Impact of Moderate and High-Intensity Inspiratory Muscle Training on VO₂max and Maximal Inspiratory Pressure in Healthy Adults

Authors

Amy Toonstra PT, DPT, Concordia University, St. PaulFollow
C Birch
C DeBettignies
E Frommelt
C Henjum
D Langenfeld
M Wallmow

Document Type

Poster

Publication Date

2024

Abstract

Introduction

• Exercise capacity is limited by onset of diaphragm fatigue during high-intensity exercise due to respiratory metaboreflex
• Inspiratory muscle training (IMT) delays metaboreflex, improves maximal inspiratory pressure (MIP) at moderate intensities^1-6
• Optimal training loads remain unclear --training at 50% 1RM does not meet ACSM standard for strengthening at 80% 1RM^7-10

Objective

• Investigate the effects of IMT at moderate (50%) versus high (80%) resistance on maximal inspiratory pressure and VO₂max in healthy adults

Methods

• Double blind pre-test/ post-test randomized group design was used
• 2x2 ANOVA for pre/post MIP and VO₂max using SPSS

Results

• Following 8-week trial, both groups showedsignificant increase in MIP (p =
• No significant increase in VO₂max (p = 0.729) or difference between groups (p=0.303)

Conclusion

• IMT at high-and moderate-intensity improves MIP
• IMT performed at high-intensity does not appear more effective at improving MIP than moderate-intensity training
• VO₂max did not significantly improve in either group

Clinical Relevance

• IMT at ≥ 50% can maintain or decrease deconditioning of the diaphragm in sedentary or athletic individuals unable to fully exercise due to injury
• Further research is needed to evaluate effects on individuals with sedentary lifestyles

Recommended Citation

Toonstra, Amy PT, DPT; Birch, C; DeBettignies, C; Frommelt, E; Henjum, C; Langenfeld, D; and Wallmow, M, "Impact of Moderate and High-Intensity Inspiratory Muscle Training on VO₂max and Maximal Inspiratory Pressure in Healthy Adults" (2024). DPT Capstone Posters. 35.
https://digitalcommons.csp.edu/dpt-posters/35