Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2024) 23, 799 - 811   DOI: https://doi.org/10.52082/jssm.2024.799

Research article
Effect of Ischemic Preconditioning on Endurance Running Performance in the Heat
Anjie Wang1,2, Chansol Hurr2, 
Author Information
1 Department of Physical Education, Anhui Polytechnic University, Wuhu, China
2 Integrative Exercise Physiology Laboratory, Department of Physical Education, Jeonbuk National University, Jeonju, South Korea

Chansol Hurr
✉ Ph.D. Associate Professor, Department of Physical Education, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do, 54896, South Korea
Email: chansolh@jbnu.ac.kr
Publish Date
Received: 11-06-2024
Accepted: 08-10-2024
Published (online): 01-12-2024
 
 
ABSTRACT

Ischemic preconditioning (IPC) is a strategy that may enhances endurance performance in thermoneutral environments. Exercising in the heat increases thermoregulatory and cardiovascular strain, decreasing endurance performance. The current study aimed to determine whether IPC administration improves endurance performance in the heat. In a randomized crossover design, 12 healthy subjects (V̇O2max: 54.4 ± 8.1 mL·kg-1·min-1) underwent either IPC administration (220 mmHg) or a sham treatment (20 mmHg), then completed a moderate-intensity 6-min running (EX1) and a high-intensity time-to-exhaustion running test (EX2) in a hot environment (35 °C, 50 % RH). Cardiac function, oxygen consumption (V̇O2), and core body temperature (TCORE) were measured. During EX2, IPC administration increased the total running time in the heat compared to the sham treatment (IPC: 416.4 ± 61.9 vs. sham 389.3 ± 40.7 s, P = 0.027). IPC administration also increased stroke volume (IPC: 150.4 ± 17.5 vs. sham: 128.2 ± 11.6 ml, P = 0.008) and cardiac output (IPC: 27.4 ± 1.7 vs. sham: 25.1 ± 2.2 ml min-1, P = 0.007) during 100% isotime of EX2. End-exercise V̇O2 (IPC: 3.72 ± 0.85 vs. sham: 3.54 ± 0.87 L·min-1, P = 0.017) and slow phase amplitude (IPC: 0.57 ± 0.17 vs. sham: 0.72 ± 0.22 L·min-1, P = 0.016) were improved. When compared with the baseline period, an increase in TCORE was less in the IPC condition during EX1 (IPC: 0.18 ± 0.06 vs. sham: 0.22 ± 0.08 °C, P = 0.005) and EX2 (IPC: 0.87 ± 0.10 vs. sham: 1.03 ± 0.10 °C, P < 0.001). IPC improves high-intensity endurance performance in the heat by 6.9 %. This performance benefit could be associated with improved cardiac and thermoregulatory function engendered by IPC administration.

Key words: IPC, heat stress, aerobic performance, cardiac function, thermoregulation


           Key Points
  • Ischemic preconditioning administration improved high-intensity endurance performance in the heat by 6.9 % compared to the sham treatment, with 8 out of 12 subjects performing better after IPC administration.
  • The performance benefit could be associated with improved cardiac and thermoregulatory functions during high-intensity exercise after IPC administration.
  • The enhanced cardiac function was not observed during moderate-intensity exercise, indicating that the effects of IPC intervention in hot environments depend on the exercise intensity.
 
 
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