Isocapnic hyperpnea training improves performance in competitive male runners

Area of Science:

• Exercise Physiology
• Respiratory Training
• Sports Performance

Background:

• Competitive runners often seek methods to enhance ventilatory system efficiency and endurance.
• Voluntary isocapnic hyperpnea (VIH) is a training technique that involves breathing against resistance.
• The long-term effects of VIH on running performance and physiological parameters require further investigation.

Purpose of the Study:

• To investigate the effects of voluntary isocapnic hyperpnea (VIH) training on ventilatory function and running performance in male competitive runners.
• To assess the durability of these effects over a 3-month maintenance period with reduced training frequency.

Main Methods:

• 15 male competitive runners underwent a 4-week VIH training program (10 hours total).
• A control group (n=7) performed sham-VIH.
• Measurements included respiratory parameters (VC, FEV1, MVV, mouth pressures), VO2max, running times, and physiological markers (lactate, cardiac output) before and after training, with follow-ups.

Main Results:

• VIH training significantly improved maximal voluntary ventilation (MVV) by 10% and respiratory endurance by 208%.
• Treadmill run time to exhaustion at 80% VO2max increased by 50%, with reduced respiratory frequency, ventilation, oxygen consumption, and lactate.
• A 4-mile run time improvement of 4% was observed post-VIH, maintained for 3 months with reduced training frequency; no improvements were seen in the control group.

Conclusions:

• Voluntary isocapnic hyperpnea training enhances respiratory muscle strength and endurance, leading to significant improvements in running performance.
• The performance benefits of VIH training are evident shortly after training cessation and can be sustained with a reduced maintenance regimen.
• Improvements are attributed to enhanced respiratory function rather than changes in oxygen delivery or psychological factors.