FATIGUE OF INTERMITTENT SUBMAXIMAL VOLUNTARY CONTRACTIONS - CENTRAL AND PERIPHERAL FACTORS
FATIGUE OF INTERMITTENT SUBMAXIMAL VOLUNTARY CONTRACTIONS - CENTRAL AND PERIPHERAL FACTORS
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DOI：
10.1152/jappl.1986.61.2.421
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发表时间：
1986-08-01
影响因子：
3.3
通讯作者：
WOODS, JJ
中科院分区：
文献类型：
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作者：
BIGLANDRITCHIE, B;FURBUSH, F;WOODS, JJ
研究了人股四头肌和比目鱼肌次极量间歇等长收缩疲劳的中枢和外周因素。受试者重复6 s，50%最大自主收缩（MVC），然后休息4 s，直到耐力极限（Tlim）。定期进行疲劳试验。这包括短暂的MVC，在休息期间以50 Hz进行单次电击或8次脉冲，以及叠加在目标力自主收缩上的电击。在Tlim，MVC力下降了50%，通常与50 Hz刺激的力平行。叠加在目标力上的抽搐下降得更快，在Tlim完全消失。在对拇收肌的类似实验中，未观察到诱发的M波减少。结果表明，在该方案诱导的四头肌和拇收肌疲劳过程中，没有明显的中枢疲劳，但在比目鱼肌中有一定的疲劳。因此，力产生能力的降低可能主要或完全是由于肌肉收缩装置的失效。
Central and peripheral factors were studied in fatigue of submaximal intermittent isometric contractions of the human quadriceps and soleus muscles. Subjects made repeated 6 s, 50% maximal voluntary contractions (MVC) followed by 4 s rest until the limit of endurance (Tlim). Periodically, a fatigue test was performed. This included a brief MVC, either a single shock or 8 pulses at 50 Hz during a rest period and a shock superimposed on a target force voluntary contraction. At Tlim, the MVC force had declined by 50%, usually in parallel with the force from stimulation at 50 Hz. The twitches superimposed on the target forces declined more rapidly, disappearing entirely at Tlim. In similar experiments on adductor pollicis, no reduction of the evoked M wave was seen. The results suggest that, during fatigue of quadriceps and adductor pollicis induced by this protocol, no central fatigue was apparent, but some was seen in soleus. Thus the reduced force-generating capacity could result mainly or entirely from failure of the muscle contractile apparatus.