Journal of Applied Physiology AJP: Renal Physiology
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J Appl Physiol 84: 277-283, 1998;
8750-7587/98 $5.00
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Vol. 84, Issue 1, 277-283, January 1998

Forearm training reduces the exercise pressor reflex during ischemic rhythmic handgrip

Sogol Mostoufi-Moab1, Eric J. Widmaier1, Jacob A. Cornett1, Kristen Gray1,2, and Lawrence I. Sinoway1,2

1 Division of Cardiology, The Milton S. Hershey Medical Center, The Pennsylvania State University, Hershey 17033; and 2 Lebanon Veterans Affairs Medical Center, Lebanon, Pennsylvania 17042

Mostoufi-Moab, Sogol, Eric J. Widmaier, Jacob A. Cornett, Kristen Gray, and Lawrence I. Sinoway. Forearm training reduces the exercise pressor reflex during ischemic rhythmic handgrip. J. Appl. Physiol. 84(1): 277-283, 1998.---We examined the effects of unilateral, nondominant forearm training (4 wk) on blood pressure and forearm metabolites during ischemic and nonischemic rhythmic handgrip (30 1-s contractions/min at 25% maximal voluntary contraction). Contractions were performed by 10 subjects with the forearm enclosed in a pressurized Plexiglas tank to induce ischemic conditions. Training increased the endurance time in the nondominant arm by 102% (protocol 1). In protocol 2, tank pressure was increased in increments of 10 mmHg/min to +50 mmHg. Training raised the positive-pressure threshold necessary to engage the pressor response. In protocol 3, handgrip was performed at +50 mmHg and venous blood samples were analyzed. Training attenuated mean arterial pressure (109 ± 5 and 98 ± 4 mmHg pre- and posttraining, respectively, P < 0.01), venous lactate (2.9 ± 0.4 and 1.8 ± 0.3 mmol/l pre- and posttraining, respectively, P < 0.01), and the pH response (7.21 ± 0.02 and 7.25 ± 0.01, pre- and posttraining, respectively, P < 0.01). However, deep venous O2 saturation was unchanged. Training increased the positive-pressure threshold for metaboreceptor engagement, reduced metabolite concentrations, and reduced mean arterial pressure during ischemic exercise.

metaboreceptor; reflex pressor response; sympathetic nervous system; ischemic exercise

The Journal of Applied Physiology 84(1):277-283
0161-7567/98 $5.00 Copyright © 1998 the American Physiological Society


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