RT Journal Article
SR Electronic
T1 A review of the stroke volume response to upright exercise in healthy subjects
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 190
OP 195
DO 10.1136/bjsm.2004.013037
VO 39
IS 4
A1 Vella, C A
A1 Robergs, R A
YR 2005
UL http://bjsm.bmj.com/content/39/4/190.abstract
AB Traditionally, it has been accepted that, during incremental exercise, stroke volume plateaus at 40% of Vo2max. However, recent research has documented that stroke volume progressively increases to Vo2max in both trained and untrained subjects. The stroke volume response to incremental exercise to Vo2max may be influenced by training status, age, and sex. For endurance trained subjects, the proposed mechanisms for the progressive increase in stroke volume to Vo2max are enhanced diastolic filling, enhanced contractility, larger blood volume, and decreased cardiac afterload. For untrained subjects, it has been proposed that continued increases in stroke volume may result from a naturally occurring high blood volume. However, additional research is needed to evaluate the importance of blood volume, or other mechanisms, that influence the stroke volume response to exercise in untrained subjects.