“This study investigated whether the addition of inspiratory muscle training (IMT) to an existing program of preseason soccer training would augment performance indices such as exercise tolerance and sports-specific performance beyond the use of preseason training alone.”
Conclusion:
“There may be benefit for soccer players to incorporate IMT to their pre-season training but the effect is not conclusive. It is likely that a greater pre-season training stimulus would be particularly meaningful for this population if fitness gains are a priority and evoke a stronger IMT response.”