Table 3.
Validity of 2km FIT-App (Android version) in comparison with criterion measures (UKK test).
| Outcomes | 2kmFIT-App measure, mean (SD) | Criterion measure (UKK test), mean (SD) | Difference (app – criterion), mean (SD) | P a | MAPEb (%) | ICCc (95% CI) | r d | |
| Distance (meters) | 1929.6 (51.47) | 2000.0 (0.00) | –70.40 (51.47) | <.001 | –3.52 | N/Ae |
|
|
| Time (min) | 16.16 (1.93) | 16.75 (1.79) | –0.58 (0.44) | <.001 | –3.58 | 0.971 (0.928-0.988) | 0.97 | |
| Heart rate (beats/minute) | ||||||||
|
|
P2f – P0g | N/A | 142.35 (16.54) | –16.75 (9.96) | <.001 | –11.77 | 0.731 (–0.211 to 0.928) | 0.84 |
|
|
P2 – P1h | N/A | 140.65 (16.77) | –15.05 (9.56) | <.001 | –10.70 | 0.770 (–0.197 to .0939) | 0.86 |
|
|
P2 | 125.60 (18.32) | 127.55 (16.84) | –1.95 (7.83) | .28 | –1.53 | 0.947 (0.869-0.979) | 0.90 |
| VO2maxi (ml/min/kg) | ||||||||
|
|
P2 – P0 | N/A | 38.16 (5.27) | 3.59 (2.01) | <.001 | 9.41 | 0.878 (–0.125 to 0.972) | 0.95 |
|
|
P2 – P1 | N/A | 38.35 (5.29) | 3.40 (2.03) | <.001 | 8.88 | 0.887 (–0.102 to 0.974) | 0.94 |
|
|
P2 | 41.75 (6.06) | 39.79 (5.73) | 1.96 (1.89) | <.001 | 4.93 | 0.948 (0.569-0.986) | 0.95 |
aOne-sample t test: the intertrial difference was entered as a dependent variable; the P value indicates whether the mean difference is significantly different from 0 for all measures.
bMAPE: mean absolute percentage error; calculated as ([study outcome – criterion measure]/criterion measure) × 100.
cICC: intraclass correlation coefficient; model two-way mixed and single measures.
dPearson correlation coefficient.
eN/A: not applicable.
fPolar heart rate when the measurement of the app is completed and shown.
gPolar heart rate immediately when the test finished.
hPolar heart rate when starting the measurement with the app.
iVO2max: maximum oxygen consumption; estimated with the hypothetical arrival at the UKK test finish line considering walking speed and heart rate at P0, P1, and P2, respectively.