Dr. Stacy Sims - Hormones, HRV, and Heavy Lifting: The Science of Training Women Over 45

·47 min·4 clips

Dr. Stacy Sims explains why creatine and vitamin D are essential for women over 45 to maintain muscle and bone health.

This episode features Dr. Stacy Sims, a leading researcher in female physiology, returning to discuss the latest science for active women over 45. Host Eric Malzone structures the conversation around questions sourced from a coach, an educated consumer, and a wellness industry executive. They explore recent developments in women's health research, practical training strategies, and critical science literacy. Dr. Sims notes a significant rise in femtech and more robust, female-designed research that examines hormone fluctuations and menstrual cycle variations. She highlights a growing collaboration between academia and industry, utilizing large wearable datasets while striving for more diverse study populations beyond white, upper-socioeconomic women. The discussion covers the pros and cons of restrictive diets like carnivore for women over 45, emphasizing potential long-term gut microbiome disruption. Dr. Sims identifies creatine and vitamin D as near-essential supplements, stressing the importance of a baseline blood test for personalized vitamin D dosing. A key insight is that hormone levels, particularly progesterone, pulse throughout the day, making single blood tests unreliable for guiding training. Dr. Sims advises perimenopausal women to prioritize intuitive training based on daily readiness over rigid hormone-based periodization. She explains that heavy lifting must be periodized and can be integrated with plyometrics and functional movements, introducing French contrast training for advanced athletes. New research indicates heavier loads with lower reps benefit muscle quality and bone density in older populations, though modifications are needed in group settings. Dr. Sims attributes the democratization of women's health research to increased funding from industry and private donors, a more vocal public conversation, and a desire for objective wellness data outside traditional healthcare. She identifies puberty and resetting health norms for active populations as critical, underfunded research areas. A major red flag in marketing is when claims lack specificity about the study population and its applicability to an individual's life phase. The tone is conversational and educational, blending detailed science with practical coaching advice. This episode is ideal for fitness coaches, perimenopausal athletes, and wellness professionals seeking actionable, science-backed strategies for training women. Listeners looking for broad, introductory fitness content or those uninterested in the specific physiological details of aging women might find it too niche.

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