1. School of Physical and Health Education, Queen’s University, Kingston, ON K7L 3N6, Canada.
2. Department of Physiology, Queen’s University, Kingston, ON K7L 3N6, Canada.
3. Department of Obstetrics and Gynaecology, Queen’s University, Kingston, ON K7L 3N6, Canada.
4. School of Kinesiology, Faculty of Health Sciences, University of Western ON, London, ON N6A 3K7, Canada.