Effect of Autonomic Responses After Isometric Training at Different Intensities on Obese People

Abstract

Background: Arterial hypertension is among the leading causes of mortality worldwide. The primary non-pharmacological management of arterial hypertension is isometric grip training, which has shown better results than pharmacological methods; however, it has not been thoroughly studied in large muscle groups. Objective: This study compared the pressor response of isometric exercise training at different intensities, in large versus small muscle groups, in sedentary eutrophic and overweight people aged 20-29 years. Methods: A sample of 93 people (57 people with excess weight and 36 people of normal weight) participated in isometric training for 5 days, subdivided into leg press versus Handgrip strength, with different intensities for each subgroup (30 and 50%, 1 RM). Before and after the 5 training days, heart rate variability (HRV) and systolic and diastolic blood pressure, BSBP-BDBP and PSBP-PDBP, were measured to evaluate the state of sympathetic activation at rest and pressor response. Results: Changes with significant differences (p <0.05) in terms of pre-post training measurements in the eutrophic group were the BSBP-PSBP variables at 30% and 50% 1 RM for manual isometric grip strength. In the excess weight group, the only significant change was the PSBP variable in Handgrip strength at 30% 1 RM. It should be noted that in all cases, blood pressure values tended to reduce. Conclusion: Isometric strength exercises in large and small muscle groups show a tendency to reduce blood pressure values; however, the isometric Handgrip force at 30% 1 RM shows statistically significant reductions in blood pressure values.

Muscle Oxygenation, Neural, and Cardiovascular Responses to Isometric and Workload-matched Dynamic Resistance Exercise

“…When the participants moved the stack weights during the dynamic protocol or held them at the specified position during the isometric protocol, the strain gauge recorded the force produced. The selection of RE characteristics was based on the premise that similar isometric exercise protocols (single or multiple 2-min contractions at 20–50% of MVC) are used either for improvements in health parameters or to assess changes in cardiovascular parameters 18 24 27 28 29 30 31 . In the isometric RE, the participants were asked to hold the weights at a 90° knee angle.…”

“…Unauthorized distribution is strictly prohibited. metric exercise protocols (single or multiple 2-min contractions at 20-50 % of MVC) are used either for improvements in health parameters or to assess changes in cardiovascular parameters [18,24,[27][28][29][30][31]. In the isometric RE, the participants were asked to hold the weights at a 90 ° knee angle.…”