臺灣博碩士論文加值系統

　　本研究目的在探討20∼30歲一般正常的男、女性分別從事等張向心運動其負荷強度百分比與反覆次數的關係，以及從事等長運動其自主性收縮最大肌力百分比與持續時間的關係。非運動選手的一般男、女大學生各20名參與本實驗，測量慣用腳膝伸肌肌力。等長運動測量膝關節彎曲60°時各負荷強度（40、50、60、70、80、90、100%MVC）之持續時間。相隔一週後，進行膝關節活動0∼90°度的等張向心運動各負荷強度（40、50、60、70、80、90、100%）的反覆次數測量。每兩個連續測量皆間隔一天。使用儀器為Cybex膝伸肌重量訓練機，自製緩降器以避免等張向心阻力復位時作離心收縮。男性等張向心運動負荷強度百分比與反覆次數的迴歸方程式為Reps=101.89-195.38L+95.67L2（L為%RM，Rep為反覆次數。此公式的限制規定為當L=1， 即100%RM時，Rep=1；適用於40∼100%），決定係數R2=.7771。女性為Reps=134.57-274084L+142088L2（僅適用於40%∼96%RM），決定係數R2=.7895。男性等長運動負荷強度百分比與持續時間的迦歸方程式為Time=150.04-192.53L+118.09L2（Time單位為秒，L為%MVC），決定係數R2=.8964。女性為Time=207-322.42L+118.09L2，決定係數R2=.8394。兩種運動中，絕對肌力（Kg）男性顯著大於女性（p<.05）。分別除以體重後的相對肌力雖然男、女差異變小，但男性仍顯著大於女性（p<.05）。 等張向心運動各個負荷強度百分比下男、女性的反覆次數並無顯著差異；然而在等長運動的50%RM及40於RM的持續時間女性卻顯著比男性持久（p<.05）。根據以上的迴歸方程式，在設計運動處方時，便可依此公式充分掌握明確的負荷強度及有效的反覆次數（等張向心運動）或所需的持續時間（等長運動），以增進肌力，爆發力及肌耐力訓練的最佳訓練效果。

　　The purpose of this study was to determine the relationship between percentage of one repetition maximun (%IRM) and repeptions of isotonic concentric exercise, and the relationship between percentage of maximum voluntary contraction (%MVC) and sustained time of isometric exereise in normal men and women aged 20~30 yeas. Twenty male and 20 female non-athletic students were measured using their dominant knee extensors. Isometric sustained times were measured at different %MVC(40, 50, 60, 70, 80, 90, 100%MVC) with the knee flexed at 60°. One week later, the numbers of repeptions of 0-90° isotonic concentric exercise at different %RM (40, 50, 60, 70, 80, 90, 100%IRM) were measured. Each Load measurement was separated by one day. Cybex Leg Extensor machine, equipped with a custom-made load-descending attenuator, was used in the study. The isotonic regression equation (40-100%RM) for the male was Rep=101.89-195.38L+95.67L2 (L indicates %RM and REM indicatesrepetitions, the restriction is that L equals to one, i.e., Rep will be set to one at 100%RM) , with coefficient of determination R2 equal to .7771. For the female, Rep=134.57-274284L+142.88L2 (40-96%RM), with R2 equal to .7895. In isometic exercise, Time=150.04-192.53L+45.54L2 for males (Time in seconds, L indicated %MVC), and Time=207-322.42L+118.09L2 for females, with R2equal to .8394 respectivaly. In both types of exercisa, the absolute strength (Kg) of male students were significantly (p<.05) greater than that of females. After normalization for body weigh, the differences in relative strength decreased but still significant (p<.05). There was no significant difference between males and female in the number of repeptions at various %RM. The females'' 50 and 40%MVC isometric sustained times were significamtly (p<.05) greater than that of the males. Using the above regression equations, the loads and their effective repetitions, or their sustained times can be more precisely determined to obtain optimal training effects for muscle strength, power, and endurance.