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Effect of High-Intensity Inspiratory Muscle Training on Lung Volumes, Diaphragm Thickness, and Exercise Capacity in Subjects Who Are Healthy
Abstract
Background and Purpose. Previous investigations have demonstrated that a regimen of high-intensity inspiratory muscle training (IMT) resulted in changes in ventilatory function and exercise capacity in patients with chronic lung disease, although the effect of high-intensity IMT in subjects who are healthy is yet to be determined. The purpose of this study, therefore, was to examine whether high-intensity IMT resulted in changes in ventilatory function and exercise capacity in subjects who were healthy. Subjects. Twenty subjects were randomly assigned to 2 groups. Methods. The training group completed an 8-week program of IMT set at 80% of maximal effort. The control group did not participate in any form of training. Baseline and posttraining measures of body composition, pulmonary function, inspiratory muscle function (including maximal and sustained maximal inspiratory pressures [MIP and SMIP]), relaxed and contracted diaphragm thickness and thickening ratio (Tdi.rel, Tdi.cont, and TR), and exercise capacity were determined. Results. The training group demonstrated significant increases in MIP, SMIP, Tdi.cont, TR, VC, total lung capacity, and exercise capacity compared with the control group, which demonstrated no change from baseline measurements at 8 weeks. Discussion and Conclusion. The findings of this study suggest that high-intensity IMT results in increased contracted diaphragm thickness and increased lung volumes and exercise capacity in people who are healthy. [Enright SJ, Unnithan VB, Heward C, et al. Effect of high-intensity inspiratory muscle training on lung volumes, diaphragm thickness, and exercise capacity in subjects who are healthy.
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“Improvements after RMT [50,51] were even greater (approximately 25%) than those reported for physical endurance training (approximately 10% [108] ), which raises questions regarding the validity of this protocol.”
From Effect of Respiratory Muscle Training on Exercise Performance in Healthy Individuals: A Systematic Review and Meta-Analysis (2012) · cites this paper as [51]
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“Also, the studies by Enright et al. [51] and Enright and Unnithan [50] might contribute to the discrepancy between model and meta-analysis.”
From Effect of Respiratory Muscle Training on Exercise Performance in Healthy Individuals: A Systematic Review and Meta-Analysis (2012) · cites this paper as [51]
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“Without the two studies by Enright, [50,51] the overall difference between improvements in IT performance after RMT and sham/control-training is 2% -equal to that for TTs.”
From Effect of Respiratory Muscle Training on Exercise Performance in Healthy Individuals: A Systematic Review and Meta-Analysis (2012) · cites this paper as [51]
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Cited by
Lean Tissue Imaging: A New Era for Nutritional Assessment and Intervention
Prado, C. M. M., & Heymsfield, S. B. (2014) · Journal of Parenteral and Enteral Nutrition · doi:10.1177/0148607114550189 · Cited by 550
Illi, S. K., Held, U., Frank, I., & Spengler, C. M. (2012) · Sports Medicine · doi:10.1007/bf03262290 · Cited by 411
Metadata
- Authors
- Enright, S. J., Unnithan, V. B., Heward, C., Withnall, L., & Davies, D. H.
- Venue
- Physical Therapy
- Publisher
- Oxford University Press (OUP)
- Published
- 2006-03-01
- Volume
- 86
- Issue
- 3
- Pages
- 345-354
- ISSN
- 0031-9023
- 1538-6724
- Cited by
- 219
- References
- 2
- Language
- en
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