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Ischaemic preconditioning blunts exercise-induced mitochondrial dysfunction, speeds oxygen uptake kinetics but does
Donald L Peden1, Emma A Mitchell1, Stephen J Bailey1
1School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, UK.
Experimental Physiology
|August 28, 2022
Summary
Ischaemic preconditioning (IPC) improved oxygen uptake kinetics during intense exercise but did not enhance severe-intensity exercise performance in recreationally active individuals. This novel priming strategy did not support improved exercise capacity.
Area of Science:
- Exercise Physiology
- Mitochondrial Function
- Human Performance
Background:
- Ischaemic preconditioning (IPC) is explored as a pre-exercise strategy.
- Its effects on exercise performance and physiological responses are not fully understood.
Purpose of the Study:
- To investigate the impact of IPC on severe-intensity exercise performance.
- To examine changes in pulmonary oxygen uptake kinetics and mitochondrial respiration.
Main Methods:
- Eight men underwent either IPC or a sham-control (SHAM) procedure.
- Participants performed a severe-intensity cycling time-to-exhaustion test.
- Muscle biopsies were analyzed for mitochondrial respiration.
Main Results:
- IPC expedited pulmonary oxygen uptake kinetics and reduced exercise-induced mitochondrial leak respiration.
- No significant differences in time to exhaustion were observed between IPC and SHAM.
- Mitochondrial respiratory function and muscle oxygenation did not differ significantly.
Conclusions:
- IPC enhances oxygen uptake kinetics and mitigates mitochondrial dysfunction during severe exercise.
- IPC does not improve severe-intensity exercise performance in recreationally active individuals.
