Objectively Measured Physical Activity Is Associated with Brain Volumetric Measurements in Multiple Sclerosis

Table 1

Descriptive statistics for accelerometry, levels of physical activity, and scaled composite volumes of normalized brain volume measures in 39 persons with MS.

Variable	Mean (standard deviation)	Range
Days of valid accelerometer data (days)	6.1 (0.9)	4.0–7.0
Accelerometer wear time (min/day)	805 (78)	681–1010
Sedentary behavior (min/day)	594 (123)	407–1048
Light physical activity (min/day)	213 (83)	60–427
MVPA (min/day)	11.9 (15.4)	0.3–53.8
NGMV (mm^3)	670873 (55423)	528164–784446
NWMV (mm^3)	725122 (62592)	603643–848542
Hippocampus (mm^3)	4214 (864)	2277–5591
Thalamus (mm^3)	8571 (1222)	6265–10712
Caudate (mm^3)	4020 (740)	2235–5349
Pallidum (mm^3)	1868 (265)	1237–2261
Putamen (mm^3)	5208 (905)	3209–6465

Note: MVPA = moderate-to-vigorous physical activity; NGMV = normalized gray matter volume; NWMV = normalized white matter volume.