SD1n

Physical fitness has no effect on SD1n in humans (32 +/- 17, 28 +/- 13, and 26 +/- 11 in good, average, and poor fitness groups, respectively).

“The age-matched subjects with good, average, and poor VO2 peak showed no difference in SD1n at rest”

HumansAt rest; fitness groups matched for agemales

Vagal modulation of heart rate during exercise: effects of age and physical fitness

The American journal of physiology·1 Feb 1998

Older age has no effect on SD1n in humans (11 +/- 5, 9 +/- 5, and 8 +/- 4 in young, middle-aged, and old groups, respectively).

“11 +/- 5, 9 +/- 5, and 8 +/- 4 at the level of 100 W; P = not significant (NS)”

HumansDuring bicycle exercise; age groups matched for peak oxygen consumption100 Wmales

Vagal modulation of heart rate during exercise: effects of age and physical fitness

The American journal of physiology·1 Feb 1998

Physical fitness is associated with SD1n in humans (13 +/- 6, 10 +/- 5, and 6 +/- 3 in good, average, and poor fitness groups, respectively, at 100 W).

“13 +/- 6, 10 +/- 5, and 6 +/- 3 for good, average, and poor fitness groups, respectively; P < 0.001, 100 W”

HumansDuring bicycle exercise; fitness groups matched for ageLow to moderate exercise intensity; 100 W examplemales

Vagal modulation of heart rate during exercise: effects of age and physical fitness

The American journal of physiology·1 Feb 1998

Older age is associated with SD1n in humans (39 +/- 14, 27 +/- 16, and 21 +/- 8 in young, middle-aged, and old groups, respectively).

“SD1n was higher at rest in the young subjects than in the middle-aged or old subjects”

HumansAt rest; age groups matched for peak oxygen consumptionmales

Vagal modulation of heart rate during exercise: effects of age and physical fitness

The American journal of physiology·1 Feb 1998