Anaerobic threshold determination by blood lactate and myoelectric signals.
Anaerobic threshold determination by blood lactate and myoelectric signals.
复制标题
通过血乳酸和肌电信号确定无氧阈值。
DOI：
10.2170/jjphysiol.31.585
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发表时间：
1981
期刊：
影响因子：
--
通讯作者：
Takayoshi Yoshida
中科院分区：
文献类型：
--
作者：
A. Nagata;M. Muro;T. Moritani;Takayoshi Yoshida
本研究探讨了肌电信号分析在无氧阈值(AT)测定中的潜在应用。10名大学生在自行车测功机上进行递增负荷运动，在此过程中，分别采集臂动脉和桡动脉的血样，并记录相应的积分肌电(IEMG)和功率谱。通过观察动脉血乳酸、PO2、二氧化碳分压、HCO3-和pH的变化来测定血AT。EMG AT由IEMG的非线性增加和代表最活跃频段的峰值频率(FRQ70%)的70%处的频带突然增加所确定。结果表明，FRQ70%在血液AT发生后即刻显著升高(p<0.05)。但峰值频率未见明显增加。回归分析显示，肌电AT-VO2与AT-VO2呈显著正相关(r=0.921，p<0.001)，与AT-VO2气体交换呈显著正相关(r=0.921，p<0.001)。结论：对反映运动单位募集和放电频率的肌电信号的分析可以提供AT的无创性评估。
This study examined the potential use of myoelectric signal analysis for determination of anaerobic threshold (AT). Ten college students performed incremental exercise on a bicycle ergometer during which blood samples from either the brachial or radial artery were drawn and corresponding intergrated electromyogram (IEMG) and power spectra also were recorded. Blood AT was determined by observing the changes in arterial blood lactate, Po2 Pco2, HCO3-, and pH. EMG AT was determined by the non-linear increase in IEMG and abrupt increase in frequency band width at 70% of the peak frequency (FRQ70%) which could represent the most active frequency band. The results indicated that a significant increase in FRQ70% occurred immediately after the occurrence of blood AT (p less than 0.05). However, no significant increase could be found in peak frequency. Regression analyses revealed that EMG AT Vo2 correlated significantly with blood AT Vo2 (r = 0.921, p less than 0.001) and with gas exchange AT Vo2 (r = 0.921, p less than 0.001). It was concluded that analysis of myoelectric signals, which reflect motor unit recruitment and discharge frequency, could provide a non-invasive estimate of AT.