The Assessment of Muscle Strength and Cardiorespiratory Parameters Using Simple Tests in Older Adults With Recovery From Mild COVID-19.

Abstract

To evaluate muscle strength and cardiorespiratory parameters, this study uses simple tests in older adults, including those who have and have not recovered from mild coronavirus disease 2019 (COVID-19). Eighty older adults (age≥60 years old) were divided into two groups: those without previous COVID-19 (control group, n=40) and those with recovery from mild COVID-19 (recovered group, n=40). Muscle strength was assessed using a handgrip strength test and the sit-to-stand test (STS10). Cardiorespiratory parameters were evaluated with a 1-minute sitto- stand (1-min STS) test and a 6-minute walk test (6MWT). Both groups had normal values for body mass index, blood pressure, heart rate, and pulse oxygen saturation. The recovered group showed significant differences in handgrip strength test (24.73±6.99 vs. 22.03±4.36, p=0.041) and duration for the STS10 (25.15±6.11 vs. 33.40±7.56, p<0.001) when compared to the control group. Furthermore, the recovered group had significantly decreased repetitions of a 1-min STS (31.38±4.89 vs. 21.25±3.64, p<0.001) and increased the rate of perceived exertion (RPE) (7.43±1.20 vs. 8.95±1.01, p=0.01) and leg fatigue (1.49±1.13 vs. 3.00±1.04, p=0.03) after performing a 1-min STS when compared with the control group. Moreover, the recovered group had also significantly decreased distances for the 6MWT (421.68±8.28 vs. 384.35±6.17, p<0.001) and increased the post-test RPE (7.63±1.37 vs. 12.05±1.63, p<0.001) and the post-test leg fatigue (1.71±0.88 vs. 5.28±0.91, p<0.001) compared with the control group. Older adults with recovery from mild COVID-19 reported reduced muscle strength and exercise tolerance when compared with older adults without COVID-19.