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The use of the CR-10 scale to allow self-regulation of isometric exercise intensity in pre-hypertensive and hypertensive participants

The use of the CR-10 scale to allow self-regulation of isometric exercise intensity in pre-hypertensive and hypertensive participants

Morrin, Niamh M., Stone, Mark R., Swaine, Ian L. and Henderson, Keiran J. (2017) The use of the CR-10 scale to allow self-regulation of isometric exercise intensity in pre-hypertensive and hypertensive participants. European Journal of Applied Physiology, 118 (2). pp. 339-347. ISSN 1439-6319 (Print), 1439-6327 (Online) (doi:10.1007/s00421-017-3774-y)

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Abstract

Purpose:
Isometric exercise (IE) has been shown to lower blood pressure (BP). Using equipment with force output displays, intensity is usually regulated at 30% maximal voluntary contraction (MVC); however, the cost of programmable equipment and their requirement for maximal contractions presents limitations. A simple, cost-effective alternative deserves investigation. The purpose of this study was (i) to explore the relationship between %MVC, change in systolic BP (ΔSBP), and perceived exertion (CR-10) and (ii) to assess the validity of self-regulation of intensity during isometric handgrip exercise.

Methods:
Fourteen pre-hypertensive and hypertensive adults completed eight, 2-minute isometric handgrip exercises at randomised intensities; participants estimated their perceived exertion at 30-second intervals (Estimation Task). Subsequently, on three separate occasions participants performed four 2-minute contractions at an exertion level that they perceived to be equivalent to CR-10 “Level-6” (Production Task).

Results:
There were significant linear relationships between the estimated exertion on the CR-10 scale, and ΔSBP (r=0.784) and %MVC (r=0.845). Level 6 was equivalent to an average ΔSBP of 38mmHg (95% CI; 44mmHg, 32mmHg) and a relative force of 33% MVC (95% CI; 36.2%, 30%). During the production task, %MVC was not significantly different between the estimation task and each production task. In at least the first two repetitions of each production task, ΔSBP was significantly lower than that observed in the estimation task.

Conclusion:
These findings show that CR-10 “level-6” is an appropriate method of self-regulating isometric handgrip intensity; its use offers an affordable and accessible alternative for isometric exercise prescription aimed at reducing BP.

Item Type: Article
Uncontrolled Keywords: CR-10 scale, Exercise prescription, Estimation-production model, Isometric exercise, Perceived exertion
Subjects: Q Science > QP Physiology
R Medicine > RC Internal medicine > RC1200 Sports Medicine
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Centre for Science and Medicine in Sport and Exercise
Faculty of Engineering & Science > Department of Life & Sports Sciences
Last Modified: 03 May 2018 11:45
URI: http://gala.gre.ac.uk/id/eprint/18259

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