Table 4.
Summary of the Results of the Studies which Investigated the Acute Effects of Stretching of the Hip Flexor Muscles.
| Study | Stretching Duration (s) |
Stretching Type | Related Group of the Parameter | Change in % | Effect Size |
|---|---|---|---|---|---|
| Wallmann et al. [23] | 30 | Dynamic | sport-specific parameters | −0.87% | 0.1 |
| 30 | Static | sport-specific parameters | −0.17% | 0.02 | |
| 30 | Ballistic | sport-specific parameters | 0.34% | 0.04 | |
| Zakas et al. [27] * | 60 | Static | isokinetic parameters | −0.28% | 0.02 |
| 60 | Static | isokinetic parameters | 0.05% | 0.003 | |
| 60 | Static | isokinetic parameters | −0.46% | 0.03 | |
| 60 | Static | isokinetic parameters | −0.61% | 0.04 | |
| 60 | Static | isokinetic parameters | −0.56% | 0.04 | |
| Wakefield et al. [25] | 90 | Static | sport-specific parameters | 1.74% | na |
| Aslan et al. [12] | 120 | Dynamic | balance and proprioception parameters | 7.01% | 0.14 |
| 120 | Dynamic | balance and proprioception parameters | −72.82% | 0.28 | |
| 120 | Dynamic | balance and proprioception parameters | 1.66% | 0.17 | |
| 120 | Dynamic | balance and proprioception parameters | 5.23% | 0.61 | |
| 120 | Dynamic | balance and proprioception parameters | 3.65% | 0.44 | |
| 120 | PNF (hold-relax) | balance and proprioception parameters | 15.57% | 0.23 | |
| 120 | PNF (hold-relax) | balance and proprioception parameters | −25.94% | 0.15 | |
| 120 | PNF (hold-relax) | balance and proprioception parameters | 1.38% | 0.17 | |
| 120 | PNF (hold-relax) | balance and proprioception parameters | 2.78% | 0.25 | |
| 120 | PNF (hold-relax) | balance and proprioception parameters | 1.02% | 0.11 | |
| Young et al. [26] | 270 | Static | sport-specific parameters | 0.49% | 0.12 |
| Marek et al. [24] | 480 | PNF (contract-relax) | isokinetic parameters | −5.96% | 0.18 |
| 480 | PNF (contract-relax) | isokinetic parameters | −3.17% | 0.07 | |
| 480 | PNF (contract-relax) | isokinetic parameters | −4.06% | 0.12 | |
| 480 | PNF (contract-relax) | isokinetic parameters | −4.48% | 0.11 | |
| 480 | Static | isokinetic parameters | −0.16% | 0.005 | |
| 480 | Static | isokinetic parameters | −1.68% | 0.04 | |
| 480 | Static | isokinetic parameters | −0.37% | 0.01 | |
| 480 | Static | isokinetic parameters | −2.62% | 0.06 | |
| Zakas et al. [27] * | 480 | Static | isokinetic parameters | −5.54% | 0.4 |
| 480 | Static | isokinetic parameters | −5.92% | 0.41 | |
| 480 | Static | isokinetic parameters | −7.22% | 0.52 | |
| 480 | Static | isokinetic parameters | −6.57% | 0.46 | |
| 480 | Static | isokinetic parameters | −8.19% | 0.65 | |
| Cramer et al. [21] | 480 | Static | isokinetic parameters | −2.72% | 0.11 |
| 480 | Static | isokinetic parameters | −4.18% | 0.14 | |
| 480 | Static | isokinetic parameters | −1.56% | 0.2 | |
| 480 | Static | isokinetic parameters | 5.97% | 0.29 | |
| 480 | Static | isokinetic parameters | −7.93% | 0.32 | |
| 480 | Static | isokinetic parameters | 2.51% | 0.08 | |
| Cramer et al. [22] | 480 | Static | isokinetic parameters | Not reported | na |
| 480 | Static | isokinetic parameters | Not reported | na | |
| 480 | Static | isokinetic parameters | −3.00% | na | |
| 480 | Static | isokinetic parameters | −17.50% | na |
The results are sorted according to the stretch duration. Green color = significant improvement; Red color = significant impairment; Grey color = no significant Change; na = not available. * = Zakas et al. [27] had two stretch durations (60 s and 480 s).