Inter-session reliability and sex-related differences in hamstrings total reaction time, pre-motor time and motor time during eccentric isokinetic contractions in recreational athlete

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Ayala, Francisco ; De Ste Croix, Mark B ; Sainz de Baranda, Pilar ; Santonja, Fernando (2014)

The purposes were twofold: (a) to ascertain the inter-session reliability of hamstrings total reaction time,\ud pre-motor time and motor time; and (b) to examine sex-related differences in the hamstrings reaction\ud times profile. Twenty-four men and 24 women completed the study. Biceps femoris and semitendinosus\ud total reaction time, pre-motor time and motor time measured during eccentric isokinetic contractions\ud were recorded on three different occasions. Inter-session reliability was examined through typical\ud percentage error (CVTE), percentage change in the mean (CM) and intraclass correlations (ICC). For both\ud biceps femoris and semitendinosus, total reaction time, pre-motor time and motor time measures demonstrated\ud moderate inter-session reliability (CVTE < 10%; CM < 3%; ICC > 0.7). The results also indicated\ud that, although not statistically significant, women reported consistently longer hamstrings total reaction\ud time (23.5 ms), pre-motor time (12.7 ms) and motor time (7.5 ms) values than men. Therefore, an\ud observed change larger than 5%, 9% and 8% for total reaction time, pre-motor time and motor time respectively\ud from baseline scores after performing a training program would indicate that a real change was\ud likely. Furthermore, while not statistically significant, sex differences were noted in the hamstrings reaction\ud time profile which may play a role in the greater incidence of ACL injuries in women.
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