Training and Nutrition Considerations for Women

Can you optimise your training and nutrition throughout your menstrual cycle?
Aidan Roberts. Eddie Fowke @thecircuitclimbing

This article outlines how women can potentially optimise their training and nutrition in line with the various stages of their menstrual cycle. Originally written for coaching clients, but after many requests I have published it. The topic is huge and fascinating, and I will endeavour to update things as more research is published.

Updated:
Published: 01/03/2019
Comments: Facebook

Notes

A Unique Physiology

Due to a unique physiology including hormonal cycle, women require slightly different fuelling strategies during exercise, find it harder to lose body-fat, respond better or worse to training modalities, may need to consider sodium, hydration and heat management more than men, and performance may be impacted at different times of the month.

Women do generally have smaller hearts, heart volume, lungs (25-30% less capacity than men), lower diastolic pressure (artery pressure between beats), which results in 30% less cardiac output (less oxygenated blood per beat, requiring heavier breathing), lower maximum heart rate, and may be more susceptible to dehydration in hot environments.

Men have significantly higher testosterone which increases the production of red blood cells (6% more red blood cells, 10-15% more haemoglobin) which absorb and carry oxygen to working muscles. Women therefore have a 15-25% lower VO2Max (the maximum amount of oxygen the body can utilise for metabolism per minute). This means that women require a higher heart rate and more oxygen for the same workload as men.

Though women and men generally have the same muscle fibre type percentage: type I endurance (aerobic), type II power (anaerobic); women’s largest fibres tend to be type I (endurance), where men are type II (power). Men therefore have a greater glycolytic capacity, the ability to derive energy from glycogen (muscle glucose) during the absence of oxygen (high-intensity workloads). High glycolytic metabolism however leads to muscle acidity and requires longer recovery between all-out efforts. Women have greater endurance capacity, greater muscle efficiency due to lipid metabolism, and more glycogen sparring ability.

Because of this, men can generate force quicker and are more explosive. However women tend to be able to handle a higher training volume (including higher repetitions) than men. This may be related to the protective effects of estrogen (during high-hormonal phase). Women may recover faster than men after high volume training sessions, however may recover slower from explosive high-intensity sessions. Joint laxity may increase the risk of injury during progesterone elevations.

Although women mobilise more fat during exercise, during recovery women tend to use a higher percentage of carbohydrate, men a higher percentage of fat. Men’s post-exercise metabolism remains elevated for longer than women, and fat-loss is unfortunately harder for women.

Essential body-fat for women is 12% (men 4%), and healthy body-fat ranges for women are 12-30% (men 5-25%). Women tend to fair better on higher fat, lower carbohydrate diets, and are less hungry on higher fat diets.

But Not So Different

Men have reported greater muscle strength and size than women, due to higher levels of anabolic hormones and greater body size. The lower blood androgen levels of women have also been hypothesised to induce less relative muscle hypertrophy in response to resistance training compared with men. However, several studies have failed to identify any difference between males and females with similar relative improvements in strength adaptations. … Men and women exhibited wide ranges of 1RM strength gains from 0 to +250% (0 to +10.2 kg). In addition, men experienced 2.5% greater gains in cross-sectional area (p ≤ 0.05) compared with women. Regardless of men having greater absolute gains in strength, relative baseline strength increases in strength measures were greater in women compared with men (+25%).[1]

Men have more muscle than women, and several attempts have been made to determine the physiological mechanisms responsible for this phenomenon by measuring the rates of muscle protein synthesis (MPS) and breakdown (MPB) without much luck so far. … In support of the general consensus so far, they too report no difference in the rates of MPS between young men and women in the fasted state or the fed state at rest or after exercise. It therefore seems safe to say that West et al. firmly put the final nail in the coffin of the notion that rates of MPS throughout the day are different between healthy young men and women. … In summary, the answer to the question whether there are differences in muscle protein metabolism between healthy young men and women seems to be no.[2]

We have shown that despite differences in mean testosterone level between genders, there is complete overlap of the range of concentrations seen. This shows that the recent decision of the IOC and IAAF to limit participation in elite events to women with a ‘normal’ serum testosterone is unsustainable. We have also shown that the approximate 10-kg deficit in LBM seen in elite female athletes most likely accounts for differences in performance seen between the sexes rather than the hypothesis put forward by the IOC/ IAAF that it is due to testosterone.[3]

Women differ from men with regard to muscle and tendon, most likely because of sex differences in estrogen. The present experimental findings suggest the hypothesis that estrogen has an anabolic effect on muscle primarily by lowering the protein turnover and enhancing sensitivity to resistance training. Furthermore, estrogen may reduce the stiffness of tendons, an effect that may be modified by physical training.[4]

Menstrual Phases and Considerations

Estrogen secretion naturally varies in young women, increasing 10- to 100-fold over the menstrual cycle. Beyond estrogen, the menstrual cycle is characterized by significant changes in other important plasma hormones such as follicle stimulating hormone (FSH), luteinizing hormone (LH), and progesterone. 17β-estradiol levels rise from 5 pg/ml at the early follicular phase, to a peak of 200–500 pg/ml just before ovulation. Ovulation is followed by a rapid decrease in estradiol, then estradiol, and progesterone both increase in the luteal phase giving a broad secondary peak.

