文摘
背阔肌肌肉的能力(LD)参与作为一个辅助吸气肌肉一直争论的焦点。肌(基于活动的LD在11名健康受试者评估(30岁+ / - 2年;一秒用力呼气量(FEV1) 106 + / - 5%预测;最大吸气压(Pmax) 120 + / - 6 cmH2O)不同呼吸条件下。侧肱二头肌被选为控制肌肉。EMG记录从表面电极,但电极针也用于LD评估在三个科目的一个子集。EMG信号来自肌肉同时被记录,纠正和集成,减法的心电图信号。情况下评估:1)最大随意收缩(MVC);2)呼吸暂停;和3)呼吸在进步吸气阈值负载下(Pmax 20 - 100%,在20%的时间间隔)。 A close relationship was evident between LD recordings from surface and needle electrodes (r = 0.975). Activity of LD at baseline was 1.8 +/- 0.4% MVC, and showed a phasic increase during inspiration under loads. This change had a linear tendency and was significant for loads corresponding to 40, 60, 80 and 100% of Pmax when compared to the control muscle. At this latter level, LD activity was equivalent to 32 +/- 5% MVC (range 11-61%), whereas mean activity of the control muscle was less than 7.5% MVC.(ABSTRACT TRUNCATED AT 250 WORDS)