#501: Sex-based Training Recommendations: Evidence-based or Hype? – David Nolan, PhD
Nov 7, 2023
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Dr. David Nolan, researching sex differences in exercise response, discusses the belief that women need different training guidelines than men due to their physiological differences. However, research indicates that when both sexes follow matched resistance training, the improvements in strength and hypertrophy are similar. The podcast explores the differences between male and female physiology and anatomy and emphasizes the importance of training the individual rather than their sex. It also delves into the impact of the menstrual cycle on performance and the need for personalized strategies. Dr. Nolan also explores the concept of nihilism and its influence on their work as an exercise scientist, highlighting the importance of finding satisfaction and attributing actions to incompetence rather than malice.
Both males and females respond similarly in terms of strength and hypertrophy adaptations to matched resistance training protocols.
Menstrual cycle phase does not consistently affect performance or training outcomes, but tracking symptoms and performance can aid individualized coping strategies.
There is no evidence to support the need for sex-specific training programs, as adaptations to strength training protocols are similar between males and females.
Deep dives
Sex differences in strength training adaptations
Following matched resistance training protocols, males and females respond similarly in terms of strength and hypertrophy adaptations. While males may gain more in absolute terms due to baseline differences, both genders increase at a similar rate when considering relative gains. Females may even display superior upper body strength gains.
Understanding individual responses to menstrual cycle
While menstrual cycle phase has not consistently been shown to affect performance or training outcomes, there is a high degree of inter-individual variability. Some individuals may experience reduced performance during certain phases, while others may not perceive any difference. Tracking symptoms and performance over time can help identify individual patterns and tailor coping strategies accordingly.
Impact of hormonal contraceptive use
Current evidence suggests that there is no significant difference in strength, power, or hypertrophy adaptations between users of oral contraceptive pills and non-users. More research is needed to fully understand the effects of other forms of hormonal contraceptives and to explore the potential impact on different training outcomes. For now, there is no evidence-based rationale to advocate for or against the use of oral contraceptive pills in relation to resistance exercise training goals.
No Need for Sex-Specific Training
There is no strong evidence to suggest that males and females need to be trained differently when it comes to strength and conditioning. The adaptations to strength training protocols seem to be very similar between the sexes, and there is no evidence supporting the need for sex-specific training programs. While some argue for female-specific research, the current body of evidence does not support the idea that females require different training approaches. From a technical perspective, the principles and methods of training, such as progressive overload and specificity, apply to both sexes. While coaching approaches may differ interpersonally, the technical aspects of training do not require sex-specific considerations.
The Menstrual Cycle and Training
There have been claims that training should be adapted based on the menstrual cycle, but the current evidence does not support this. Menstrual cycle phases do not seem to have consistent effects on acute performance or training adaptations. While some argue that higher estrogen levels during the follicular phase may enhance strength and recovery, and higher progesterone levels during the luteal phase may hinder performance, studies have not consistently shown superior gains with phase-based training. There is significant variability in how individuals respond to hormones, and the menstrual cycle is just one of the many factors to consider in training. Further research is needed to better understand the effects of the menstrual cycle on training outcomes.
The field of research exploring sex differences in exercise response has yielded intriguing findings, shedding light on the complex interplay between biology, physiology, and training adaptations.
One of the fundamental areas of investigation pertains to sex disparities in strength, power, and hypertrophy. Historically, it’s been well-established that males, on average, exhibit greater absolute strength and muscle mass compared to females. This discrepancy often traces its roots back to inherent physiological distinctions.
However, when it comes to responses to strength and hypertrophy training, the narrative becomes more nuanced. Research indicates that, when individuals of both sexes follow matched resistance training protocols, the relative improvements in strength and hypertrophy are quite similar.
So, do women need to be trained differently than men? The answer, it appears, is not as much as one might assume. The principles of progressive overload, specificity, and other training fundamentals remain constant. While individualization is key, the idea of drastically distinct training guidelines based on sex lacks compelling empirical support.
The guest in this episode, Dr. David Nolan, is a researcher in the area of sex differences in exercise response, and has looked at the influences of menstrual cycle and hormonal contraceptive use in female athletes on their performance.
In this episode, we discuss the research to date, and what this means practically for athletes and coaches.
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