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COWAN, SM, AG SCHACHE, P. BRUKNER, KL BENNELL, PW HODGES, P. COBURN, and KM CROSSLEY. Delayed Onset of Transversus Abdominus in Long-Standing Groin Pain. Med. Sci. Sports Exerc., Vol. 36, No. 12, pp. 2040–2045, 2004. Long-standing groin pain is a persistent problem that is commonly difficult to rehabilitate. Theoretical rationale indicates a relationship between the motor control of the pelvis and long-standing groin pain; however, this link has not been investigated. The current experiment aimed to evaluate motor control of the abdominal muscles in a group of Australian football players with and without long-standing groin pain. Ten participants with long-standing groin pain and 12 asymptomatic controls were recruited for the study. Participants were elite or subelite Australian football players. Fine-wire and surface electromyography electrodes were used to record the activity of the selected abdominal and leg muscles during a visual choice reaction-time task (active straight leg raising). When the asymptomatic controls completed the active straight leg raise (ASLR) task, the transversus abdominus contracted in a feed-forward manner. However, when individuals with long-standing groin pain completed the ASLR task, the onset of transversus abdominus was delayed (P 0.05) compared with the control group. There were no differences between groups for the onset of activity of internal oblique, external oblique, and rectus abdominus (all P 0.05). The finding that the onset of transversus abdominus is delayed in individuals with long-standing groin pain is important, as it demonstrates …