Seven-day test-retest reliability of knee-extension strength using magnetic stimulation of the femoral nerve in critically-ill veterans
Method: A knee-holder device was developed to facilitate recording of knee-extension strength elicited by magnetic stimulation of the femoral nerve independent from patients’ volition. Study subjects were measured at baseline and then at follow-up seven days later in order to determine whether these measurements remain reliable.
Results: Initial knee-extension forces elicited by single stimulation and by paired stimulations delivered at 100Hz were 8.54±0.53 and 20.03±0.93 kg (mean±SE), respectively. Repeat testing at one week revealed forces of 8.33±0.74 and 20.59±0.98 kg. Intraclass-correlation coefficients of 0.94 and 0.96 (p>0.68), with respective typical percentage errors of 6.2% and 5.8% demonstrate high test-retest reliability of stimulations elicited by single and paired stimulations.
Conclusion: Measurements of knee-extension strength elicited by single and paired magnetic stimulations of the femoral nerve delivered while the leg rests upon a knee-holder device are reliable, making this technique suitable for cross-sectional and longitudinal studies. These findings help improve diagnosis of muscle strength in critically ill patients, and provide a cutting-edge, necessary resource to aid intensive care clinicians in providing optimum care.
Learning Areas:Basic medical science applied in public health
Chronic disease management and prevention
Public health biology
Public health or related research
Describe the test-retest reliability of a novel knee-holder that was developed to facilitate muscle strength testing in critically ill patients.
Keyword(s): Veterans' Health, Chronic Disease Management and Care
Qualified on the content I am responsible for because: I interned at the VA Hospital working in this field for my MPH internship over the last 12 months. I have been working closely with clinicians in this field during this time.
Any relevant financial relationships? No
I agree to comply with the American Public Health Association Conflict of Interest and Commercial Support Guidelines, and to disclose to the participants any off-label or experimental uses of a commercial product or service discussed in my presentation.