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Background  The purpose of this study was to analyze the relationships between muscular performance consisting of a single repetition on the chair squat exercise (CSQ) and different measures of functional capacity, balance, quality of life and cognitive status in older adults.    Methods  A total of 40 participants (22 women, 18 men; age = 72.2 ± 4.9 years) joined the investigation. Muscular performance was assessed by measuring movement velocity in the CSQ with no external load using a validated smartphone application ( PowerLift  for iOS). Functional capacity, balance, quality of life and cognitive status were evaluated using the hand-grip strength (HGS) test, the Berg-scale, the EuroQol 5D (EQ-5D) and the Mini mental state examination questionnaire (MMSE). Finally, participants were divided into two subgroups ( N  = 20) according to their velocity in the CSQ exercise.    Results  Positive correlations were obtained between movement velocity in the CSQ and HGS ( r  = 0.76,  p  < 0.001), the Berg-scale ( r  = 0.65,  p  < 0.001), the EQ-5D ( r  = 0.34,  p  = 0.03) and the MMSE ( r  = 0.36,  p  = 0.02). Participants in the fastest subgroup showed very likely higher scores in the Berg-scale (ES = 1.15) and the HGS (ES = 1.79), as well as likely higher scores in the MMSE scale (ES = 0.69).    Discussion  These results could have potential clinical relevance as they support the use of a time-efficient, non-fatiguing test of muscular performance (i.e., the CSQ) to evaluate functional capacity and mental cognition in older adults.

Movement velocity in the chair squat is associated with measures of functional capacity and cognition in elderly people at low risk of fall