Individualized Estimation of Physical Activity in Older Adults with Type 2 Diabetes.

Purpose: Compare physical activity intensity in older adults with T2DM using individualized, relative cutpoints with standard, absolute cutpoints. Methods: One hundred older adults with T2DM (68.9+/-5.1y, 65% male, 32.7+/-6.3 kg.m-2, 7.2+/-1.1% HbA1c) completed a two-speed walking protocol (varying, walking between 1-2.5 mph), followed by a modified Bruce peak exercise test. Participants wore an accelerometer-based physical activity monitor at their waist and oxygen consumption was measured. Afterwards, participants wore the activity monitor for 7 consecutive days. Linear equations for each individual was derived from the activity counts and energy expenditure measured during the walking protocol. Relative intensity cutpoints were calculated by using standard classifications of 44% VO2peak to determine moderate and 59% VO2peak to determine vigorous intensity. Average time spent in intensity categories per day were calculated using relative and absolute (moderate 2020 cpm, vigorous 5999 cpm) cutpoints. T-tests were run to compare estimated time spent in intensity category by cutpoint. Results: Mean VO2peak was 17.9+/-4.5 ml.kg-1.min-1 and relative cutpoints were, on average, 1033.5(SD=741.2) cpm for moderate and 2211.7(SD=1512.4) cpm for vigorous activity. Using the relative cutpoints, participants accumulated an average of 157.2(SD=73.7) min of light, 33.3(SD=35.6) min of moderate, and 15.6(SD=26.7) min of vigorous activity per day. Use of the absolute cutpoint resulted in significantly different estimations based on intensity category: light 200.7(SD=74.7, p

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