Butts, C. J., Swenson, T., & Pfaff, T. (2005). Effect of respiratory muscle training on 20 km cycling time-trial performance. Medicine and Science in Sports and Exercise, 37(5), Supplement abstract 425.

Trained cyclists (N = 10) were assigned randomly to an experimental or control group. The experimental group (N = 5) trained twice a day with the PowerlungTM, while the control group trained once a day with a sham device. Thirty repetitions were completed each training session for six weeks.

Training improved inspiratory muscle strength and respiratory muscle endurance. Ratings of perceived exertion were lowered in the time trial. Maximal, sub-maximal, and 20 km time-trial performance were not improved by respiratory training.

Implication. Respiratory muscle training improves respiratory muscle function but does not translate into improved cycling performance over a 20 km time-trial.

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