Is There an Optimal Ischemic-Preconditioning Dose to Improve Cycling Performance?

Area of Science:

• Exercise Physiology
• Sports Science
• Human Performance

Background:

• Ischemic preconditioning (IPC) is a potential strategy to enhance endurance performance.
• Optimal IPC protocols for maximizing endurance benefits remain underexplored.

Purpose of the Study:

• To compare distinct Ischemic Preconditioning (IPC) protocols to determine the optimal method for improving cycling performance.
• Investigate the impact of varying cycle numbers, muscle tissue involvement (local vs. remote), and occlusion site.

Main Methods:

• Twelve cyclists completed five different IPC protocols before a 375-kJ cycling time trial.
• Protocols included traditional IPC (4x5-min legs), increased cycles (8x5-min legs), sham, unilateral legs, and remote arm occlusion.
• Performance metrics (power, heart rate, oxygen uptake) and physiological markers (perceived exertion, blood lactate) were continuously monitored.

Main Results:

• The traditional 4x5-min IPC protocol resulted in a 17-second faster time trial compared to sham.
• Increasing the number of IPC cycles or using unilateral limb occlusion did not improve performance.
• Remote and local IPC protocols yielded similar time trial results.

Conclusions:

• The standard 4x5-minute Ischemic Preconditioning (IPC) protocol, applied either locally or remotely, is most effective for improving cycling time trial performance.
• Increasing IPC cycle duration or using unilateral application does not provide additional endurance benefits.