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The Journal of Sports Medicine and Physical Fitness 2020 Jun 18

DOI: 10.23736/S0022-4707.20.10822-3

Copyright © 2020 EDIZIONI MINERVA MEDICA

lingua: Inglese

Ischemic preconditioning improves performance and accelerates the heart rate recovery

Rhaí A. ARRIEL, Anderson MEIRELES, Rodrigo HOHL, Moacir MAROCOLO

Department of Physiology, Universidade Federal de Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil


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BACKGROUND: Previous studies have assessed the effects of ischemic preconditioning (IPC) on exercise performance and physiological variables, such as lactate and muscle deoxygenation. In this study, we verified the IPC effects on heart rate and performance during and immediately after a maximal incremental cycling test.
METHODS: Eighteen recreationally trained cyclists (28 ± 4 years) were allocated to one of three groups: IPC, SHAM and Control. After the first visit to familiarization, cyclists attended the laboratory on two separate occasions to perform an incremental cycling test: in the 1st visit they performed the reference test (baseline), and in 2nd the test ischemic preconditioning (2 cycles of 5-min occlusion [at 50 mm Hg above systolic arterial pressure]/ 5-min reperfusion), SHAM (identical to ischemic preconditioning, but at 20 mm Hg) or control (no occlusion) interventions (post intervention). During the incremental cycling test, heart rate, power output and perceived exertion were measured and the heart rate was monitored throughout the recovery.
RESULTS: Only ischemic preconditioning group improved performance time by 4.9 ± 4.0% and decreased heart rate at submaximal point during incremental cycling test, of 170 ± 8 to 166 ± 8 bpm (p<0.05). Also, IPC promoted faster heart rate recovery, mainly on first minute (from 151 ± 9 to 145 ± 8 bpm; p<0.05), compared to baseline. No differences for other parameters were found.
CONCLUSIONS: Two cycles of five minutes of ischemia were relevant to produce positive effects on performance and alter the heart rate during and soon after incremental cycling test.


KEY WORDS: Ischemia; Hyperemia; Interval Exercise; Cyclists; Recovery; Submaximal exercise

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