This finding was independent of time spent in moderate-vigorous activities.
These findings show a decreased risk of subsequent incident disability associated with greater daily time spent in light activities and in moderate-vigorous activities.
For analysis purposes, we determined quartile categories of time spent in light and moderate-vigorous activities by using 1680 participants without baseline disability.
A significant relation persisted after further control for time spent in moderate-vigorous activities (hazard ratios 1.00, 0.64, 0.51, and 0.67; P for trend=0.039).
As expected, we found an inverse relation between daily time spent in moderate-vigorous activities and the development of disability, consistent with the many health benefits tied to physical activity of moderate or vigorous intensity.
Similarly, we found a significant inverse graded relation between quartile categories representing more time spent in moderate-vigorous activities and disability progression, with control for socioeconomic factors, health factors, and light activity time (hazard ratios 1.00, 0.68, 0.66, and 0.41; P for trend=0.007).
Moderate-vigorous activity was correlated with reading scores.
Of note, moderate-vigorous activity approached a significant correlation (p = 0.088), although such an effect would have been small and perhaps trivial.
But they wrote, "Even a large daily dose of moderate-vigorous activity may not be sufficient to offset the adverse effects of a sedentary lifestyle".
Changes between the 2 groups in vigorous or moderate-vigorous activity were not significant.
Our results indicate that increasing light activity is also beneficial, independent of moderate-vigorous activity.
