Ischemia during rest intervals between sets prevents decreases in fatigue during the explosive squat exercise: a...

Area of Science:

• Exercise Physiology
• Sports Science
• Muscle Physiology

Background:

• Resistance training aims to improve strength and power.
• Intermittent application of ischemia and reperfusion is a novel strategy explored for performance enhancement.
• Understanding the effects of ischemia on power output during resistance exercise is crucial for optimizing training protocols.

Purpose of the Study:

• To evaluate the impact of intermittent ischemia applied before lower limb resistance exercise sets on power output.
• To determine if ischemia can mitigate the decline in power output during repeated sets of resistance exercise.
• To investigate the efficacy of a specific ischemia-reperfusion protocol (4.5 min ischemia + 0.5 min reperfusion) on exercise performance.

Main Methods:

• Ten healthy, resistance-trained males participated in a randomized crossover study.
• Participants performed a squat exercise protocol (5 sets of 2 repetitions at 60% 1RM) under two conditions: with intermittent ischemia and without (control).
• Ischemia was applied at 60% of arterial occlusion pressure for 4.5 minutes before each set, followed by 30 seconds of reperfusion.

Main Results:

• No significant increase in power output was observed with the ischemia condition compared to the control.
• A statistically significant interaction effect and main effect of condition were found for power output.
• Power output significantly declined in sets 3, 4, and 5 in the control condition compared to the ischemia condition, indicating reduced fatigue with ischemia.

Conclusions:

• Intermittent ischemia applied before resistance exercise sets does not enhance peak power output.
• However, this ischemia-reperfusion protocol effectively diminishes the decline in power output in later sets, suggesting a fatigue-mitigating effect.
• Repeated ischemia with reperfusion between sets may serve as a performance enhancement strategy by reducing fatigue during resistance exercise.