The mean electrical axis of the heart, while undergoing certain minor transformations, was not significantly altered by exercise.
Proceedings of the Iowa Academy of Science
© Copyright 1968 by the Iowa Academy of Science, Inc.
Collier, Wade L.
"Studies of the Mean Electrical Axis During and After Exercise,"
Proceedings of the Iowa Academy of Science, 75(1), 285-290.
Available at: https://scholarworks.uni.edu/pias/vol75/iss1/38