011 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-21082195

RESUMO

Military and factory work often involves exposure to cold temperatures. With prolonged exposure, individuals report feeling cold and develop pain in their hands, both of which might be alleviated by endogenous heat production via exercise. The purpose of this study was to evaluate how interval (INT) and continuous (CONT) cycle ergometry alter thermal sensation, hand pain, mean finger temperature, and skin surface temperature gradient (forearm-finger) following immobility in moderate cold. Fourteen young men underwent two trials (each was three total hours in 5°C) consisting of a 90-min period of acute cold exposure (ACE), 30 min of exercise (INT or CONT), and a 60-min recovery period (REC). INT and CONT were isoenergetic, reflecting 50 ± 1% of each individual's VO(2) peak. All perceptual scales were significantly correlated during ACE (i.e., test-retest reliability). As expected, individuals felt colder and reported more hand pain during ACE, as compared to thermoneutral conditions. Relative to ACE, both INT and CONT increased mean finger temperature, which was associated with warmer thermal sensation and less hand pain. During REC in 5°C, individuals felt colder and reported more hand pain than during exercise. Although there were no perceptual differences between INT and CONT, moderate exercise in general can cause subjective feelings of warmth and less hand pain in people acutely exposed to moderate cold.


Assuntos
Temperatura Baixa , Exercício Físico/fisiologia , Percepção da Dor/fisiologia , Sensação Térmica/fisiologia , Adulto , Teste de Esforço/métodos , Humanos , Masculino , Recuperação de Função Fisiológica/fisiologia , Fatores de Tempo , Adulto Jovem
19.
J Strength Cond Res ; 25(2): 459-63, 2011 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-20512067

RESUMO

The present study investigated the effects of training combining elastic tension, free weights, and the bench press. Eleven college-aged men (untrained) in the bench press participated in the 13-week study. The participants were first given instructions and then practiced the bench press, followed by a one-repetition maximum (1RM) test of baseline strength. Subjects were then trained in the bench press for 3 weeks to allow for the beginning of neural adaptation. After another 1RM test, participants were assigned to 1 of 2 conditions for the next 3 weeks of training: 85% Free-Weight Tension, 15% Elastic Tension (BAND), or 100% Free-Weight Tension (STAND). After 3 weeks of training and a third 1RM max test, participants switched treatments, under which they completed the final 3 weeks of training and the fourth 1RM test. Analysis via analysis of covariance revealed a significant (p ≤ 0.05) main effect for time and interaction effect for Treatment (BAND vs. STAND). Subsequent analysis via paired-samples t-test revealed the BAND condition was significantly better (p = 0.05) at producing raw gains in 1RM strength. (BAND 9.95 ± 3.7 kg vs. STAND 7.56 ± 2.8 kg). These results suggest that the addition of elastic tension to the bench press may be an effective method of increasing strength.


Assuntos
Força Muscular/fisiologia , Esforço Físico/fisiologia , Treinamento Resistido/métodos , Levantamento de Peso/fisiologia , Adulto , Estatura , Peso Corporal , Estudos de Coortes , Humanos , Masculino , Músculo Esquelético/fisiologia , Resistência Física/fisiologia , Extremidade Superior/fisiologia , Suporte de Carga , Adulto Jovem
20.
Int J Exerc Sci ; 14(6): 578-593, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34055175

RESUMO

Despite the continued growth of the Olympic Games (OG), the Youth Olympic Games (YOG) has received minimal attention from mainstream media since its introduction in 2010. The purpose of this study was to examine and compare event awareness and consumption intention for the 2012 Winter YOG to two international sport events occurring in the same year. A survey instrument was utilized to examine and compare event awareness, consumption intention, and logo identification for three international sport events within a millennial generation sample. The study showed significant differences in personal and public awareness between the three sport events, with personal (r = .313, p ≤ .001) and public (r = .331, p ≤ .001) awareness for the YOG demonstrating a positive correlation with consumption intention. This study is an important assessment of the YOG event awareness that can be utilized by the International Olympic Committee (IOC) to better understand and engage their participants and audience. Successful promotion of the YOG may require a transformation of the current marketing strategies that are utilized. The YOG has great opportunity for success in the global sport market to leave behind the status of the best kept secret in sport.

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