Forearm training reduces the exercise pressor reflex during ischemic rhythmic handgrip
Autor: | Eric J. Widmaier, Kristen S. Gray, Sogol Mostoufi-Moab, Jacob A. Cornett, Lawrence I. Sinoway |
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Rok vydání: | 1998 |
Předmět: |
Adult
Male medicine.medical_specialty Sympathetic nervous system Physiology Ischemia Physical exercise Baroreflex Oxygen Consumption Rhythm Forearm Physiology (medical) Internal medicine medicine Humans Muscle Skeletal Exercise Hand Strength business.industry Hemodynamics Carbon Dioxide Hand medicine.disease medicine.anatomical_structure Physical Fitness Regional Blood Flow Anesthesia Respiratory Mechanics Reflex Cardiology business |
Zdroj: | Journal of Applied Physiology. 84:277-283 |
ISSN: | 1522-1601 8750-7587 |
DOI: | 10.1152/jappl.1998.84.1.277 |
Popis: | 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. |
Databáze: | OpenAIRE |
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