Positive Impacts of a Sport Intervention on Male Students of Color and School Climate.

A positive school climate is strongly associated with enhanced student outcomes. With the disengagement of Black and Latinx youth living in poverty being at an all-time high, participation in sport-based youth development (SBYD) programs may enhance school climate, while capitalizing on existing interests. Purpose: The purpose of this study was to examine the impact of a SBYD intervention on male students of color and school climate. Method: Using a mixed-methods quasi-experimental design, 32 male students of color (11 Black, 13 Latinx, 8 two or more races) participated in an SBYD intervention, twice a week for a total of 20 weeks (Ages 10-14, M = 11.46). School climate data were gathered at the beginning and the end of the school year. Student, teacher, and administrator focus groups and interviews were also conducted at the end of the year. Results: A statistically significant interaction was found between students who participated in the intervention and those who did not participate in the intervention, on school climate measures F(1,74) = 15.00, p < .01, partial η2 = .17. Overall school climate scores were statistically significantly greater in the intervention group (F(1,74) = 19.22, p < .01, partial η2 = .20) at the end of the year. Focus group data also revealed themes of improved school connectedness, peer support, the acquisition of social/civic skills, and school engagement. Conclusions: A SBYD intervention may be a viable strategy to engage disconnected students and increase school climate perceptions, particularly among male students of color living in poverty.

The Relationship Between Physical Activity and Executive Functions Among Youth in Low-Income Urban Schools in the Northeast and Southwest United States.

The purpose of this study was to examine if physical activity is related to greater executive functions among youth in poverty. Executive functions (cognitive flexibility, inhibition, and working memory) and physical activity were measured in participants (N = 149) in the fifth to eighth grade from three schools located in high-poverty districts. Pearson correlations revealed a statistically significant correlation between physical activity and cognitive flexibility (r = .18, p < .05). Hierarchical multiple regressions revealed that physical activity significantly improved prediction for cognitive flexibility, R2 = .09, F(6, 142) = 2.26, p = .041, adjusted R2 = .05, above sex, maturity, and school district. A two-way multivariate analysis of covariance revealed statistically significant differences in working memory in more active youth compared with less active but no statistically significant differences in cognitive flexibility or inhibition (p < .05). Greater physical activity is associated with greater working memory among youth in poverty.

The role of strength and power during performance of high intensity military tasks under heavy load carriage.

OBJECTIVE: Previous research has investigated the physiological determinants of heavy load carriage while performing medium to long distance road marching, yet research examining the physiological underpinnings of high-intensity battlefield tasks is limited. This study sought to examine the role of strength and power during high-intensity combat tasks under heavy load carriage. METHODS: Eighteen recreationally trained men (mean±SD: age, 21±2 years; height, 172±6 cm; weight, 80±13 kg) participated in this study and performed an anaerobic combat course under 2 randomized experimental conditions; unloaded and loaded. Subjects performed 3 trials under each condition on separate days, with a 5-minute rest between each trial. In the unloaded trial, subjects wore a uniform with boots weighing approximately 3.2 kg. During the loaded trial, in addition to the uniform and boots, subjects wore Interceptor body armor (6.94 kg-9.10 kg) and a MOLLE rucksack weighing 30 kg. The course consisted of 3 consecutive tasks, which began from the prone position, led into a 30 m sprint, followed by a 27 m zigzag run, and ended with a 10 m casualty drag weighing approximately 79.4 kg. RESULTS: Pearson correlations showed significant (P≤.05) strong correlations between lower body strength (r=-0.63, -0.62), lower body power (r=-0.67, -0.67) and upper body strength (r=-0.60, -0.62) and overall performance times in the unloaded and loaded condition, respectively. CONCLUSION: Strength and power are strongly related to high-intensity military tasks with and without heavy load carriage.

The relationship between muscle action and repetition maximum on the squat and bench press in men and women.

The relationship between muscle action and fatigue is not well understood, especially in terms of potential sex-specific differences. The purpose of this investigation was to determine whether a different number of repetitions could be performed on the individual muscle actions of the bench press and squat in men and women. Ten resistance-trained men (n = 10; age, 25.2 ± 1.2 years; height, 178.6 ± 8.8 cm; weight, 91.4 ± 18.1 kg; body fat, 12.7 ± 3.6%) and women (n = 10; age, 25.4 ± 2.4 years; height, 164 ± 4.0 cm; weight, 58.45 ± 3.3 kg; body fat, 20.8 ± 1.5%) participated in this balanced and randomized within-group study. Using 85% of a 1 repetition maximum, over the course of 3 visits, subjects performed 1 eccentric (ECC), concentric (CON), or combined (COMB) set to failure on the squat and bench press. Differences in muscle action and sex-specific number of repetitions to failure were compared on the squat and bench press, where significance was p ≤ 0.05. Across both exercises and sex, we observed significant differences between each of the 3 muscle actions, where the number of repetitions decreased from ECC to COMB to CON. While no sex-specific differences were observed in the squat, women performed significantly more repetitions on the ECC and CON muscle actions of the bench press. Men performed more combined repetitions, however, indicating a greater reliance on the stretch-shortening cycle. Different muscle actions contribute uniquely to the successful performance of a lift and fatigue. These contributions appear to differ in men and women.