Background

As individuals age body composition changes. Most physical function test are useful tools in elderly, however, how useful may be in sedentary young and middle-age adults with different body composition has not been studied

Methods

A Cross-sectional and analytic study, 110 patients from 20-55 years old, sedentary who underwent initial evaluation at our center including 5 stages of BMI (normal weight, overweight, obesity class I, II and II). Patients without independent gait or with gait impairments were excluded, also patients with visual or auditive deficits with balance impairments. Body composition was calculated by dual energy X-ray absorptiometry.Physical function was assessed using five different tests: sock test, single leg stance, 30 sec sit to stand, time up & go, 6 min walk test. Pearson and Spearman tests were used for correlations between dimensional continuous variables

Results

110 patients, 50.9% female, mean age 38.3 ± 9.55 years, body weight 96.99 ± 23.87, BMI 34.82±7.26, According OMS BMI classification: 9.1% had normal weight, 23.6% were overweight, 23-6% obesity I, 20.9% obesity II, 22.7% obesity III. Waist hip index 0.9179±0.112, fat mas index 14.66 ± 4.98, free fat mass index 18.34 ± 2.95, appen lean index 7.90± 1.44. There was a significant correlation between physical function with BMI and FMI through all tests: strong for the sock test, moderate for single leg stance, time up & go and 6 min walk test, and small for 30 sec sit to stand. Between FFMI and physical function there was moderate correlation with sock test, small for single leg stance and 6 min walk test and very small for 30 sec sit to stand.

Conclusions

Among sedentary young and middle-age adults higher BMI and FMI is associated with lower physical function. Increased FFMI was associated with better physical function.Its important to incorporate this tests to evaluate and prescribe individualized exercise to preserve physical function.