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Diaphragm Contractility in Individuals with Chronic Ankle Instability.
Masafumi Terada1, Kyle B Kosik, Ryan S McCann
11College of Sport and Health Science, Ritsumeikan University, Kusatus, Shiga, JAPAN; and 2Department of Rehabilitation Science, University of Kentucky, Lexington, KY.
Medicine and Science in Sports and Exercise
|May 28, 2016
Summary
Individuals with chronic ankle instability (CAI) show reduced left diaphragm contractility, suggesting potential diaphragm dysfunction and central nervous system changes. This finding highlights proximal impairments in CAI patients.
Area of Science:
- Biomechanics
- Neuromuscular Function
- Musculoskeletal Rehabilitation
Background:
- Chronic ankle instability (CAI) is linked to impaired trunk and postural stability.
- The diaphragm plays a crucial role in trunk stability via intra-abdominal pressure modulation.
- Altered diaphragm function may underlie stability deficits in CAI due to sensorimotor changes.
Purpose of the Study:
- To investigate diaphragm contractility in individuals with CAI compared to healthy controls.
- To explore potential links between CAI and altered diaphragm function.
Main Methods:
- Ultrasound imaging assessed right and left hemidiaphragm thickness and contractility in 27 CAI participants and 28 controls.
- Measurements were taken in a supine position during quiet breathing.
- Independent t-tests compared diaphragm contractility between groups.
Main Results:
- The CAI group exhibited significantly lower left hemidiaphragm contractility than the control group (P = 0.03).
- No significant differences were found in other measured diaphragm variables between groups.
Conclusions:
- Individuals with CAI demonstrate altered diaphragm contractility, potentially indicating diaphragm dysfunction and central nervous system adaptations.
- These findings suggest proximal impairments associated with CAI, warranting further research into the functional impact of diaphragm alterations.
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