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肘屈肌群離心運動引起肌肉損傷對肱動脈血管功能的影響

Effect of Eccentric Exercise-Induced Muscle Damage of the Elbow Flexors on Changes in Vascular Function of Brachial Artery

摘要


Purpose: To test the hypothesis that maximal eccentric exercise-induced muscle damage of the elbow flexors would produce significant changes in brachium artery stiffness and blood flow volume. Methods: Fifteen untrained young men performed a bout of 30 maximal isokinetic (30°/s) eccentric contractions of the elbow flexors of the non-dominant arm. Maximal isometric strength, muscle soreness, upper arm circumference, pulsatility index, resistance index, blood flow volume and heart rate measurements were taken before, immediately after, and for 4 consecutive days after maximal eccentric contractions. Results: Significant changes were noted in maximal isometric strength, upper arm circumference, muscle soreness, blood flow volume and pulsatility index following maximal eccentric exercise, and these variables had still not returned to baseline levels at 4 days after maximal eccentric contractions (p<.05). No significant changes in heart rate and resistance index following maximal eccentric contractions were observed compared with pre-maximal eccentric contractions levels. Conclusion: These results suggest that the high tension produced during maximal eccentric exercise to the exercised muscles (e.g. maximal isometric strength loss) and blood tissues (decrease in pulsatility index) would produce microtrauma, launching a series of inflammatory response events. This in turn would lead to further increases in artery blood flow volume, in order to gain more oxygen and nutrient materials for the repair/regeneration of damaged tissue.

並列摘要


Purpose: To test the hypothesis that maximal eccentric exercise-induced muscle damage of the elbow flexors would produce significant changes in brachium artery stiffness and blood flow volume. Methods: Fifteen untrained young men performed a bout of 30 maximal isokinetic (30°/s) eccentric contractions of the elbow flexors of the non-dominant arm. Maximal isometric strength, muscle soreness, upper arm circumference, pulsatility index, resistance index, blood flow volume and heart rate measurements were taken before, immediately after, and for 4 consecutive days after maximal eccentric contractions. Results: Significant changes were noted in maximal isometric strength, upper arm circumference, muscle soreness, blood flow volume and pulsatility index following maximal eccentric exercise, and these variables had still not returned to baseline levels at 4 days after maximal eccentric contractions (p<.05). No significant changes in heart rate and resistance index following maximal eccentric contractions were observed compared with pre-maximal eccentric contractions levels. Conclusion: These results suggest that the high tension produced during maximal eccentric exercise to the exercised muscles (e.g. maximal isometric strength loss) and blood tissues (decrease in pulsatility index) would produce microtrauma, launching a series of inflammatory response events. This in turn would lead to further increases in artery blood flow volume, in order to gain more oxygen and nutrient materials for the repair/regeneration of damaged tissue.

參考文獻


陳忠慶、陳信良(2005)。離心運動對血液肌肉蛋白質評估指標的反應。運動生理暨體能學報。2,1-17。
陳忠慶(2004)。運動引起肌肉損傷的原因之探討。運動生理暨體能學報。創刊號,19-32。
Ahmadi, S.,Sinclair, P. J.,Davis, G. M.(2008).Muscle oxygenation after downhill walking-induced muscle damage.Clinical Physiology and Functional Imaging.28(1),55-63.
Byrne, C.,Twist, C.,Eston, R.(2004).Neuromuscular function after exercise-induced muscle damage: theoretical and applied implications.Sports Medicine.34,49-69.
Chen, H. L.,Chen, T. C.(2004).Effects of a single bout of intensive eccentric contractions at varying repetitions on muscle damage.Annual Journal of Physical Education and Sports Science.4,103-117.

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