Mss21511 233..243

CHAPMAN, A. R., P. W. HODGES, A. M. BRIGGS, P. J. STAPLEY, and B. VICENZINO. Neuromuscular Control and ExerciseRelated Leg Pain in Triathletes. Med. Sci. Sports Exerc., Vol. 42, No. 2, pp. 233–243, 2010. Previous studies have shown that cycling can directly influence neuromuscular control during subsequent running in some highly trained triathletes. A relationship between this altered neuromuscular control of running and musculoskeletal pain and injury has been proposed; however, this link has not been investigated. Purpose: This study aimed to evaluate the influence of cycling on neuromuscular control during subsequent running in highly trained triathletes with and without exercise-related leg pain (ERLP). Methods: Participants were 34 highly trained triathletes: 10 triathletes with a history of ERLP and 24 training-matched control triathletes with no history of ERLP. Knee and ankle kinematics and leg muscle recruitment were compared between a baseline run (no prior exercise) and a transition run (preceded by cycling; i.e., run vs cycle run). Results: Knee and ankle joint kinematics were not different between baseline and transition runs for any triathletes: absolute mean difference (T95% confidence interval) was 1.49T 0.17-. However, muscle recruitment was different between baseline and transition runs, defined by absolute mean difference in EMG amplitude Q10%, in 5 of 24 control triathletes (11/130 muscles exhibited altered recruitment) and in 5 of 10 triathletes with a history of ERLP (12/50 muscles exhibited altered recruitment). This represents a relative risk of 2.40 (0.89–6.50; P = 0.089) when defined by athletes and 2.62 (1.34–6.01; P G 0.01) when defined by muscles. The magnitude of change in muscle recruitment between baseline and transition runs was not different between control (14.10% T 2.34%) and ERLP triathletes (16.31% T 3.64%; P = 0.41). Conclusions: This study demonstrates an association between ERLP in triathletes and their neuromuscular control when running off the bike.