RT Journal Article SR Electronic T1 Year Book of Sports Medicine 1984 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 220 OP 220 DO 10.1136/bjsm.19.4.220 VO 19 IS 4 A1 H. E. Robson YR 1985 UL http://bjsm.bmj.com/content/19/4/220.abstract AB