Abstract
Bioimpedance (BIA) phase angle (PA) is a body composition measure related to cell structure, integrity and body cell mass. Although PA has been positively correlated to clinical outcomes, there is scarce information on ethnic differences in PA and its overall reliability. PURPOSE: To determine phase angle reliability in Mexican college students. METHODS: College students from the city of Tijuana, México, were recruited for this study. Volunteers were 26 males (Age = 22.7 ± 3.1 yr., Height = 172.8 ± 5.6 cm, Weight = 70.9 ± 11.7 kg) and 26 females (Age = 21.1 ± 2.2 yr., Height = 159.0 ± 7.1 cm, Weight = 60.8 ± 8.6kg). Participants arrived euhydrated to the testing session (Urine specific gravity = 1.005 ± 0.003) and were measured on a multi-frequency InBody 770 BIA device in two occasions separated by five minutes of seated resting. Body weight, %fat mass, muscle mass (kg) and PA were recorded and analyzed by repeated measures 2 (gender) x 2 (measures) ANCOVA, using hydration status and age as covariates. Intraclass correlation coefficient (ICC) and 95% confidence interval were used to determine reliability between measures. RESULTS: Gender differences were found on PA (Males = 6.8 ± 0.1 vs. Females = 5.9 ± 0.1, p ≤ 0.0001), and muscle mass (Males = 31.9 ± 0.7 vs. Females = 23.2 ± 0.7 kg, p ≤ 0.0001). Significant (p ≤ 0.0001 for all) ICC reliability coefficients were found between pre- to post-measures of PA (r = 0.998, 95%CI = 0.996 to 0.999), %fat (r = 0.999, 95%CI = 0.998 to 1.00) and muscle mass (r = 1.00, 95%CI= 1.00 to 1.00). CONCLUSION: Young college students showed reliable BIA PA, muscle mass and %fat values following five minutes of seated resting. Mexican males showed higher muscle mass and PA than women after controlling for the influence of hydration and age.
Published Version
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