It’s not funny: How changes in If limit maximum heart rate with aging

It’s not funny: How changes in If limit maximum heart rate with aging

The Rockefeller University Press $30.00 J. Gen. Physiol. 2017 Vol. 149 No. 2 177–179 https://doi.org/10.1085/jgp.201611746 177 Although many of us optimistically try to be “younger next year” (Crowley and Lodge, 2004), there is one inescapable fact: maximum heart rate declines over the decades regardless of fitness level. A parallel decrease in our so-called intrinsic heart rate, measured in th...

It’s not funny: How changes in If limit maximum heart rate with aging

The Rockefeller University Press $30.00 J. Gen. Physiol. 2017 Vol. 149 No. 2 177–179 https://doi.org/10.1085/jgp.201611746 177 Although many of us optimistically try to be “younger next year” (Crowley and Lodge, 2004), there is one inescapable fact: maximum heart rate declines over the decades regardless of fitness level. A parallel decrease in our so-called intrinsic heart rate, measured in th...

It’s not funny: How changes in If limit maximum heart rate with aging

The Rockefeller University Press $30.00 J. Gen. Physiol. 2017 Vol. 149 No. 2 177–179 https://doi.org/10.1085/jgp.201611746 177 Although many of us optimistically try to be “younger next year” (Crowley and Lodge, 2004), there is one inescapable fact: maximum heart rate declines over the decades regardless of fitness level. A parallel decrease in our so-called intrinsic heart rate, measured in th...

'Funny' current: if heart rate slowing is not the best answer, what might be?

Changes in transmitral velocities with heart rate.

Sir, During a study ofchanges in afterload induced by the cold pressor test, Smith et al (1989;61:344-7) recognised a relation between heart rate and transmitral velocities derived from pulsed Doppler recordings. We specifically studied the relation between transmitral velocities and differing RR intervals during exercise and respiration in healthy men.'2We found a clear cut linear change in pe...