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Effects of Inspiratory Muscle Training on Whole Body Exercise Performance in Males: 1179: Board #5 May 30 9:30 AM ‐ 11:30 AM

Babcock, Mark A.; Sturch, Erin; Brunton, Chase; Thomas, Amy

Medicine & Science in Sports & Exercise: May 2007 - Volume 39 - Issue 5 - p S150
doi: 10.1249/01.mss.0000273538.21992.d5
Thematic Poster Session Format: First 30 minutes of session - View posters Remaining 90 minutes of session - Chair leads discussion: A-21 Thematic Poster - Inspiratory Muscle Training: MAY 30, 2007 9:30 AM - 11:30 AM ROOM: 334

Wilfrid Laurier University, Waterloo, ON, Canada.

Email: mbabcock@wlu.ca

It has been shown in humans that following a bout of whole body endurance exercise at intensity level greater than 85% VO2 max the diaphragm response to supramaximal electrical stimulation was substantially lower compared to the pre-exercise response. This fatigue of the major inspiratory muscle could potentially be limiting to intense whole body exercise performance.

PURPOSE: To examine the effects of inspiratory muscle training (IMT) on whole body exercise performance time.

METHODS: Forty male subjects Gave informed consent and were randomly placed in four groups; a control group (N=10, CON), an inspiratory muscle training group (N=10, IMT), a whole body exercise group (N=10, WB), and a group doing whole body training followed by inspiratory muscle training (N=10, WB+IMT). WB training consisted of 10–20 minute on a cycle ergometer working at 90% VO2max. IMT required the subject to inspire against a resistive load set at 50% of the subjects measured maximal inspiratory pressure (MIP). The subject performed 30 maximal efforts at this load followed by a 10 minute break and then performed 30 more maximal efforts. The training sessions were done three times per week for six weeks. Pre and post training testing consisted of an incremental cycle ergometer test to determine VO2max and two 10 kilometer time trials (10 KmTT) on a cycle ergometer. The time to complete the 10 Km TT was used as the indication of performance. Comparisons of performance time were made between pre vs. post -training within a group and between groups.

RESULTS: The post-training performance times were significantly reduced for the IMT(97% of pre-training time), WB (96% of pre-training time) and WB+IMT(92% of pre-training time) groups versus pre-training times (p<0.05). The largest decrease in performance time was found in the WB+IMT group (8% lower vs. pre-training) and was substantially different vs. WB (4% lower) and IMT groups (3% lower) (p<0.05).

CONCLUSION: Improvements in whole body exercise performance due to IMT program may be enhanced by preceding the IMT training session with a short bout of intense whole body exercise.

© 2007 American College of Sports Medicine