Table 3.
Descriptive statistics (mean ± SD) and differences between elite and sub-elite youth tennis players in different games and tactical situations (n = 32)
| Interaction | |||||
|---|---|---|---|---|---|
| Elite (n = 15) | Sub-elite (n = 17) | Total (n = 32) | F(df)a | pb | |
| Game situation | 1.045 (3) | .375 | |||
| Game 1 | |||||
| VA-index | 3073 ± 7.83 | 22.69 ± 12.40 | 26.46 ±11.12 | ||
| Mean velocity (kph) | 104.66 ± 5.21 | 96.40 ± 8.97 | 100.27 ± 8.45 | ||
| Mean accuracy (points) | 2.53 ± .65 | 2.09 ± .97 | 2.30 ± .85 | ||
| Percentage errors (%) | 34.07 ± 9.82 | 36.59 ± 15.97 | 35.41 ± 13.30 | ||
| Game 2 | |||||
| VA-index | 29.38 ±11.99 | 23.47 ±10.07 | 26.24 ±11.23 | ||
| Mean velocity (kph) | 106.23 ± 5.30 | 97.65 ± 8.02 | 101.67 ±8.05 | ||
| Mean accuracy (points) | 2.33 ± .89 | 2.13 ±.67 | 2.22 ± .78 | ||
| Percentage errors (%) | 37.78 ± 13.16 | 40.19 ± 13.83 | 39.06 ± 13.35 | ||
| Game 3 | |||||
| VA-index | 31.52 ±6.31 | 18.17 ±6.53 | 24.42 ± 9.26 | ||
| Mean velocity (kph) | 107.43 ± 4.86 | 97.87 ± 7.39 | 102.35 ± 7.90 | ||
| Mean accuracy (points) | 2.46 ± .47 | 1.71 ± .58 | 2.06 ± .65 | ||
| Percentage errors (%) | 36.65 ± 10.45 | 45.09 ± 16.08 | 41.14 ±14.18 | ||
| Game 4 | |||||
| VA-index | 30.57 ± 8.32 | 19.13 ±8.04 | 24.49 ± 9.92 | ||
| Mean velocity (kph) | 106.18 ± 6.95 | 98.92 ± 7.28 | 102.32 ± 7.92 | ||
| Mean accuracy (points) | 2.44 ± .64 | 1.74 ±.65 | 2.07 ± .72 | ||
| Percentage errors (%) | 32.22 ± 9.21 | 41.17 ±12.60 | 36.98 ±11.86 | ||
| Tactical situation | .80 (2) | .452 | |||
| Offensive | |||||
| VA-index | 37.88 ± 8.91 | 24.12 ± 10.35 | 29.71 ± 11.84 | ||
| Mean velocity (kph) | 108.22 ± 4.40 | 100.88 ± 7.55 | 103.86 ± 7.35 | ||
| Mean accuracy (points) | 2.91 ± .64 | 2.09 ± .71 | 2.42 ± .78 | ||
| Percentage errors (%) | 31.42 ±6.28 | 39.91 ± 10.78 | 36.46 ± 10.03 | ||
| Neutral | |||||
| VA-index | 31.37 ±8.36 | 21.99 ±7.93 | 25.80 ± 9.24 | ||
| Mean velocity (kph) | 106.80 ± 5.49 | 99.48 ± 8.37 | 102.45 ±8.11 | ||
| Mean accuracy (points) | 2.47 ±.61 | 1.95 ±.61 | 2.16 ± .65 | ||
| Percentage errors (%) | 35.26 ± 9.43 | 40.35 ± 8.90 | 38.28 ± 9.32 | ||
| Defensive | |||||
| VA-index | 26.31 ± 6.21 | 17.42 ± 7.21 | 21.03 ±8.05 | ||
| Mean velocity (kph) | 103.44 ± 6.37 | 95.36 ± 8.27 | 98.64 ± 8.46 | ||
| Mean accuracy (points) | 2.21 ± .44 | 1.69 ±.58 | 1.90 ± .58 | ||
| Percentage errors (%) | 38.12 ±9.75 | 40.79 ± 15.25 | 39.71 ± 13.17 | ||
Note: aANOVA for the interaction of Level × Game number, and Level × Tactical; bp-value (two-tailed