The mean electrical axis of the heart is not affected by body stature. The angle and magnitude of this axis seem to be altered with exercise conditioning. Electrocardiographic P-R intervals and QRS durations do not seem to be affected by either body stature or conditioning.
Proceedings of the Iowa Academy of Science
©1967 Iowa Academy of Science, Inc.
Imig, John R.
"The Effect of Body Stature and Exercise Conditioning of the Mean Electrical Axis, P-R Interval, QRS Duration, and Rate of the Heart,"
Proceedings of the Iowa Academy of Science, 74(1), 204-209.
Available at: https://scholarworks.uni.edu/pias/vol74/iss1/32