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RISK FACTORS FOR EXERCISE ASSOCIATED MUSCLE CRAMPING (EAMC) IN MARATHON RUNNERS 993

Manjra, S; Schwellnus, M P FACSM; Noakes, T D FACSM

Medicine & Science in Sports & Exercise: May 1996 - Volume 28 - Issue 5 - p 167
Annual Meeting Abstracts
Free

Sports Medicine, MRC/UCT Bioenergetics of Exercise Research Unit, University of Cape Town, South Africa.

Supported by the Sports Medicine Research Fund of the University of Cape Town

    The actiology of and risk factors for EAMC are not known. The aim of this study was to identify risk factors associated with (EAMC) in marathon runners. 1383 marathon (42km) runners responded to a questionnaire designed to identify risk factors for EAMC. Responders were divided into a cramping (C, n=536) and a non-cramping (NC, n=847) group according to their past history of EAMC. In the C group, EAMC during running (as a% of crampers) was associated with; racing (85%), onset of cramping after 30 km (80%), muscle fatigue (60%), fast running pace (57%), hill running (53%) and poor race preparation (42%). The most common muscle groups affected were calf (80%), hamstring (66%) and quadriceps (48%). In comparing the C and NC groups, the C group had a significantly, greater male to female ratio (32:1 vs 6:1) (p<0.05), longer history of running (6.1±5.3 vs 4.9±4.4 years) (mean±SD), shorter duration of daily stretching time (6.2±6.9 vs 7.9±5.9 min), and a greater prevalence of a positive family history of cramping (19 vs 10%) than the NC group. Weekly training load, training speed, drinking patterns during races, and Na+ intake were not different between the C and NC groups. In conclusion, EAMC is related to intense, fatigue inducing running such as racing or prolonged running (>30km), and is common in skeletal muscle groups that span across two joints. Furthermore, specific risk factors for EAMC are male gender, longer running history, shorter duration of daily stretching and a positive family history for cramping.

    Section Description

    G-19 POSTER SKELETAL MUSCLE I

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