Eighteen-Month Changes in Physical Activity, Body Weight, Quadriceps Strength, and Gait Biomechanics during the COVID-19 Pandemic.

Muscle strength Over 18 months, mean maximum voluntary isometric knee extensor strength decreased from 3.73 ± 0.73 to 3.44 ± 0.52 (N·m)·kg −1 (or by 6.4% ± 11.5%), although this change did not reach statistical significance ( P = 0.071) likely because of the small sample size and large interindividual differences.

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Results At follow-up, participants spent less time doing vigorous physical activity (∆ = −76 ± 157 min·wk −1 , P = 0.048), exhibited a tendency toward increased sedentary time (∆ = +120 ± 162 min·d −1 , P = 0.056), weighed more (∆ = +2.5 ± 2.8 kg, P = 0.021), and showed a trend toward reduced quadriceps strength (∆ = −0.29 ± 0.45 (N·m)·kg −1 , P = 0.071) compared with baseline.

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