Seven-day ischaemic preconditioning improves muscle efficiency during cycling

Area of Science:

• Exercise Physiology
• Sports Science
• Cardiovascular Research

Background:

• Ischaemic preconditioning (IPC) is a potential non-invasive ergogenic aid.
• Repeated IPC has shown clinical efficacy.
• Its effects on endurance performance and muscle efficiency require investigation.

Purpose of the Study:

• To investigate the effect of repeated IPC on endurance cycling performance.
• To assess the impact of repeated IPC on muscle efficiency.

Main Methods:

• Twenty participants underwent 7-day repeated lower limb occlusion (IPC: 220 mmHg, Sham: 20 mmHg).
• Performance was assessed via submaximal cycling tests (70-90% VT) and an incremental exercise test.
• Muscle efficiency (GE, DE) and muscle oxygenation (HHb, tHb) were measured.

Main Results:

• IPC did not affect maximal oxygen uptake (VO2max).
• Time to exhaustion increased by ~9% and maximal power output (Wmax) by ~5% (P=0.002).
• Delta efficiency (DE) increased by 3.1% (P=0.011), and deoxyhaemoglobin (HHb) decreased by ~30% (P=0.017).

Conclusions:

• Repeated IPC over 7 days enhances muscle efficiency and extends endurance cycling performance.
• Physiological adaptations in skeletal muscle efficiency contribute to performance improvements.
• IPC represents a promising ergogenic strategy for endurance athletes.