Actigraph calibration in obese/overweight and type 2 diabetes mellitus middle-aged to old adult patients.
BACKGROUND
Several methods exist to asses and control physical intensity levels of subjects engaged in physical activities programs, accelerometry is a method that could be easily used in the field. The purposes were: to calibrate Actigraph in middle-aged to old obese/overweight and DM2 adult patients; and to determine the threshold counts for sedentary, light, moderate, and vigorous physical activity (PA).


METHODS
Sample comprise 26 participants (62.6 +/- 6.5 years of age) of both gender. Counts and VO2 were simultaneously assessed during: resting, seating, standing, walking at 2.5 km x h(-1), 5 km x h(-1), and 6 km x h(-1). A hierarchical linear model was used to derive a regression equation between MET and counts. Receiver operating characteristics (ROC) analysis was used to define thresholds for PA levels.


RESULTS
The regression equation was: MET 1.388400490262 + 0.001312683420044 (counts x min(-1)), r = .867. The threshold counts for sedentary-light, light-moderate and moderate-vigorous PA were: 200, 1240, 2400 counts-min(-1) respectively.


CONCLUSIONS
The Actigraph is a valid and useful device for the assessment of the amount of time spent in each PA intensity levels in obese/overweight and DM2 middle-aged to old adult patients.
Lopes
Vitor Pires
VP
Dept. of Sport Science, Polytechnic Institute of Bragança, Portugal.
Magalhães
Pedro
P
Bragada
José
J
Vasques
Catarina
C
D056044:Actigraphy; D000368:Aged; D002138:Calibration; D003924:Diabetes Mellitus, Type 2 / Q000534:rehabilitation*; D015444:Exercise; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000534:rehabilitation*; D050177:Overweight / Q000534:rehabilitation; D010807:Physical Endurance; D012372:ROC Curve