Overview

• A McMaster University study of 12 women published in the Journal of Physiology detected no significant differences in muscle development between the cycle’s four phases
• A Nutrition Reviews overview from New Zealand indicates that women may need 100–300 extra calories daily during the luteal phase compared with the follicular phase
• A spring survey by KKH Kaufmännische Krankenkasse found that 76 percent of women reported positive physical and emotional effects from aligning training or diet with their cycle
• Researchers caution that fixed cycle-syncing programs often neglect individual variability in cycle length, ovulation timing and hormone fluctuations
• Chelsea FC Women have used a cycle-tracking app for five years to personalize player training and reduce injury risk