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Kinetics of cardiorespiratory response to dynamic and rhythmic — static exercise in men

  • Ryszard Grucza
  • Yoshimi Miyamoto
  • Yoshimi Nakazono
Article

Summary

Kinetics of cardiorespiratory response to dynamic (DE) and then to rhythmic-static exercise (RSE) was compared in nine male subjects exercising in an upright position on a cycle ergometer at an intensity of about 50 % \(\dot V\)O2max and a mean pedalling frequency of 60 rpm over 5 min. Respiratory frequency (fR), tidal volume (VT), minute ventilation (\(\dot V\)E), heart rate (fc), stroke volume (SV), and cardiac output (Qt) were measured continuously. The RSE caused a greater increase in fR than DE, whereas VT increased more during DE. The effect of reciprocal changes in fR and VT was that \(\dot V\)E and its kinetics, expressed as a time constant (τ), did not differ between experimental situations. The ventilatory equivalent for O2 (\(\dot V\)E: \(\dot V\)O2) was greater for RSE (31.3) than for DE (23.0, P<0.01). Elevation of fc was similar for both types of exercise. The SV increased suddenly at the beginning of DE from 54 ml to 74 ml and then decreased to the end of exercise. At the onset of RSE only a moderate increase in SV was observed, from 56 ml to 62 ml, and then SV remained stable. The DE caused a greater and faster increase in Qt (4.20 l · min−1, for τ equal to 16.1s) than RSE (3.25 l · min−1, for τ equal to 57.0s, P<0.05 and P<0.002, respectively). Total peripheral resistance was almost 40% greater for RSE than for DE. No relationship was found between Qt and VE at the first 15 s of both types of exercise. It is concluded that the kinetics of \(\dot V\)E did not depend on to kinetics of Qt in the exercising subjects. This finding contradicts the hypothesis of cardiodynamic hyperpnoea indicating an importance of neurogenic factors, mediated either centrally or peripherally, in fast cardiorespiratory responses to exercise.

Key words

Exercise Respiration Stroke volume Cardiac output Hyperpnoea 

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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • Ryszard Grucza
    • 1
  • Yoshimi Miyamoto
    • 2
  • Yoshimi Nakazono
    • 2
  1. 1.Department of Applied Physiology, Medical Research CentrePolish Academy of SciencesWarsawPoland
  2. 2.Department of Information Engineering, Faculty of EngineeringYamagata UniversityYonezawaJapan

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