Experimental studies of physical fitness in relation to age
S. Robinson

The effect of age on contractile protein ATPase activity and the velocity of shortening
N. R. Alpert and others

Reduction in maximal oxygen uptake with age
I. Astrand and others

Diminished inotropic response of aged myocardium to catecholamines
E. G. Lakatta and others

Decrease in the rate of RNA and protein synthesis and degradation in the myocardium under long-term compensatory hyperfunction and on aging
F. Z. Meerson and others

Effect of age on the response of the left ventricular ejection fraction to exercise
S. Port and others

Role of aortic input impedance in the decreased cardiovascular response to exercise with aging in dogs
F. C. Yin and others

Intracellular calcium transients and developed tension in rat heart muscle. A mechanism for the negative interval–strength relationship
C. H. Orchard and E. G. Lakatta

Age-associated changes in beta-adrenergic modulation on rat cardiac excitation–contraction coupling
R. P. Xiao and others

Impact of age on the cardiovascular response to dynamic upright exercise in healthy men and women
J. L. Fleg and others