About the CycleSync Study

The CycleSync Study aims to improve understanding of how female physiology influences wearable-derived health metrics such as heart rate variability (HRV), body temperature, and menstrual cycle data.

Why Study Female Physiology and HRV?

Female physiology is dynamic and influenced by hormonal influences across the menstrual cycle and lifespan. Heart rate variability (HRV) is widely used as a marker of:

• Recovery
• Stress
• Overall physiological readiness
• Wellbeing

However, most current interpretations of HRV may limit accuracy and relevance for women. By better understanding how HRV interacts with female physiology, we can:

• Improve interpretation of wearable data
• Support better decision-making around training and recovery
• Enhance health monitoring across the lifespan
• Reduce inequalities in health and performance science

How your data helps

By participating, you contribute to a growing dataset that helps researchers identify meaningful patterns across menstrual cycles and physiological responses.

All data is collected anonymously and used solely for research purposes.

Who is running this study?

The study is led by University College Dublin, and is a collaboration between researchers from UCD Institute for Sport and Health, Insight Research Ireland Centre for Data analytics, and UCD School of Public Health, Physiotherapy and Sports Science.

More information about our study