Acta Gymnica - Ahead of Print

Upper body strength and power are associated with shot speed in men's ice hockey

Juraj Bežák, Vladimír Přidal

Acta Gymnica X:X | 10.5507/ag.2017.007

Background: Recent studies that addressed shot speed in ice hockey have focused on the relationship between shot speed and variables such as a player's skills or hockey stick construction and its properties. There has been a lack of evidence that considers the relationship between shot speed and player strength, particularly in players at the same skill level. Objective: The aim of this study was to identify the relationship between maximal puck velocity of two shot types (the wrist shot and the slap shot) and players' upper body strength and power. Methods: Twenty male professional and semi-professional ice hockey players (mean age 23.3 ± 2.4 years)...

Unilateral leg resistance training improves time to task failure of the contralateral untrained leg

Nosratollah Hedayatpour, Ali Golestani, Zahra Izanloo, Mina Meghdadi

Acta Gymnica X:X | 10.5507/ag.2017.008

Background: Cross-training is the process whereby training of one limb gives rise to enhancements in the performance of the opposite, untrained limb, most likely due to neural adaptations at the level of the motor cortex and/or spinal cord. Objective: To investigate whether unilateral resistance training can affect the ability of untrained homologous muscle in the contralateral limb to maintain force output over a sustained contraction. Methods: Fifteen healthy subjects completed 12 weeks of resistance training consisting of 36 sessions, using the unilateral leg press exercise. Sustained isometric knee extension performed at 50% of maximal force until...

Pubertal development, physical activity, and sedentary behavior among South Korean adolescents

Eun-Young Lee, Valerie Carson, John C. Spence

Acta Gymnica X:X | 10.5507/ag.2017.010

Background: Sex differences in physical activity (PA) and sedentary behavior (SB) are well-established. However, recent research suggested that variations in pubertal development may explain sex differences in PA and SB among adolescents. Objective: This study examined whether pubertal development mediates the relationship between sex and PA, and SB respectively. Methods: The 2012 Korea Youth Risk Behavior Web-based Survey included data from 74,186 students in grades 7 to 12 (mean age = 14.94 ± 1.8; 48.5% girls). Pubertal development was indicated by the year in which the student reported they had experienced menarche for...