Fig 1.
Schematic setting for the specific endurance field test [15].
Table 1.
Physiological and performance variables corresponding to O2max, first ventilatory threshold (VT1) and second ventilatory threshold (VT2).
Fig 2.
Heart rate (A) and oxygen uptake (B) intensity profiles during one set.
Data from a representative subject expressed as percentage of maximum (%HRmax and %O2max, respectively). Three intensity zones are delimited by the first and second ventilatory thresholds, expressed as (A) heart rate (HRVT1, HRVT2), and (B)
O2 (VT1, VT2) are illustrated (light to dark grey background). The dashed vertical lines represent the 6 rest periods corresponding to game end changes.
Table 2.
Physiological values recorded during the simulated sets.
Fig 3.
Comparison of playing time (%) spent in the three differentiated intensity zones.
Intensity zones defined by the VTs zones method (below VT1 (Zone 1), between VT1 and VT2) (Zone 2), and over VT2 (Zone 3)) and defined by the HR zones method (below 70% HRmax (Zone 1), between 70 and 85% HRmax (Zone 2), and over 85% HRmax (Zone 3)). Mean ± SD values and standard deviations. **p < 0.001 for VTs zone 1 vs both VTs zones 2 and 3; *p < 0.05 for VTs zone 2 vs VTs zone 3. $ p < 0.001 for HR zone 3 vs both HR zones 1 and 2. # p < 0.001 for HR vs VTs zones 1 and 2.
Table 3.
Pearson’s correlation coefficient (r) between physiological and technical variables determined in the specific tennis test, competitive level and playing time (%) spent in the three differentiated zones.