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Vol. 84, Issue 1, 116-122, January 1998
1 Laboratory of Exercise
Physiology and Sports Science,
Nishiyasu, Takeshi, Nobusuke Tan, Keiko Morimoto, Ryoko
Sone, and Naotoshi Murakami. Cardiovascular and humoral responses to sustained muscle metaboreflex activation in humans.
J. Appl. Physiol. 84(1): 116-122, 1998.
The cardiovascular and humoral responses to sustained muscle
metaboreflex activation were examined in eight male volunteers while
they performed two 24-min exercise protocols. Each of these consisted
of six 1-min bouts of isometric handgrip exercise (the left and right
hands being used alternately) at 50% of maximal voluntary contraction;
after each bout, there was either 3-min postexercise occlusion
(occlusion protocol) or 3-min rest (control protocol). In the occlusion
protocol, mean arterial blood pressure was ~25 mmHg higher than
during the control protocol, indicating that the muscle metaboreflex
was activated during occlusion. During the control protocol, plasma
renin activity, plasma vasopressin, and adrenocorticotropic hormone
values were not significantly different from the values at rest. During
the occlusion protocol, however, plasma renin activity, plasma
vasopressin, and adrenocorticotropic hormone were all significantly
increased at 25 min. These data demonstrate that, in humans, the
sustained activation of the muscle metaboreflex causes the secretion of several hormones originating from different regions.
skeletal muscle metaboreflex; plasma renin activity; adrenocorticotropic hormone; arginine vasopressin; mean arterial blood pressure
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