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1 Department of Integrative Physiology, University of North Texas Health Science Center, Fort Worth, Texas 76107; and 2 Department of Biology, College of Science, Southern University, Baton Rouge, Louisiana 70813
We sought to determine the relative
contributions of cessation of skeletal muscle pumping and withdrawal of
central command to the rapid decrease in arterial pressure during
recovery from exercise. Twelve healthy volunteers underwent three
exercise sessions, each consisting of a warm-up, 3 min of cycling at
60% of maximal heart rate, and 5 min of one of the following recovery
modes: seated (inactive), loadless pedaling (active), and passive
cycling. Mean arterial pressure (MAP), cardiac output, thoracic
impedance, and heart rate were measured. When measured 15 s after
exercise, MAP decreased less (P < 0.05) during the active (
3 ± 1 mmHg) and passive (6 ± 1 mmHg) recovery modes than during inactive (18 ± 2 mmHg) recovery. These differences in MAP persisted for the first 4 min
of recovery from exercise. Significant maintenance of central blood
volume (thoracic impedance), stroke volume, and cardiac output
paralleled the maintenance of MAP during active and passive conditions
during 5 min of recovery. These data indicate that engaging the
skeletal muscle pump by loadless or passive pedaling helps maintain MAP
during recovery from submaximal exercise. The lack of differences
between loadless and passive pedaling suggests that cessation of
central command is not as important.
cardiac output; arterial blood pressure; heart rate; peripheral resistance; stroke volume
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