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

Table 4 Daily estimated time spent in physical activity intensities by ActiGraph (minutes/day) and physical activity log (MET-min/day).

	Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
Sedentary Behavior* (min/day)²	424.7 (392.7, 456.7)	412.3 (382.7, 441.9)	421.1 (389.1, 453.1)	437.1 (406.4, 467.7)	427.8 (395.9, 459.7)	423.1 (390.6, 455.6)	412.9 (381.6, 444.3)
Light PA* (min/day)²	309.3 (285.4, 333.1)	313.5 (291.1, 335.8)	312.6 (293.6, 331.6)	312.3 (291.2, 333.4)	314.5 (292.0, 337.9)	313.4 (291.2, 335.6)	324.1 (301.0, 347.1)
Sed/Light PA^† (MET-min/day)³	713.2 (493.1, 971.3)	781.1 (596.6, 983.8)^a	710.4 (556.3, 942.5)^a	682.1 (559.7, 1075.6)^a	692.5 (569.7, 925.3)	749.2 (550.8, 1008.8)^a	735.0 (568.2, 1083.3)^a
Moderate Lifestyle PA^† (min/day)²	64.5 (35.6, 92.6)^c,d,e,f	75.3 (45.3, 110.9)^c,e,f,g	68.3 (48.1, 98.7)^a	60.0 (40.2, 104.7)^b	79.9 (64.9, 95.0)^a,b	67.0 (36.4, 108.5)^a,c	69.25 (37.1, 113.4)^c
MVPA^† (min/day)²	12.3 (4.5, 25.3)	15.7 (6.5, 39.0)	13.7 (6.5, 25.7)	15.0 (7.7, 31.5)	12.0 (5.2, 30.0)	13.0 (6.8, 29.8)	14.7 (7.5, 27.8)
MVPA^† (MET-min/day) ³	143.5 (57.8, 363.9)	249.1 (78.1, 474.4)	227.0 (92.5, 404.3)	223.0 (77.6, 329.7)	282.0 (159.5, 515.8)	278.0 (112.8, 478.0)	270.9 (97.5, 455.0)

Note. Data presented represent the average value for each day of the week calculated from original 21 days of data. Data are presented as *mean (95% confidence interval) or ^†median (interquartile range).
Note. ², ActiGraph data; ³, Physical Activity Log data
Note. Physical activity (PA); moderate-to-vigorous physical activity (MVPA). 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.[15]; Matthews [17]; Freedson et al.[8]).
Note. For the PA log, sedentary behavior/light intensity physical activity (Sed/Light PA); moderate-to vigorous intensity physical activity (MVPA). Sed/Light PA = activities ranging from 1-2.99 METs and MVPA = activities ≥3 METs. (Pate et al.[18])
Note. Superscript 'a' represents days which are significantly different from Sunday; 'b' represents different from Monday; 'c' represents different from Tuesday; 'd' represents different from Wednesday; 'e' represents different from Thursday; 'f' represents different from Friday; and 'g' represents different from Saturday. Significant differences determined using Repeated Measures Analysis of Variance (^†log transformation was used on data for all days for analysis where data were non-normally distributed). p < .05 was used for statistical significance.

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