Table 2.
Interaction effect of mechanical sprint performance variables during repeated sprints between football players with and without a previous hamstring strain injury (HSI) in the preceding 12 months.
| 30-meter sprint trials | Interaction effect, p-value | ||||||
|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | ||
| FH0 (N/kg) | |||||||
| Previous HSI (n = 11) | 8.18(0.43) | 7.90(0.38) | 7.79(0.76) | 7.88(0.77) | 7.86(0.59) | 7.68(0.61) | 0.860 |
| No previous HSI (n = 33) | 8.45(0.84) | 8.42(1.00) | 8.27(0.99) | 8.30(0.90) | 8.20(0.91) | 8.14(0.68) | |
| V0 (m/s) | |||||||
| Previous HSI (n = 11) | 8.26(0.90) | 8.34(1.00) | 8.32(0.97) | 8.31(0.96) | 8.24(0.89) | 8.21(0.91) | 0.682 |
| No previous HSI (n = 33) | 7.83(0.40) | 7.85 (0.41) | 7.84(0.42) | 7.77(0.44) | 7.85(0.56) | 7.82(0.43) | |
| Pmax (W/kg) | |||||||
| Previous HSI (n = 11) | 16.92 (2.35) | 16.46 (1.97) | 16.20 (2.52) | 16.40 (2.74) | 16.22 (2.40) | 15.85 (2.72) | 0.782 |
| No previous HSI (n = 33) | 16.55 (1.88) | 16.50 (1.98) | 16.23 (2.16) | 16.14 (2.06) | 15.97 (1.97) | 15.90 (1.69) | |
| DRF | |||||||
| Previous HSI (n = 11) | −0.093(0.010) | −0.089(0.013) | −0.088(0.014) | −0.089(0.012) | −0.089(0.011) | −0.088(0.008) | 0.562 |
| No previous HSI (n = 33) | −0.101(0.011) | −0.127(0.150) | −0.092(0.039) | −0.100(0.011) | −0.098(0.011) | −0.097(0.009) | |
FH0 (N/kg), maximal horizontal force production; V0 (m/s), maximal theoretical sprinting velocity; Pmax (W/kg), maximal horizontal power output; DRF, mechanical effectiveness measured as the rate of decrease (slope) in ratio of force with increasing speed.