1. Physical fitness and all-cause mortality. A prospective study of healthy men and women;Blair;JAMA,1989
2. ACSM's guidelines for exercise testing and prescription;American College of Sports Medicine,2009
3. Astrand–Ryhming step test norms for college students;Marley;Br J Sports Med,1976
4. The use of step tests for physical work capacity evaluation;Druskins,1994
5. Aerobic work capacity in men and women with special reference to age;Astrand;Acta Physiol Scand Suppl,1960