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首页> 美国卫生研究院文献>Journal of Physical Therapy Science >Effect of Lactate Accumulation during Exercise-induced Muscle Fatigue on theSensorimotor Cortex
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Effect of Lactate Accumulation during Exercise-induced Muscle Fatigue on theSensorimotor Cortex

机译：运动性肌肉疲劳过程中乳酸的积累对骨骼肌的影响感觉运动皮层

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[Purpose] During exercise, skeletal muscle motor units are recruited based on afferent sensory input following peripheral metabolic by-product accumulation. The purpose of this study was to investigate whether lactate plays a role in conveying fatigue-related information to the brain. [Subjects] Eleven healthy adults participated in this study. [Methods] Subjects performed handgrip exercises at 10%, 30%, and 50% maximal voluntary contraction for 120 s. They were monitored for brachial artery blood pressure, respiratory quotient, muscle fatigue (integrated electromyogram, median power frequency), blood lactate levels, muscle blood flow, and brain activity. [Results] The handgrip exercise protocol caused significant muscle fatigue based on 28% and 37% reductions in median power frequency detected at 30% and 50% maximal voluntary contraction, respectively. Subjects exhibited intensity-dependent increases in blood pressure, respiratory quotient, muscle blood flow, and circulating lactate concentrations. Furthermore, brain activity increased at 30% and 50% maximal voluntary contraction. Multiple regression analysis identified muscle blood flow at 30% maximal voluntary contraction and lactate at 50% maximal voluntary contraction with standardized partial regression coefficients of −0.64 and 0.75, respectively. [Conclusion] These data suggest that blood lactate concentration and muscle blood flow, which reflect muscle metabolism, may convey load intensity information to thebrain during muscle fatigue.
机译：[目的]在运动中，根据周围代谢副产物的积累，根据传入的感觉输入来招募骨骼肌运动单位。这项研究的目的是调查乳酸是否在向大脑传达与疲劳有关的信息中起作用。 [对象] 11名健康成年人参加了这项研究。 [方法]受试者以最大自愿收缩的10％，30％和50％进行手握运动120 s。监测他们的肱动脉血压，呼吸商，肌肉疲劳（积分肌电图，中频功率频率），血液乳酸水平，肌肉血流量和大脑活动。 [结果]握把锻炼方案导致肌肉严重疲劳，这是由于在最大自愿收缩率分别为30％和50％时检测到的中频功率频率分别降低了28％和37％。受试者表现出血压，呼吸商，肌肉血流量和循环乳酸浓度的强度依赖性增加。此外，大脑活动在最大自愿收缩的30％和50％时增加。多元回归分析确定最大自愿收缩率为30％的肌肉血流和最大自愿收缩为50％的乳酸血，标准偏回归系数分别为-0.64和0.75。 [结论]这些数据表明反映肌肉新陈代谢的血乳酸浓度和肌肉血流量可能将负荷强度信息传递给肌肉。肌肉疲劳时的大脑。

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