Key result
Pedaling exercise largely counteracts decreased stroke volume and cardiac output during lower body negative pressure.
Why the study?
The effects of muscle pump during pedaling exercise on blood circulation under lower body positive and negative pressure conditions were evaluated to understand hemodynamic changes.
Does the muscle pump of pedaling exercise counteract the hemodynamic effects of lower body negative and positive pressure in healthy males?
Comparison
Pedaling exercise at 50 watt and 100 watt vs resting period under 0, +40, and -40 mmHg lower body pressure
Design
Experimental study using lower body pressurization device with bicycle ergometer in recumbent position
Authors
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Muscle pump compensation for LBNP seen in 5 volunteers offers no clinical guidance; leaves open relevance to patients with impaired circulation.
Does the muscle pump of pedaling exercise counteract the hemodynamic effects of lower body negative and positive pressure in healthy males?
The muscle pump action from pedaling exercise effectively counteracts the reduction in venous return and stroke volume induced by lower body negative pressure.
Nishiyasu et al. (1985) studied Healthy (n=5). Pedaling exercise (muscle pump) vs. Rest condition was evaluated on Hemodynamic changes (HR, SV, Q, STI) during LBNP. The muscle pump of pedaling exercise at 100 watts largely counteracted the marked hemodynamic changes, including decreased stroke volume and cardiac output, induced by lower body negative pressure.
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