title: Markers of isometric training intensity and reductions in resting blood pressure.
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.
authors.affiliation: School of Social and Health Sciences, University of Abertay Dundee, Dundee, UK. g.devereux@abertay.ac.uk
authors.forename: Gavin R
authors.initials: GR
authors.lastname: Devereux
authors.forename: Jonathan D
authors.initials: JD
authors.lastname: Wiles
authors.forename: Ian
authors.initials: I
authors.lastname: Swaine
mesh_terms: D000328:Adult; D015415:Biomarkers; D001794:Blood Pressure; D004576:Electromyography; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006339:Heart Rate; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D007866:Leg; D008297:Male; D010806:Physical Education and Training; D010807:Physical Endurance / Q000502:physiology*; D012146:Rest / Q000502:physiology*; D019415:Torque; D055815:Young Adult
chemical_list: D015415:Biomarkers