Oscillation in O₂ uptake in impulse exercise

Yano, T. and Afroundeh, R. and Yamanaka, R. and Arimitsu, T. and Lian, C.S. and Shirakawa, K. and Yunoki, T. (2014) Oscillation in O₂ uptake in impulse exercise. Acta Physiologica Hungarica, 101 (2). pp. 143-149. ISSN 0231-424X

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Abstract

The purpose of the present study was to examine 1) whether O₂ uptake (V̇O₂) oscillates during light exercise and 2) whether the oscillation is enhanced after impulse exercise. After resting for 1 min on a bicycle seat, subjects performed 5-min pre-exercise with 25 watts work load, 10-s impulse exercise with 200 watts work load and 15-min post exercise with 25 watts work load at 80 rpm. V̇O₂ during pre-exercise significantly increased during impulse exercise and suddenly decreased and re-increased until 23 s after impulse exercise. In the cross correlation between heart rate (HR) and V̇O₂ after impulse exercise, V̇O₂ strongly correlated to HR with a time delay of −4 s. Peak of power spectral density (PSD) in HR appeared at 0.0039 Hz and peak of PSD in V̇O₂ appeared at 0.019 Hz. The peak of the cross power spectrum between V̇O₂ and HR appeared at 0.0078 Hz. The results suggested that there is an oscillation in O₂ uptake during light exercise that is associated with the oscillation in O₂ consumption in active muscle. The oscillation is enhanced not only by change in O₂ consumption but also by O₂ content transported from active muscle to the lungs.

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