Table 2.
Test and retest results of the 2-km walk UKK test (N=20).
| Variable | Overall (test and retest), mean (SD) | Test, mean (SD) | Retest, mean (SD) | P valuea | |
| Outside temperature (°C) | 15.80 (3.28) | 18.40 (4.32) | 13.20 (4.58) | .001 | |
| App distanceb (meters) | 1942.60 (38.31) | 1929.61 (51.47) | 1955.60 (34.91) | .01 | |
| Pace (min/km) | 8.29 (0.88) | 8.37 (0.90) | 8.20 (0.88) | .03 | |
| Time (minutes) |
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Criterionc | 16.57 (1.75) | 16.75 (1.79) | 16.39 (1.77) | .03 |
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Appd | 16.09 (1.82) | 16.16 (1.93) | 16.02 (1.83) | .50 |
| Time (seconds) |
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P0-P2e | 25.85 (4.99) | 25.40 (6.48) | 26.30 (5.89) | .59 |
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P1-P2f | 19.24 (4.95) | 18.78 (5.87) | 19.70 (6.34) | .57 |
| Heart rate (beats/minute) |
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Criterion P0g | 142.08 (17.37) | 142.35 (16.54) | 141.80 (19.48) | .81 |
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Criterion P1h | 139.90 (17.66) | 140.65 (16.77) | 139.15 (19.92) | .53 |
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Criterion P2i | 125.90 (19.78) | 127.55 (16.84) | 124.25 (23.89) | .23 |
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Appj | 123.35 (21.49) | 125.60 (18.32) | 121.10 (26.05) | .15 |
| VO2maxk (ml/min/kg) |
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Criterion P0l | 38.71 (5.17) | 38.16 (5.27) | 39.27 (5.20) | .007 |
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Criterion P1l | 38.95 (5.25) | 38.35 (5.29) | 39.56 (5.35) | .004 |
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Criterion P2l | 40.49 (5.71) | 39.79 (5.73) | 41.20 (5.87) | .006 |
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Appm | 42.21 (5.93) | 41.75 (6.06) | 42.67 (6.18) | .19 |
aPaired-samples t test between test and retest.
bReal distance at which the test measured by means of the app ends.
cEstimated time of the UKK test if mean walking speed up to 2 km as measured by the criterion method would have been maintained.
dTime taken to perform the test measured by the app.
eP0-P2: time difference between the final beep emitted for the app and showing the heart rate on the app screen.
fP1-P2: time difference between the start of heart rate measurement and the end of heart rate calculation by means of the app.
gPolar heart rate immediately when the test finished.
hPolar heart rate when starting the measurement with the app.
iPolar heart rate at the end of the measurement with the app.
jHeart rate measured by the app at the end of the test.
kVO2max: maximum oxygen consumption.
lCriterion VO2max P0, P1, and P2: VO2max estimated with the hypothetical arrival at the UKK test finish line considering walking speed and heart rate at P0, P1, and P2, respectively.
lVO2max estimated by the app calculation.