RT Journal Article SR Electronic T1 Erratum 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 128 OP 128 DO 10.1136/bjsm.26.2.128 VO 26 IS 2 YR 1992 UL http://bjsm.bmj.com/content/26/2/128.abstract AB