METHODS: The study included 25 community-dwelling older adults participants aged over 60 years (14 women and 11 men) who were not engaged in regular physical activity. The rectus femoris (RF) and vastus intermedius (VI) muscle thicknesses as well as the RF cross-sectional area (CSA) were assessed using 2D ultrasonography. The 30 Seconds Chair Stand test (30sCST) and Timed Up and Go Test (TUG) were used to assess lower body muscle power and functional mobility, respectively.
RESULTS: The QF muscle architecture showed moderate and large correlations with the 30sCST (r range = 0.45-0.67, p r range = 0.480-0.60, p R 2 = 0.45) and TUG (R 2 = 0.36). VI thickness was a significant (p R 2 = 0.20) and TUG (R 2 = 0.231). RF CSA was a significant independent predictor of the 30sCST (R 2 = 0.250, p R 2 = 0.27, p