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1 Biological Sciences, Michigan Technological University, Houghton, MI, USA
2 Medicine and Cellular and Molecular Physiology, Pennsylvania State University, Hershey, PA, USA
3 Biomedical Engineering, Michigan Technological University, Houghton, MI, USA
4 Biomedical Engineering, Michigan Technological University, Houghton, MI, USA; Biological Sciences, Michigan Technological University, Houghton, MI, USA
* To whom correspondence should be addressed. E-mail: whcooke{at}mtu.edu.
The effects of resistance training on arterial pressure and muscle sympathetic nerve activity (MSNA) at rest have not been established. Although endurance training is commonly recommended to lower arterial pressure, it is not known whether similar adaptations occur with resistance training. Therefore, we tested the hypothesis that whole-body resistance training reduces arterial blood pressure at rest, with concomitant reductions in MSNA. Twelve young (21 ± 0.3 yr; mean ± SE) subjects underwent a program of whole-body resistance training three d/wk for eight wk. Resting arterial pressure (n = 12; automated sphygmomanometer) and MSNA (n = 8; peroneal nerve microneurography) were measured during a five-min period of supine rest before and after exercise training. Thirteen additional young (21 ± 0.8 yr) subjects served as controls. Resistance training significantly increased one-repetition maximums in all trained muscle groups (P < 0.001), and significantly decreased systolic (130 ± 3 to 121 ± 2 mmHg; P = 0.01), diastolic (69 ± 3 to 61 ± 2 mmHg; P = 0.04), and mean (89 ± 2 to 81 ± 2 mmHg; P = 0.01) arterial blood pressures at rest. Resistance training did not affect MSNA or heart rate. Arterial blood pressures and MSNA were unchanged, but heart rate increased after eight wk of relative inactivity for subjects in the control group (61 ± 2 to 67 ± 3 beats/min; P = 0.01). These results indicate that whole-body resistance exercise training might decrease the risk for development of cardiovascular disease by lowering arterial blood pressure, but reductions of pressure are not coupled to resistance exercise-induced decreases of sympathetic tone.
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