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Ischemic Preconditioning Blunts Loss of Knee Extensor Torque Complexity with Fatigue
Jamie Pethick1, Charlotte Casselton, Samantha L Winter
1Endurance Research Group, School of Sport and Exercise Sciences, University of Kent, Kent, UNITED KINGDOM.
Medicine and Science in Sports and Exercise
|August 1, 2020
Summary
Ischemic preconditioning (IPC) improves endurance by preserving muscle torque complexity during fatigue. This ergogenic aid, IPC, slows the decline in muscle complexity and neural output, enhancing performance.
Area of Science:
- Exercise Physiology
- Neuromuscular Physiology
- Sports Science
Background:
- Neuromuscular fatigue diminishes muscle torque complexity, impacting motor unit function.
- Ischemic preconditioning (IPC) is an emerging ergogenic aid with significant effects on muscular output and endurance.
Purpose of the Study:
- To test if ischemic preconditioning (IPC) can reduce the loss of muscle torque complexity caused by fatigue.
Main Methods:
- Ten healthy participants performed intermittent isometric knee extensions to task failure.
- Ischemic preconditioning (IPC) or SHAM treatments were applied before contractions.
- Muscle torque, EMG, and muscle oxygen consumption were measured; complexity was analyzed using approximate entropy (ApEn) and detrended fluctuation analysis (DFA).
Main Results:
- IPC increased time to task failure by 43%.
- The rate of decrease in muscle torque complexity (ApEn, DFA α) was significantly lower with IPC.
- IPC also slowed the increase in EMG amplitude and muscle oxygen consumption.
Conclusions:
- Ischemic preconditioning (IPC) demonstrates an ergogenic effect, likely of neural origin.
- IPC attenuates the fatigue-induced loss of muscle torque complexity.
- The findings suggest IPC influences neural control and metabolic responses during fatiguing exercise.
