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论文类型：期刊论文
发表时间：2021-06-01
发表刊物：PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
卷号：235
期号：2,SI
页面范围：471-478
ISSN号：0954-4062
关键字：Oxygen uptake kinetics; slow component of VO2; surface electromyography; wavelet analysis; mean power frequency
摘要：The purpose of this study was to investigate the influence of muscle fiber type on the slow component of oxygen uptake (VO2) kinetics and electromyographic activity. Twelve sprinters and ten endurance runners participated in the study. They performed two separate treadmill running tests, the first test being conducted to determine the ventilatory threshold and maximal oxygen uptake. The second test consisted of a 6 min running bout at severe exercise intensity. A two-component exponential model was used to fit the VO(2)response. Surface electromyographic signals were collected fromVastus lateralis, and processed by wavelet analysis. Sprinters and endurance runners, with their distinct anaerobic and aerobic fitness, showed a substantial difference in VO(2)slow component during severe exercise. The sprinters showed a significantly higher VO(2)slow component amplitude (A(2): 381.0 +/- 96.3 mL/min) and a significantly earlier slow component onset (TD2: 118.1 +/- 16.1 s) than the endurance runners (A(2): 142.2 +/- 58.4 mL/min, TD2: 145.9 +/- 19.9 s). The electromyographic mean power frequency of the tested muscles increased significantly during the slow component phase. There is a significant correlation between VO(2)slow component and electromyographic mean power frequency for endurance runners (r = 0.50,p = 0.003). The combined use of VO(2)kinetics modeling and electromyographic measurement provides evidence of the influence of muscle fiber type on slow component of oxygen uptake kinetics during severe intensity exercise.