Percorrer por autor "Marques, Nuno Miguel Toureiro"
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- Variability of ground reaction forces between lower limbs during running in male and female rugby players after hamstrings injury : a cross-sectional studyPublication . Marques, Nuno Miguel Toureiro; Oliveira, Paulo Ricardo Miranda; Fernandes, Orlando de Jesus Semedo MendesHamstring injuries are among the most common in rugby, frequently affecting athletic performance due to their influence on lower limb biomechanics. This cross-sectional observational study aimed to evaluate the temporal structure of ground reaction force (GRF) variability between injured and uninjured lower limbs in rugby players with a history of unilateral hamstring injury. Using Detrended Fluctuation Analysis (DFA), the study assessed the temporal structure of motor variability during treadmill running in a sample of 20 athletes (95% male). The DFA alpha values for injured limbs (M = 0.735) and uninjured limbs (M = 0.706) indicated persistent correlations within a functional range (0.5 < α < 1.0), with no statistically significant differences between limbs (p = 0.317). However, a slight trend toward increased motor rigidity in the injured limb was noted, potentially reflecting compensatory adaptations. DFA emerged as a sensitive tool capable of detecting subtle changes in motor control that may not be captured by conventional biomechanical analyses. Limitations included the small sample size, gender imbalance, and treadmill-only testing, which constrain generalizability. Nonetheless, the results highlight the potential of DFA as a valuable adjunct in return-to-play assessments and injury prevention protocols. Future research should adopt longitudinal designs and recruit more diverse samples valid settings to fully explore DFA diagnostic and rehabilitative applications in sports performance.