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Table 2 Number of complete data acquisition days needed to predict 21 days of physical activity behavior from objective and subjective methodologies as determined by Spearman Brown Prophecy Formula.

From: How many days of monitoring predict physical activity and sedentary behaviour in older adults?

 

ActiGraph 7164

Yamax SW-200

Physical activity log

Reliability Value

0.80

0.85

0.90

0.95

0.80

0.85

0.90

0.95

0.80

0.85

0.90

0.95

Total PA

3

4

6

13

4

6

10

21

4

5

8

18

Sedentary Behavior

5

7

11

21

--

--

--

--

--

--

--

--

Light-Intensity PA

3

4

7

14

--

--

--

--

14

20

21

21

Moderate-Intensity Lifestyle PA

2

3

5

10

--

--

--

--

--

--

--

--

MVPA

2

3

5

10

--

--

--

--

5

7

12

21

  1. Note. Physical activity (PA); moderate-to vigorous-intensity physical activity (MVPA)
  2. Note. ActiGraph cutpoints used for this analysis were 0-50 counts/min = sedentary behavior; 51-759 counts/min = light intensity physical activity; 760-1951 = moderate lifestyle physical activity; ≥1952 = moderate-to-vigorous physical activity (Crouter et al., 2006; Matthews, 2005; Freedson et al., 1998). For the PA log, Light PA = activities ranging from 1-2.99 METs and MVPA = activities ≥3 METs (Pate et al., 1995).
  3. Note. Physical activity log light intensity physical activity is inclusive of sedentary behavior