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Respiratory responses to passive and active recovery from exercise
T Takahashi1, K Niizeki, Y Miyamoto
1Department of Electrical and Information Engineering, Faculty of Engineering, Yamagata University, Yonezawa, Japan. takahasi@eie.yz.yamagata-u.ac.jp
The Japanese Journal of Physiology
|February 1, 1997
Summary
During exercise recovery, lung carbon dioxide output (VCO2) flux, not leg movement neural signals, primarily controls breathing (ventilation). Active recovery shows higher ventilation and VCO2 but similar ventilatory control to passive recovery.
Area of Science:
- Exercise Physiology
- Respiratory Control
- Human Physiology
Background:
- Neural components from leg movements may influence ventilation during exercise recovery.
- Understanding ventilatory control post-exercise is crucial for physiological recovery insights.
Purpose of the Study:
- To investigate the role of neural signals from leg movements in controlling ventilation during exercise recovery.
- To compare ventilatory and gas exchange responses during passive versus active recovery.
Main Methods:
- Eight healthy volunteers underwent steady-state cycling exercise (170 W).
- Minute ventilation (VE), oxygen uptake (VO2), and carbon dioxide output (VCO2) were measured during two recovery conditions: 5 min passive rest and 3 min active recovery (0 W) followed by 2 min rest.
- Phase-1 responses and off-transitional kinetics were analyzed.
Main Results:
- Phase-1 responses were observed during passive recovery but not active recovery.
- Carbon dioxide output (VCO2) kinetics were faster than ventilation (VE) kinetics during both recovery types.
- Ventilation (VE) decline was proportional to carbon dioxide output (VCO2) decline in both passive and active recovery, with similar VE-VCO2 regression lines.
Conclusions:
- Carbon dioxide (CO2) flux to the lungs is a key determinant of ventilatory drive during exercise recovery.
- Central command and neural afferents from contracting muscles are not essential for controlling ventilation during recovery from exercise.