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題名 | 低強度離心運動對重複訓練效應及表層肌電訊號活性之影響=Effects of Low-Intensity Eccentric Exercise on Repeated Bout Effect and Surface Electromyographic Activity |
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作者 | 曾暐晉; 曾國維; 陳信良; 陳忠慶; | 書刊名 | 物理治療 |
卷期 | 41:3 2016.09[民105.09] |
頁次 | 頁189-198 |
專輯 | 神經肌肉適應性 |
分類號 | 418.996 |
關鍵詞 | 最大等速離心收縮; 預先運動訓練效應; 非肌肉損傷運動; 延遲性肌肉酸痛; 神經適應; Maximal voluntary isokinetic eccentric contractions; Preconditioning effect; Non-damaging exercise; Delayed onset muscle soreness; Neural adaptation; |
語文 | 中文(Chinese) |
中文摘要 | 背景與目的:人體單側膝伸肌群(knee extensors, KE)預先進行一回合低強度離心運動(10% eccentric contractions, 10%EC)不會引起肌肉損傷,但可在隨後7天內繼續進行一回合最大離心運動(maximal eccentric contractions, MAX)時,有效降低肌肉損傷現象,相關文獻推測可能與神經因素有關。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1週,繼續做60次MAX;CON僅以非慣用腿KE做60次MAX。比較兩組研究對象在做MAX前、中、後第0 ~ 5天之數個肌肉損傷或肌電圖指標。結果:實驗組在10%EC後,所有依變項均未產生顯著變化,但是在隨後進行MAX時,卻有效使肌力、肌肉酸痛與血液肌酸激酶活性的變化程度明顯比控制組的MAX來得小。實驗組在MAX時的均方根肌電訊號值與運動壓力值分別比控制組在MAX時來得大與小,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有效降低隨後進行MAX引起肌肉損傷效果,可能是藉由神經適應因素引起的。 |
英文摘要 | Background and purpose: Preconditioning exercise consisting of low-intensity eccentric exercise (10%EC) of the knee extensors (KE) does not induce signifi cant 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 have speculated that 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. The control group performed only a bout of 60 MAX using the non-dominant KE. 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, than during MAX for the control group. Conclusion: These results suggest that a bout of preconditioning exercise of 10%EC of the KE could efficiently attenuate muscle damage induced by subsequent MAX performed one week later by neural adaptation factors. |
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