Markers of isometric training intensity and reductions in resting blood pressure |
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Authors: | Devereux Gavin R Wiles Jonathan D Swaine Ian |
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Institution: | School of Social and Health Sciences, University of Abertay Dundee, Dundee, UK. g.devereux@abertay.ac.uk |
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Abstract: | In this study, we examined the correlations between selected markers of isometric training intensity and subsequent reductions in resting blood pressure. Thirteen participants performed a discontinuous incremental isometric exercise test to volitional exhaustion at which point mean torque for the final 2-min stage (2min-torque(peak)) and peak heart rate peak (HR(peak)) were identified. Also, during 4 weeks of training (3 sessions per week, comprising 4?×?2?min bilateral leg isometric exercise at 95% HR(peak)), heart rate (HR(train)), torque (Torque(train)), and changes in EMG amplitude (ΔEMG(amp)) and frequency (ΔEMG(freq)) were determined. The markers of training intensity were: Torque(train) relative to the 2min-torque(peak) (%2min-torque(peak)), EMG relative to EMG(peak) (%EMG(peak)), HR(train) ΔEMG(amp), ΔEMG(freq), and %MVC. Mean systolic (-4.9 mmHg) and arterial blood pressure (-2.7mmHg) reductions correlated with %2min-torque(peak) (r?=?-0.65, P?=?0.02 and r?=?-0.59, P?=?0.03), ΔEMG(amp) (r?=?0.66, P?=?0.01 and r?=?0.59, P?=?0.03), ΔEMG(freq) (r?=?-0.67, P?=?0.01 and r?=?-0.64, P?=?0.02), and %EMG(peak) (systolic blood pressure only; r?=?-0.63, P?=?0.02). These markers best reflect the association between isometric training intensity and reduction in resting blood pressure observed after bilateral leg isometric exercise training. |
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