RT Journal Article SR Electronic T1 Astrand-ryhming step test norms for college students. 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 76 OP 79 DO 10.1136/bjsm.10.2.76 VO 10 IS 2 A1 W. P. Marley A1 A. C. Linnerud YR 1976 UL http://bjsm.bmj.com/content/10/2/76.abstract AB