Effects of Different Types of Muscle Contraction on Single Bout and Repeated Power Performance

• Main Authors: Yu-syuan Zeng, 曾昱軒
• Other Authors: Jen-Yu Ho
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/35256291585504012480

碩士 === 國立臺灣師範大學 === 運動科學研究所 === 102 === Background: Previous research has demonstrated that high-intensity resistance exercise can enhance subsequent power performance. This phenomenon is referred to post-activation potentiation (PAP). Most studies have either examined the effects of different types of muscle contraction of resistance exercise (PAP exercise) on only one power performance, or the effects of the same type of muscle contraction PAP exercise on different types of power performance. However, no study has yet to investigate the interactions between different type of muscle contraction PAP exercise and different types of power performance. Purpose: To examine the effects of different types of muscle contraction PAP exercise on single bout and repeated power performance at different recovery times. Methods: Twelve resistance-trained males (22.7 ± 2.1, age) were recruited and performed 5 seconds of isometric maximal voluntary contraction squat or dynamic squat (3 × 90% 1RM) on smith machine using repeated measures and counterbalance designs. Participants performed 40 meters sprint or horizontal jump before and 8 and 18.5 minutes after PAP exercise. Jump distance and sprint time were recorded and assessed. A two-way repeated-measures ANOVA (contraction × time) was used to determine the differences in single bout or repeated power performance under difference types of muscle contraction PAP exercise at difference recovery times. In addition, data obtained from the single bout and repeated power performance were converted to standard scores (Z-score). A two-way repeated-measures ANOVA (power performance × time) was used to determine differences between single bout and repeated power performance after dynamic or isometric PAP exercise. A significance level was set at p ≤ .05. Results: After isometric PAP exercise, significant increases in single bout (horizontal jump) power performance were observed at 18.5 minutes (18.5 mins vs. pre-test, 252.67 ± 5.42 vs. 249.08 ± 5.37 cm, p < .05). After dynamic PAP exercise, significant increases in repeated (40 meters) power performance were observed at 18.5 minutes (18.5 mins vs. pre-test, 0.19 ± 1.05 vs. -0.04 ± 1.01, p < .05). Conclusion: While dynamic PAP exercise may have greater benefits on repeated power performance, isometric PAP exercise may have greater benefits on single bout power performance.