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Effects of ischemic pre-conditioning on electrically stimulated contractions
Ruben Allois1,2, Pasquale Pagliaro2, Ermini Leonardo1
1Laboratory of Integrative Physiology, Department of Neuroscience, University of Torino, c.so Raffaello 30, 10125, Turin, Italy.
European Journal of Applied Physiology
|August 21, 2024
Summary
Ischemic pre-conditioning (IPC) does not enhance muscle force during electrically stimulated contractions. Its ergogenic effects in sports performance are likely not due to improved muscle contractility.
Area of Science:
- Exercise Physiology
- Muscle Physiology
- Sports Science
Background:
- Ischemic pre-conditioning (IPC) is known to protect against ischemia and may enhance sports performance.
- Potential mechanisms involve local and systemic effects, including muscle contractility.
Purpose of the Study:
- To investigate the local effects of IPC on muscle contractility.
- To assess changes in electrically induced muscle contractions, excluding motor drive variations.
Main Methods:
- Twenty-one subjects underwent IPC or SHAM treatment (ischemia/reperfusion).
- Adductor pollicis muscle contractions were induced via ulnar nerve stimulation (single pulses, trains, bursts).
- Isometric force, EMG, and tissue oxygenation were monitored before and after treatment.
Main Results:
- A time-dependent decrease in force was observed at higher stimulation frequencies (8-12 Hz).
- Half-relaxation time decreased in single twitches and bursts, irrespective of treatment.
- IPC showed a more pronounced time-related weakening at 5 Hz compared to SHAM; no effects on EMG magnitude.
Conclusions:
- IPC does not increase muscle force in electrically stimulated contractions.
- The ergogenic effects of IPC are unlikely mediated by enhanced muscle contractility.
