RT Journal Article SR Electronic T1 Prof. J. M. FORBES JF British Journal of Sports Medicine JO Br J Sports Med FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine SP 86 OP 86 DO 10.1136/bjsm.10.2.86-a VO 10 IS 2 A1 H. E. Robson YR 1976 UL http://bjsm.bmj.com/content/10/2/86.2.abstract AB