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Relationship between Volitional and Non-Volitional Quadriceps Muscle Endurance in Patients with Chronic Obstructive
Anouk A F Stoffels1, Neeltje A E Allard2, Martijn A Spruit3,4,5
1Department of Pulmonary Diseases, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands.
Diagnostics (Basel, Switzerland)
|January 22, 2024
Summary
Volitional and non-volitional quadriceps muscle endurance tests in COPD patients showed no significant correlation. These distinct measures assess different aspects and should not be used interchangeably for assessing muscle endurance.
Area of Science:
- Pulmonary Medicine
- Exercise Physiology
- Rehabilitation Science
Background:
- Quadriceps muscle endurance is crucial for patients with chronic obstructive pulmonary disease (COPD).
- Construct validity of volitional endurance tests requires comparison with non-volitional measures, which is currently lacking.
- Understanding these differences is vital for accurate patient assessment and tailored rehabilitation strategies.
Purpose of the Study:
- To evaluate the correlation between volitional and non-volitional quadriceps muscle endurance in COPD patients.
- To determine if volitional tests can serve as reliable proxies for non-volitional assessments in this population.
- To clarify the distinct physiological aspects measured by each testing modality.
Main Methods:
- Twenty-six COPD patients underwent volitional isometric and isokinetic quadriceps muscle endurance tests using a dynamometer.
- Non-volitional endurance was assessed via electrical stimulation to measure isometric muscle force decline.
- Sixteen patients completed all tests, with data analyzed for correlations between measures.
Main Results:
- No significant correlation was found between volitional isometric time and non-volitional muscle force decline (p > 0.05).
- Similarly, the isokinetic work fatigue index did not significantly correlate with non-volitional muscle force decline (p > 0.05).
- A strong correlation was observed between the two volitional measures (isometric time and isokinetic work fatigue index; rho = -0.716, p = 0.002).
Conclusions:
- Volitional and non-volitional quadriceps muscle endurance assessments capture different physiological components.
- Current volitional measures cannot be used interchangeably with non-volitional measures for COPD patients.
- Further research is needed to refine and validate specific testing protocols for clinical use.
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