Table 2.
Descriptive statistics of performance, physiological and psychological measures according to the running test and the participants’ sex. Values are means (±SD).
| 15-15 | 20-m shuttle run | |||||
|---|---|---|---|---|---|---|
| Total | Boys | Girls | Total | Boys | Girls | |
| Performance measures | ||||||
| Net run duration (s) | 566(156)*** | 651(179) | 500(149) | 346(156)*** | 433(163) | 243(153) |
| Vpeak (km·h-1) | 13.09 (1.86)*** | 14.05 (2.16) | 12.36 (.72) | 9.86 (1.29)*** | 10.58 (1.33) | 9.00 (.50) |
| Physiological measures | ||||||
| HRpeak (bpm) | 190(5) | 193(4) | 187(6) | 189(6) | 190(8) | 187(4) |
| VO2peak (ml·min-1·kg-1) | 34.2 (5.0) | 36.0 (3.8) | 33.5 (5.6) | 38.4 (6.1) | 41.7 (5.4) | 34.4 (4.6) |
| RER | 1.12 (.02) | 1.13 (.02) | 1.11 (.02) | 1.11 (.04) | 1.10 (.05) | 1.13 (.02) |
| [La-]b (mmol·l-1) | 6.8 (1.9) | 6.9 (1.5) | 7.1 (2.2) | 6.3 (1.4) | 6.1 (1.6) | 6.4 (1.3) |
| Physiological measures at 9 km/h | ||||||
| VO2 (ml·min-1·kg-1) | 28.3 (2.7)*** | 28.9 (1.6) | 28.2 (3.7) | 35.4 (2.7)*** | 36.3 (2.4) | 33.4 (3.1) |
| HR (bpm) | 167(15) | 159(16) | 177(7) | 174(12) | 171(13) | 178(11) |
| Psychological measures | ||||||
| RPE | 16.0 (1.2)*** | 16.0 (1.5) | 16.0 (.7) | 12.7 (1.6)*** | 12.5 (1.8) | 13.0 (1.7) |
| Δ GSW | .2 (1.1) | -.1 (1.1) | .6 (1.1) | .0 (1.1) | -.4 (1.1) | .6 (1.0) |
| Δ PSW | .9 (1.8) | .6 (1.3) | 1.1 (2.3) | -.2 (1.4) | -.4 (1.8) | .1 (.9) |
| Δ PC | 1.4 (1.4)* | 1.3 (1.4) | 1.5 (1.5) | .2 (1.0)* | .2 (1.1) | .2 (.9) |
| Δ SC | 1.1 (1.9) | 1.1 (2.1) | 1.2 (2.0) | -.2 (1.4) | -.8 (1.2) | .6 (1.3) |
| Δ PA | .3 (1.0) | -.3 (.9) | 1.1 (.7) | -.1 (.8) | -.2 (1.0) | .1 (.3) |
| Δ PS | .6 (1.9) | .5 (2.4) | .7 (1.4) | .1 (.9) | .5 (.6) | -.3 (1.1) |
Significant inter-test (15-15 vs. 20-m shuttle run) differences: * p < 0.05;
** p < 0.01;
*** p < 0.001. SD = standard deviation. Vpeak = peak running velocity; HRpeak = peak heart rate; VO2peak = peak oxygen uptake; RER = respiratory exchange ratio; [La-]b = blood lactate concentration; RPE = rating of perceived exertion; GSW = global self-worth; PSW = physical self-worth; PC = physical condition; SC = sport competence; PA = physical attractiveness; PS = physical strength; Δ = measures of the delta between post- and pre-test.