In the original article, there was a mistake in Table 1 as published. The mistake concerns the peak power output values provided for the 1-min and the 3-min test. We initially based the calculations on the mean peak power output of the 1-min and the 3-min test on the values provided by the internal software of the Concept2 ski ergometer, which are cumulative averages (i.e., the first average is an average over the first 30 s, the second average is an average over the first minute, the third over one and a half minutes and so forth). However, when submitting this manuscript we recalculated the mean peak power output to reflect 30-s averages that are not cumulative and hence independent of the power output produced in the previous 30-s period.
Table 1.
Power output, physiological and perceptual parameters of test day 1 and 2 for a 1-min, a 3-min and an incremental upper-body poling test in able-bodied, upper-body trained participants (means ± SD).
| 1-min | 3-min | Incremental | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Day 1 | Day 2 | p-value | Day 1 | Day 2 | p-value | Day 1 | Day 2 | p-value | |
| Power output (Watt) | 254 ± 46 | 259 ± 47* | < 0.001 | 198 ± 40 | 203 ± 33*, † | < 0.001 | 192 ± 29 | 200 ± 28*, † | < 0.001 |
| VO2peak (mL·kg−1·min−1) | 40.0 ± 5.2 | 40.9 ± 5.0* | 0.014 | 44.2 ± 5.7 | 44.7 ± 5.5† | 0.262 | 45.0 ± 5.8 | 45.9 ± 5.5†,‡ | 0.085 |
| VO2peak (L·min−1) | 3.09 ± 0.42 | 3.17 ± 0.39* | 0.007 | 3.40 ± 0.48 | 3.44 ± 0.46† | 0.270 | 3.46 ± 0.45 | 3.54 ± 0.49†,‡ | 0.068 |
| VCO2peak (L·min−1) | 3.46 ± 0.60 | 3.56 ± 0.49 | 0.152 | 4.03 ± 0.63 | 4.12 ± 0.62† | 0.147 | 3.97 ± 0.52 | 4.19 ± 0.55*, † | 0.001 |
| VE (L·min−1) | 145 ± 32 | 144 ± 27 | 0.677 | 161 ± 29 | 162 ± 30† | 0.806 | 161 ± 23 | 165 ± 22*, † | 0.044 |
| HRpeak (beats·min−1) | 168 ± 11 | 165 ± 12* | 0.016 | 172 ± 13 | 171 ± 14† | 0.611 | 171 ± 14 | 171 ± 14† | 0.578 |
| BLapeak (mmol·L−1) | 11.0 ± 2.1 | 10.9 ± 2.5 | 0.868 | 11.6 ± 2.4 | 11.8 ± 2.2† | 0.489 | 11.4 ± 2.3 | 12.0 ± 2.2† | 0.166 |
| RPEO (6–20) | 18.1 ± 1.3 | 17.8 ± 1.4 | 0.318 | 18.1 ± 1.0 | 18.3 ± 1.2† | 0.465 | 18.3 ± 0.9 | 18.3 ± 1.2 | 0.935 |
| RPER (6–20) | 17.6 ± 1.5 | 17.4 ± 1.6 | 0.554 | 17.7 ± 1.7 | 17.9 ± 1.8 | 0.484 | 17.7 ± 1.8 | 17.8 ± 1.7 | 0.544 |
| RPEM (6–20) | 18.3 ± 1.1 | 18.2 ± 1.3 | 0.618 | 18.3 ± 1.1 | 18.4 ± 1.2 | 0.656 | 18.6 ± 0.9 | 18.4 ± 1.2 | 0.432 |
Calculations are based on data from 22 participants for the 1-min and the incremental test and 24 participants for the 3-min test.
Peak oxygen uptake (VO2peak), peak carbon dioxide production (VCO2peak), minute ventilation (VE), peak heart rate (HRpeak), peak blood lactate (BLapeak), overall rate of perceived exertion (RPEO), respiratory rate of perceived exertion (RPER), muscular rate of perceived exertion (RPEM).
Significant differences from day 1 to day 2 at an alpha level of 0.05.
Mean value of day 1 and day 2 significantly different from 1-min test mean value at an alpha level of 0.05.
Mean value of day 1 and day 2 significantly different from 3-min test mean value at an alpha level of 0.05.
The corrected Table 1 appears below.
In the original article, there was an error. The mistake is in line with what is described in the above.
A correction has been made to the section Results, subsection Comparison of Tests, paragraph 1:
Based on the average values of test day 1 and 2, the incremental (45.4 ± 5.5 mL·kg−1·min−1, 196 ± 28 W) and the 3-min test (44.5 ± 5.5 mL·kg−1·min−1, 201 ± 36 W) resulted in significantly higher VO2peak and lower POpeak as compared to the 1-min test (40.4 ± 5.0 mL·kg−1·min−1, 256 ± 47 W) (all p < 0.001). Additionally, the incremental test resulted in significantly higher VO2peak (p = 0.03).
The authors apologize for these errors and state that this does not change the scientific conclusions of the article in any way.
The original article has been updated.
Conflict of interest statement
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.