Inter-Set Blood-Flow Restriction Increases Peripheral Physiological Stress While Preserving Repeated-Sprint...

Area of Science:

• Exercise Physiology
• Sports Science
• Muscle Physiology

Background:

• Blood-flow restriction (BFR) may enhance training stimuli in athletes.
• Limited evidence exists on inter-set BFR effects during repeated-sprint exercise in trained individuals.

Purpose of the Study:

• To investigate the impact of inter-set BFR on physiological and perceptual responses during repeated-sprint cycling in trained male badminton players.
• To assess BFR's influence on mechanical output, muscle oxygenation, cardiovascular responses, and neuromuscular fatigue.

Main Methods:

• Randomized crossover design involving 26 national-level male badminton players.
• Completion of three sets of five 5-second cycling sprints with 25-second intra-set rest and 3.5-minute inter-set recovery.
• Inter-set recovery involved either BFR (130 mmHg) or sham-BFR (20 mmHg); measurements included power output, vastus lateralis muscle oxygenation (SmO2), heart rate, and perceived sensations.

Main Results:

• No significant differences in mean or peak power output or sprint decrement scores between BFR and sham-BFR conditions.
• BFR lowered muscle oxygenation recovery (SmO2) and slowed resaturation kinetics during the first two recovery periods.
• Higher leg discomfort and perceived exertion were reported with BFR, and post-exercise countermovement jump height was reduced.

Conclusions:

• Inter-set BFR increases peripheral physiological and perceptual stress and alters muscle oxygenation recovery during repeated sprints in trained athletes.
• BFR did not compromise sprint performance but induced greater neuromuscular fatigue, evidenced by reduced jump performance.
• This method may offer a practical strategy to augment training stress, but potential for increased fatigue should be considered.