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KMID : 1144120110010040232
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Biomedical Engineering Letters
2011 Volume.1 No. 4 p.232 ~ p.238
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Optimized exercise load control system based on Heart Rate Variability
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Hwang In-Seop
Noh Yeon-Sik
Jeong In-Cheol
Yoon Hyung-Ro
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Abstract
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Purpose: The purpose of this study is to present method of providing optimal physical exercise effect using Heart Rate Variability (HRV; LF/HF Ratio) during step-by-step exercise load.
Methods: In general, when physical exercise is started, heart rates and cardiac outputs tend to increase owing to increasing muscular activities. This study used HRV as an input parameter for optimized exercise load control, as it can reflect fluctuation of autonomic nervous systems. In addition, HRV was measured in real time while performing aerobic exercises to verify effects of HRV.
Results: Multiple-input and single-output (MISO) PID system with HRV showed the best performance in terms of exercise load stability (Damping parameter). In terms of exercise loads by system, the MISO PID System had the widest coverage among the three systems, which mean that given physical exercise would bring the most efficient exercise load and workout for each subject. From the result, two important facts were deduced: First, when the subjects engaged in the same type of physical exercise, they would get the most out of workout while remaining in the target zone when using the MISO PID control system. Second, the system showed the smallest variation in terms of exercise load (Manual System: 146±5.99; SISO PID System: 147±6.92; and MISO PID System: 151±3.18, p<0.001), the subject could perform physical exercise with minimal heart load.
Conclusions: When using HRV as control the system, it was possible to provide more stable exercise load to users automatically and get maximum exercise effects through minimal heart load.
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KEYWORD
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Optimized exercise load control system, HRV, PID control, Heart rate, Exercise load
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