Quantification of Physical Activities Simulated Exercise Therapy in Ambulatory Inpatients Using Surface Electromyogram from the Vastus Medialis

T. Tsuji, Chiaki Wada, M. Kawanishi, Yasuhisa Fujita, Y. Kamijo, Y. Umemoto, K. Kouda, Kazunari Nishiyama, F. Tajima, Yukihide Nishimura
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Abstract

The present study aimed to assess whether surface electromyogram (sEMG) signal from the vastus medialis could be a candidate method to quantify physical activities during combined activities in ambulatory persons (ergometer exercise, treadmill walking, and squatting). In the first trial, twelve healthy men performed a graded cycle ergometer exercise at 0%, 30%, 60%, and 80% of peak oxygen consumption rate (VO 2peak ), followed by treadmill walking at 0, 2, 4, and 6 km/h for 3 min of each, and each exercise was intermitted by 3 min of rest. sEMG from the Vastus Medialis Oblique Longus (VML) was collected, and the integrated amplitude of spikes (sEMGAMP) were calculated every minute. Positive correlations were observed between ∆VO 2 and ΣsEMG AMP ; data at sampling frequency of 250Hz in both exercise types were plotted (r=0.888; P<0.0001; y=339.04x+4.0267). In the second trial, thirteen healthy participants (three women) performed the combined exercise comprising 3 min each for optimal walking (3 km/h), fast walking (5 km/h and 6 km/h for women and men, respectively), squatting, second optimal walking, and ergometer exercise at 30% VO 2peak , which were intermitted by 30 sec. Finally, they performed ergometer exercise at 100% VO 2peak for 1 min followed by 3-min cool-down (0W). Changes (∆) in VO 2 from the resting value and sEMG AMP during exercise were summed throughout the exercise period (Σ∆VO 2 and ΣsEMG AMP ). ΣΔsEMG AMP was positively correlated with ΣΔVO 2 (r=0.68, p=0.011, @250Hz). Monitoring sEMG from VML may be a candidate method for the evaluation of physical activities for exercise therapy in ambulatory persons.
利用股内侧肌表肌电图量化非卧床病人的模拟运动治疗
本研究旨在评估来自股内侧肌的表面肌电图(sEMG)信号是否可以作为一种候选方法来量化活动者在联合活动(测力仪运动、跑步机行走和下蹲)期间的身体活动。在第一项试验中,12名健康男性在0%、30%、60%和80%的峰值耗氧率(vo2peak)下进行了渐进式循环力计运动,然后在跑步机上以0、2、4和6公里/小时的速度步行3分钟,每次运动中间休息3分钟。收集股内侧斜长肌(VML)的肌电信号,每分钟计算一次综合峰幅(sEMGAMP)。∆VO 2与ΣsEMG AMP呈正相关;绘制采样频率为250Hz时两种运动类型的数据(r=0.888;P < 0.0001;339.04 x + y = 4.0267)。在第二项试验中,13名健康参与者(3名女性)进行了3分钟的组合运动,分别为最佳步行(3公里/小时)、快速步行(女性和男性分别为5公里/小时和6公里/小时)、深蹲、第二最佳步行和30% VO 2峰值的测力仪运动,这些运动间隔30秒。最后,他们以100% VO 2峰值进行了1分钟的测力仪运动,然后进行了3分钟的冷却(0W)。计算运动期间VO 2与静息值和sEMG AMP的变化(∆)(Σ∆VO 2和ΣsEMG AMP)。ΣΔsEMG AMP与ΣΔVO 2呈正相关(r=0.68, p=0.011, @250Hz)。监测VML的肌电图可能是评估运动治疗中运动活动的候选方法。
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