Somani, YB, Boidin, M, Peggen, MAG, Wanders, I, Proctor, D, Low, DA, Jones, H, Lip, GYH and Thijssen, DHJ (2023) Single and 7-day handgrip and squat exercise prevents endothelial ischaemia-reperfusion injury in individuals with cardiovascular disease risk factors. American Journal of Physiology: Regulatory, Integrative and Comparative Physiology. ISSN 0363-6119

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Abstract

Background: Whole-body exercise provides protection against endothelial ischaemia-19 reperfusion (IR) injury. In this crossover study, we examined the effects of 1) single bout of 20 local exercise (handgrip, squats) on endothelial responses to IR, and 2) if 7 days of daily local 21 exercise bolsters these effects in individuals with cardiovascular disease (CVD) risk factors. 22 Methods: Fifteen participants (9 women, 58±5 years, ≥2 CVD risk factors) attended the 23 laboratory for 6 visits. Subsequent to familiarization (visit 1), on visit 2 (control) brachial 24 artery flow-mediated dilation (FMD) was measured before and after IR (15-minutes upper-25 arm ischemia, 15-minutes reperfusion). One week later, participants were randomized to 4x5-26 min unilateral handgrip (50% maximal voluntary contraction, 25 rpm) or squat exercises (15 27 rpm), followed by IR plus FMD measurements. Subsequently, home-based exercise was 28 performed (six days), followed by another visit to the laboratory for the IR protocol plus 29 FMD measurements (18-24 h after the last exercise bout). Following a two-week washout 30 period, procedures were repeated with the alternative exercise mode. 31 Results: For a single exercise bout, we found a significant IR injury*exercise mode 32 interaction (P<0.01), but no main effect of injury (P=0.08) or condition (P=0.61). A lower 33 post-IR FMD was evident after control (pre-IR: 4.3±2.1% to post-IR: 2.9±1.9%, P<0.01), but 34 not after handgrip (pre-IR: 3.8±1.6% to post-IR: 3.4±1.5%, P=0.31) or squats (pre-IR: 35 3.9±1.8% to post-IR: 4.0±1.9%, P=0.74). After 7 days of daily exercise, we found no change 36 in FMD post-IR following handgrip (pre-IR: 4.3±1.9% to post-IR: 4.7±3.2%) or squats (pre-37 IR: 3.7±2.1% to post-IR: 4.7±3.0%, P>0.05). 38 Conclusions: Single bouts of dynamic, local exercise (handgrip, squats) provides remote 39 protection against endothelial IR-induced injury in individuals with CVD risk factors, with 40 one-week daily, home-based exercise preserving these effects for up to 24h following the last 41 exercise bout.

Item Type:	Article
Additional Information:	Not to be used for commercial purposes
Uncontrolled Keywords:	06 Biological Sciences; 11 Medical and Health Sciences; Physiology
Subjects:	R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions:	Nursing & Allied Health Sport & Exercise Sciences
Publisher:	American Physiological Society
SWORD Depositor:	A Symplectic
Date Deposited:	23 Oct 2023 15:00
Last Modified:	23 Jan 2024 13:45
DOI or ID number:	10.1152/ajpregu.00168.2023
URI:	https://researchonline.ljmu.ac.uk/id/eprint/21743

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