| Summary: | 碩士 === 臺北市立大學 === 運動器材科技研究所碩士在職專班 === 104 === This article intends to find out whether, especially for young rugby players, the performance of the vertical jump and sprint can be improved immediately after high-intensity squats. To collect sufficient data, 14 players around 15.61 ± 0.4 year-old, having regular resistance training from high school rugby team were recruited as test subjects. After a standardized warm up, they took counter movement jumps (CMJ), 15-meters sprint as pretest (pre) and then did 5 squats on squat rack at a range of 85% 1RM (1 repetition maximum) successively. The posttests were held at the 4 minutes and 8 minutes after the above-mentioned exercises (post-4, post-8). A statistical analysis with 2 design factors is applied to observe the difference of the performance on the vertical jump and sprint between each group. The standard is set of α = .05. The following result shows that the measures to the performance of posttests revealed slightly progress. However, there were no obvious differences among the 3 tests, pre, post-4 and post-8, after all. The performance of CMJ: pre, 3.98±5.59 cm; post-4, 39.93 ±7.00 cm; post-8, 41.43 ±6.64 cm. The performance of the sprint exercise: pre, 2.46 ±0.19 sec; post-4, 2.44 ±0.09 sec; post-8, 2.41 ±0.06 sec. On the aspects of rate of fore development (RFD), peak value and impulse collected by a force plate, the 2 factors did not have obvious difference on the 3 tests except the impulse values at pre and post-4. Therefore, 5 squats at a range of 85% 1RM are not valid in particular for young rugby players.
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