背景與目的: 人體單側膝伸肌群(knee extensors，也)預先進行一回合低強度離心運動( 1 0% eccentric contractions, 1 0%EC)不會引起肌肉損噸，但可在l噓後7 天內繼續進行一回合最大離心運動(maximal eccentric contractions, MAX) 時，有效降低肌肉攝傷現象，相關文獻推測可能與神經因素布間。因此，研究目的針對上 述假設做探討。方法:一群健康男性成人隨機分成實驗與控制組( 11 人/組) 。實驗組以非慣用腿KE 做60 次 10%EC 後l 週﹒繼續做60 次MAX ; CON 僅以非慣用腿l也做60 次MAX 0 比較兩組研究對象在做MAX 前、 中、往第0 - 5 天之數個肌肉損傷或肌電間指標。結果: 實驗組在10%EC 後， 所有依變項均未產生顯著變化， 但是在隨投進行MAX 峙，卻有效使肌力、肌肉酸痛與血液肌酸激時活性的變化程度明顯比控制組的MAX * 得小。實驗組在MAX 峙的均方根肌電訊號值與運動壓力值分別比控制組在MAXU寄來得大與小﹒但兩組的力 矩峰值和平均數功率頻率則無差異。結論:此研究結果顯示. 10%EC 有效降低|適從進行MAX 引起肌肉損傷 效果，可能是藉由神經適應因素引起的刊物理治療20 1 6;41 (3): 189-198)

Background and purpose: Preconditioning exercise consisting of low-intensity cccentdc exercise (10%£C) of the knee extensors (KE) does not induce significant muscle damage, but can attenuate the extent of muscle damage induced by subsequent maximal isokinetic eccentric exercise (MAX) performed within 7 days later. Previous researchers liave speculated chat this effect could possibly be due to neural adaptations. Thus, the present study investigated the above hypothesis. Methods: A group of untrained healthy young men were randomly placed into experimental or control (N = 11/group) group. The experimental group performed 60 eccentric contractions with a loading of 10% maximal voluntary isometric contraction strength (10%EC) followed by 60 MAX of the KE of the non-dominant leg performed one week later. T!ie control group performed only a bout of 60 MAX using the non-dominant I<£. Several muscle damage or electromyography markers were measured before, during, and for 5 consecutive days post each exercise. Results: The results showed that: (1) None of the variables showed significant changes following 10%EC (p > 0.05) for the experimental group, but the 10%EC still attenuated the extent of muscle damage (strength, soreness, plasma creatine kinase activity) induced by subsequent MAX performed one week later; (2) Although peak torque and mean power frequency during MAX did not show a significant difference between the experimental and control groups, the extent of root-mean square and MAX stress ratio during MAX for the experimental group was significantly (p < 0,05) greater and smaller, respectively chan during MAX for the control group. Conclusion： These results suggest that a bout of preconditioning exercise of 10%EC of the ICE could efficiently attenuate muscle damage induced by subsequent MAX performed one week later by neural adaptation factors. (FJPT 2016;4l (3): 189-198)