Mechanomyography of the human quadriceps muscle during incremental cycle ergometry
Mechanomyography of the human quadriceps muscle during incremental cycle ergometry
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增量循环测力期间人体股四头肌的肌力图
DOI：
10.1007/s004210050254
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
T. Fukunaga
中科院分区：
文献类型：
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作者：
M. Shinohara;M. Kouzaki;T. Yoshihisa;T. Fukunaga
摘要用机械肌图(MMG)研究了人股四头肌在最大递增周期测功术中的机械活动。取9名男性的股外侧肌活动的MMG和表面肌电(EMG)记录。以60 转速/分钟进行循环测功，工作负荷每分钟递增20 W(3.2 Nm)，直至意志性疲劳。根据每个负荷的最后6次收缩计算收缩相的平均肌电幅度(MMMG)和肌电平均幅度(MEMG)。力竭运动持续时间为13.3(1.6) min，负荷为44.1(5.5) Nm，负荷为276.7(34.7) W。在每个受试者中，平均肌电信号与负荷呈明显的线性关系(r = 0.868-0.995)，而肌电信号似乎随着负荷的增加而解离。在分组平均数据中，无论是与绝对负荷(r = 0.995)还是最大负荷(r = 0.995)对齐，mMMG均与负荷呈线性相关。通过四名受试者对被动自行车的研究，进一步调查了噪声成分的参与程度。在每个阶段的前半部分，受试者被动地旋转踏板(PAS)，然后在后半部分(ACT)推踏板。在较轻负荷区，ACT的mMMG与PAS的mMMG一样小。然而，与ACT相比，PAS的mMMG变化很小。综上所述，这项研究证实了在最大递增循环测功术中，股四头肌的mMMG与工作负荷之间存在线性关系。认为运动噪声的影响较小且稳定。
Abstract The mechanical activity of the human quadriceps muscle during maximal incremental cycle ergometry was investigated by mechanomyography (MMG). MMG and surface electromyography (EMG) recordings of vastus lateralis muscle activity were obtained from nine males. Cycle ergometry was performed at 60 rev/min and work load was incremented step wise by 20 W (3.2 Nm) every minute until volitional fatigue. The mean amplitudes of MMG (mMMG) and EMG (mEMG) during the contraction phase were calculated from the last six contractions in each load. The duration, load and work rate of exercise at exhaustion were 13.3 (1.6) min, 44.1 (5.5) Nm, 276.7 (34.7) W, respectively. A linear relationship between mMMG and load was evident in each subject (r = 0.868–0.995), while mEMG seemed to dissociate as the load became greater. In the grouped mean data, mMMG was linearly related to load whether aligned to the absolute (r = 0.995) or maximal (r = 0.995) load. Involvement of the noise component was further investigated by studying passive cycling by four subjects. Pedals were rotated passively for the first half of each stage (PAS) and the subject then pushed the pedals for the second half (ACT). In the lighter load region, the mMMG of ACT was as small as that of PAS. However, the change in the mMMG of PAS was very small compared with that of ACT. In conclusion, this study demonstrates a linear relationship between the mMMG of the quadriceps muscle and work load during maximal incremental cycle ergometry. The effect of movement noise was thought to be small and stable.