Association of vitamin D level, leg extensor power, and neuromuscular function in mobility‐limited older adults (863.7)

Abstract

Purpose: Low vitamin D level is associated with poor muscle strength in older adults, but little is known about its relationship with muscle power and neuromuscular function in a mobility‐limited population. This study examines the cross‐sectional relationship between vitamin D level, leg power, and neuromuscular activation in mobility‐limited older adults.Methods: Sixty‐two mobility‐limited older adults completed the study (age= 77.2±4.7 years; Short Physical Performance Battery score = 7.8±1.2). Leg extensor peak power was assessed using bilateral leg press exercise and rate of vastus lateralis neuromuscular activation was assessed using surface electromyography.Results: As vitamin D level increased, a decrease was seen in muscle power (r= ‐0.27, p= .04) and neuromuscular activation (r= ‐.45, p= .06). Neuromuscular activation was significantly higher in subjects with vitamin D <30 ng/ml compared to those 蠅30 (.24±.09 vs. .11±.14, respectively; p= .02).Conclusion: This data suggests a negative association between vitamin D level, leg power and neuromuscular function, though further analysis is needed to confirm these findings.Grant Funding Source: USDA (58‐1950‐0‐014)