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KMID : 1140920210450040304
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Annals of Rehabilitation Medicine
2021 Volume.45 No. 4 p.304 ~ p.313
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A Single Bout of Constant-Load Exercise Test for Estimating the Time Constant of Oxygen Uptake Kinetics in Individuals With Stroke
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Oyake Kazuaki
Baba Yasuto
Suda Yuki
Murayama Jun
Mochida Ayumi
Ito Yuki
Abe Honoka
Kondo Kunitsugu
Otaka Yohei
Momose Kimito
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Abstract
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Objective: To examine the relationship between the time constant of oxygen uptake kinetics during the onset of exercise (τVO2) estimated from a single exercise bout and that obtained from three averaged exercise bouts in individuals with stroke.
Methods: Twenty participants with stroke performed three bouts of a constant-load pedaling exercise at approximately 80% of the workload corresponding to the ventilatory threshold to estimate τVO2. The VO2 data from the first trial of three bouts were used to estimate τVO2 for a single bout. Additionally, data collected from three bouts were ensemble-averaged to obtain τVO2 for three averaged bouts as the criterion.
Results: There was a very high correlation between τVO2 for a single bout (34.8±14.0 seconds) and τVO2 for three averaged bouts (38.5±13.4 seconds) (r=0.926, p<0.001). However, τVO2 for a single bout was smaller than that for three averaged bouts (p=0.006).
Conclusion: τVO2 for a single bout could reflect the relative difference in τVO2 for three averaged bouts among individuals with stroke. However, it should be noted that τVO2 for a single bout may be underestimated compared to τVO2 for three averaged bouts.
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KEYWORD
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Cerebrovascular disorders, Exercise test, Oxygen consumption, Rehabilitation
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