Table 5.
Absolute and relative reliability, minimal detectable change and responsiveness of computed activity outputs (of an average of three valid days) from each activity tracker and ActiGraph in free-living conditions.
| Mean (SD), Day 1–3 |
Mean (SD), Day 4–6 | Systematic Difference | ICC2,1
(95% CI) |
SEM | MDC | ES | GR | |
|---|---|---|---|---|---|---|---|---|
| Polar Vantage M (n = 12) | ||||||||
| steps | 14453 | 14320 | F (1,11) = 0.021, | 0.82 | 2229 | 6178 | 0.028 | 0.060 |
| (4668) | (5665) | p = 0.887, ηp2 = 0.002 | (0.48, 0.94) | |||||
| active kcal | 1365 | 1398 | F (1,11) = 0.361, | 0.86 | 133 | 368 | 0.102 | 0.248 |
| (322) | (393) | p = 0.560, ηp2 = 0.032 | (0.59, 0.96) | |||||
| SB (mins) | 427 | 430 | F (1,10) = 0.027, | 0.78 | 53 | 147 | 0.029 | 0.056 |
| (102) | (124) | p = 0.873, ηp2 = 0.003 | (0.37, 0.94) | |||||
| LIPA (mins) | 327 | 346 | F (1,11) = 1.099, | 0.43 | 43 | 120 | 0.345 | 0.440 |
| (55) | (59) | p = 0.317, ηp2 = 0.091 | (−0.16, 0.79) | |||||
| MIPA (mins) | 221 | 222 | F (1,11) = 0.002, | 0.90 | 33 | 91 | 0.010 | 0.030 |
| (100) | (106) | p = 0.966, ηp2 = 0.000 | (0.69, 0.97) | |||||
| VIPA (mins) | 28 | 26 | F (1,11) = 0.132, | 0.83 | 12 | 34 | 0.077 | 0.162 |
| (26) | (34) | p = 0.723, ηp2 = 0.012 | (0.52, 0.95) | |||||
| sleep (mins) | 411 | 434 | F (1,8) = 4.217, | 0.75 | 24 | 66 | 0.371 | 0.963 |
| (62) | (63) | p = 0.074, ηp2 = 0.345 | (0.230, 0.94) | |||||
| Garmin Vivoactive 4s (n = 7) | ||||||||
| steps | 7695 | 7781 | F (1,6) = 0.006, | 0.24 | 2116 | 5864 | 0.053 | 0.041 |
| (1608) | (3029) | p = 0.942, ηp2 = 0.001 | (−0.56, 0.81) | |||||
| active kcal | 311 | 367 | F (1,6) = 0.981, | 0.54 | 104 | 289 | 0.718 | 0.536 |
| (78) | (205) | p = 0.360, ηp2 = 0.140 | (−0.26, 0.90) | |||||
| int mins | 9 | 10 | F (1,6) = 0.001, | 0.06 | 11 | 31 | 0.083 | 0.090 |
| (12) | (11) | p = 0.982, ηp2 = 0.000 | (−0.68, 0.73) | |||||
| sleep (mins) | 482 | 501 | F (1,5) = 0.030, | 0.61 | 45 | 125 | 0.188 | 0.422 |
| (101) | (53) | p = 0.869, ηp2 = 0.006 | (−0.27, 0.93) | |||||
| Garmin Vivosport (n = 11) | ||||||||
| steps | 9327 | 8601 | F (1,10) = 0.456, | 0.66 | 2521 | 6987 | 0.174 | 0.288 |
| (4167) | (4418) | p = 0.515, ηp2 = 0.044 | (0.13, 0.89) | |||||
| active kcal | 623 | 495 | F (1,10) = 4.815, | 0.66 | 137 | 380 | 0.612 | 0.933 |
| (209) | (259) | p = 0.053, ηp2 = 0.325 | (0.13, 0.90) | |||||
| int mins | 18 | 23 | F (1,10) = 1.107, | 0.86 | 11 | 29 | 0.208 | 0.475 |
| (24) | (31) | p = 0.317, ηp2 = 0.100 | (0.55, 0.96) | |||||
| sleep (mins) | 474 | 464 | F (1,9) = 1.131, | 0.71 | 45 | 125 | 0.132 | 0.222 |
| (76) | (97) | p = 0.315, ηp2 = 0.112 | (0.19, 0.92) | |||||
| ActiGraph (n = 39) | ||||||||
| Steps | 8424 | 8468 | F (1,38) = 0.008, | 0.75 | 2037 | 5646 | 0.012 | 0.022 |
| (3696) | (4355) | p = 0.927, ηp2 = 0.000 | (0.57, 0.86) | |||||
| active kcal | 549 | 512 | F (1,38) = 2.182, | 0.87 | 109 | 303 | 0.120 | 0.338 |
| (309) | (303) | p = 0.148, ηp2 = 0.054 | (0.77, 0.93) | |||||
| SB (mins) | 624 | 632 | F (1,38) = 0.381, | 0.90 | 38 | 106 | 0.071 | 0.210 |
| (112) | (124) | p = 0.381, ηp2 = 0.020 | (0.81, 0.94) | |||||
| LIPA (mins) | 307 | 290 | F (1,38) = 3.779, | 0.82 | 38 | 104 | 0.202 | 0.452 |
| (84) | (93) | p = 0.059, ηp2 = 0.090 | (0.68, 0.90) | |||||
| MIPA (mins) | 44 | 44 | F (1,38) = 0.008, | 0.78 | 17 | 48 | 0.000 | 0.000 |
| (36) | (38) | p = 0.928, ηp2 = 0.000 | (0.62, 0.88) | |||||
| VIPA (mins) | 1 | 0 | F (1,38) = 2.659, | 0.42 | 2 | 6 | 0.250 | 0.436 |
| (4) | (1) | p = 0.111, ηp2 = 0.069 | (0.11, 0.65) | |||||
| bouted MVPA | 25 | 30 | F (1,38) = 1.432, | 0.76 | 16 | 45 | 0.167 | 0.311 |
| (mins) | (30) | (35) | p = 0.239, ηp2 = 0.036 | (0.59, 0.87) | ||||
| Diary (n = 39) | ||||||||
| sleep (mins) | 462 | 475 | F (1,38) = 3.998, | 0.87 | 29 | 81 | 0.157 | 0.442 |
| (83) | (81) | p = 0.053, ηp2 = 0.095 | (0.77, 0.93) | |||||
Abbreviations: SD, standard deviation; SEM, standard error of measurement; MDC, minimal detectable change; ES, Cohen’s effect size; GR, Guyatt’s responsiveness coefficient; SB, sedentary behavior; LIPA, low-intensity physical activity; MIPA, moderate-intensity physical activity; VIPA, vigorous-intensity physical activity; int min, intensity minutes.