What question did this study set out to answer?

To investigate the dynamic responses of ventilation, cardiac output, and pulmonary gas exchange during passive limb movement.

January 1, 1985The Japanese Journal of PhysiologyOpen Access

Cardiorespiratory dynamics in men in response to passive work.

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Why the study?

Does passive exercise alter cardiorespiratory dynamics in healthy men?

Population

n=4 healthy men

Comparison

Passive exercise on a motor-driven bicycle… vs Control pedaling rate of 30 rpm

Design

Other

Authors

YNYoshimi NakazonoAoyama Gakuin University YMYoshimi MiyamotoYamagata University

Discussion

Member takes

Implication

Supports reflex-mediated hyperpnea in healthy subjects; leaves open relevance to clinical populations or disease states.

Key Points

To investigate the dynamic responses of ventilation, cardiac output, and pulmonary gas exchange during passive limb movement.
Evaluated four healthy upright men undergoing passive exercise on a motor-driven bicycle ergometer with pedaling rates increased stepwise from 30 rpm to 90 rpm.
Continuously monitored stroke volume, heart rate, and cardiac output using automated impedance cardiography alongside breath-by-breath ventilatory and gas exchange parameters.
Cardiac output and minute ventilation increased beyond metabolic requirements with a half-response time of approximately 10 seconds and stayed elevated during the 90 rpm stimulus.
Oxygen consumption and carbon dioxide output increased transiently before returning to baseline after a few minutes, accompanied by a 1 Torr reduction in end-tidal carbon dioxide.
End-tidal oxygen pressure and gas exchange ratio rose transiently, indicating that passive hyperpnea is driven by mechanical reflexes from moving limbs or the right heart rather than chemoreceptors.

Structured PICO

Does passive exercise alter cardiorespiratory dynamics in healthy men?

Population

n=4 healthy men

Intervention

Passive exercise on a motor-driven bicycle ergometer with pedaling rate increased to a stimulus level of 90 rpm

Comparator

Control pedaling rate of 30 rpm

Outcome

Dynamic characteristics of ventilation, cardiac output, and gas exchange (including SV, HR, Q, VE, f, VT, VO2, VCO2, PETO2, PETCO2, and R)surrogate

Hyperpnea during passive exercise appears to be driven by reflexes mediated by moving limbs or the right heart rather than chemical stimuli.

Cite This Study

Nakazono et al. (1985) studied this question.

synapsesocial.com/papers/6a70825675498292b709f3f0 https://doi.org/10.2170/jjphysiol.35.33

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Cardiorespiratory dynamics in men in response to passive work.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Cardiorespiratory dynamics in men in response to passive work.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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