The average menstrual cycle lasts 28 days (can range between 21-35 days) and is divided into two 14-day phases. The cycle begins the day of menstruation (Day 1).

High / Low Hormone Phases

During the low-hormone Follicular phase, women are physiologically similar to men, but when hormones rise during the Luteal phase things are quite different.

Both hormones affect fluid balance with estrogen increasing the expression of vasopressin who’s role involves water retention and blood vessel constriction. Elevated levels of progesterone potently reduce the sodium-retaining activity of aldosterone, resulting in a reduction in blood volume, cardiac output, and blood pressure. When blood plasma is low, less blood is pumped with every heartbeat impacting performance. Progesterone also elevates core temperature, which along with lower blood volume can impact the ability to regulate cooling via sweating.

Training and performance may be negatively impacted and feel harder due to reduced connective tissue elasticity, central nervous system fatigue, hydration status, core temperature, and reduced sweating.

During the high-hormone phase, Carbohydrate cravings may increase as glycogen metabolism is lowered. This tends to be most noticeable during the peak hormone PMS run-up phase to menstruation. Metabolism also increases by nearly 200kcal/day during this premenstrual phase.

The uterus lining is shed by a process driven by prostaglandins which make the uterus contract often with various degrees of pain. Headaches may also occur due to blood pressure change. Spatial cognition (the ability to identify targets etc) can be also impaired. Gastrointestinal (GI) issues can occur likely related to the higher levels of prostaglandins.

After menstruation (low-hormone phase), a women’s physiology closer resembles that of a man. Research has shown that women can make greater strength gains, and produce greater force when they train during this low-hormone phase compared to the high-hormone phase.

This does not mean that women cannot train and perform during the high-hormone phase, but it highlights that peak performance will probably occur during the low-hormone phase.

Practical Actions for the High-Hormone Phase

Though there are unique differences between women and men, and those differences may impact performance at times, in regards to nutrition I believe there is not a large difference in application.

However I will highlight some useful actions below.

Timing Training Around Cycle

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Weight Gain

Some women may gain significant weight during the Luteal Phase going into menstruation. This is however mostly water weight. It appears this is related to higher sustained levels of aldosterone. Aldosterone results in sodium retention and potassium excretion in the urine.

Whenever you retain sodium you retain water.

Whereas potassium pulls water into your cells, resulting in a more muscular look, sodium pulls water out of your cells resulting in an often swollen, puffy appearance and possibly feelings of bloating.

As a climber, this could have quite an impact on your performance.

The following can potentially mitigate this, and should be implemented as soon as you notice unfavourable weight gain. Over time you could possibly preempt this and start sooner.

This study is the first to systematically investigate the basis of the somatic symptoms that are associated with fluid retention in women with PMS. These women, who were selected using stringent criteria, reveal that their fluid retention-related symptoms, namely, ankle edema, bloatedness, and breast swelling, during the LL [late luteal] phase of their menstrual cycles, are associated with elevated levels of plasma aldosterone and PRA [plasma renin activity]. The present study shows that women with PMS have exaggerated increases in PRA and plasma aldosterone levels during the LL phase of their menstrual cycles compared with those of healthy control subjects. Although the plasma levels of estrogen and progesterone were comparable, a delay in their physiological withdrawal (withdrawal phase) was evident in the women with PMS during the LL menstrual phase. This was associated with low plasma levels of LH and FSH.[6]

Notes


  1. Ralston, G. W., Kilgore, L., Wyatt, F. B., & Baker, J. S. (2017). The Effect of Weekly Set Volume on Strength Gain: A Meta-Analysis. Sports Medicine, 47(12), 2585–2601. doi:10.1007/s40279-017-0762-7 ↩︎

  2. Smith, G. I., & Mittendorfer, B. (2012). Similar muscle protein synthesis rates in young men and women: men aren’t from Mars and women aren’t from Venus. Journal of Applied Physiology, 112(11), 1803–1804. doi:10.1152/japplphysiol.00354.2012 ↩︎

  3. Healy, M. L., Gibney, J., Pentecost, C., Wheeler, M. J., & Sonksen, P. H. (2014). Endocrine profiles in 693 elite athletes in the postcompetition setting. Clinical Endocrinology, 81(2), 294–305. doi:10.1111/cen.12445 ↩︎

  4. Hansen, M., & Kjaer, M. (2014). Influence of Sex and Estrogen on Musculotendinous Protein Turnover at Rest and After Exercise. Exercise and Sport Sciences Reviews, 42(4), 183–192. doi:10.1249/jes.0000000000000026 ↩︎

  5. Chris Masterjohn, PhD. https://www.facebook.com/chrismasterjohn/videos/219391622298767/ ↩︎

  6. Rosenfeld, R., Livne, D., Nevo, O., Dayan, L., Milloul, V., Lavi, S., & Jacob, G. (2008). Hormonal and Volume Dysregulation in Women With Premenstrual Syndrome. Hypertension, 51(4), 1225–1230. doi:10.1161/hypertensionaha.107.107136 ↩︎