Health, Hormones and Human Performance Part 2

Endocrine and Metabolic aspects of Sports and Exercise Medicine are crucial determinants of health and human performance, from reluctant exerciser through to elite athlete and professional dancer. This is what the recent BASEM spring conference set out to demonstrate. The previous blog described functional disruption of Endocrine networks caused by non-integrated periodisation of the three key lifestyle factors of exercise/training, nutrition and recovery/sleep, can lead to adverse effects on health and athletic performance.

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Integrated periodisation of exercise, nutrition, recovery for optimisation of health and performance (Keay BJSM 2017)

Grace, aesthetic line and ethereal quality belie the athletic prowess required in ballet. What are the Endocrine, metabolic and bone health consequences for this unique group of athletes? Dr Roger Wolman (Medical Advisor to National Institute for Dance Medicine and Science) returned to the important topic of insufficient energy availability in sport/dance where being lightweight confers a performance advantage, resulting in dysfunction in multiple endocrine axes. Dr Wolman discussed his recent research studies in dancers revealing an intriguing synergistic action between oestrogen and vitamin D, which is itself a steroid hormone. Evidence was presented to demonstrate how being replete in vitamin D has beneficial effects on bone, immunity and muscle function. Thus it is key in preventing injury and supporting health in athletes, with particular relevance in premenarchal and postmenopausal women, who are in relative oestrogen deficient states. This presentation will certainly change my clinical practice and, I am sure, that of many in the audience, in ensuring that athletes/patients are vitamin D replete. This may have to be achieved in the form of strategic use of sports informed vitamin D supplementation, given that even walking naked for 5 hours a day outside during UK winter, would not stimulate enough vitamin D production. Therefore, to the relief of many in the audience, Dr Wolman did not recommend this strategy.

Dr Kate Ackerman (member of RED-S IOC working group) explained why we should all tap into our inner endocrinologist. Sport and Exercise Medicine (SEM) goes far beyond diagnosing and treating injury. Is there any underlying endocrine cause for suboptimal health, performance or injury? Be this an endocrine diagnosis that should not be missed, or a functional endocrine dysfunction due to relative energy deficiency in sports (RED-S). Dr Ackerman explained the importance of the multidisciplinary team in both identifying and supporting an athlete experiencing the consequences of RED-S. New research from Dr Ackerman’s group was presented indicating the effects of RED-S on both health and athletic performance.

Females now have combative roles alongside their male counterparts. What are the implications of this type of intensive exercise training? Dr Julie Greaves (Research Director of the ministerial women in ground close combat research programme) presented insightful research revealing that differences in the geometry of bone in men and women can predispose towards bone stress injury and account for increased incidence in this type of injury in female recruits.

Lunchtime discussion and debate was focused on the determinants of athletic gender, lead by Dr Joanna Harper and Professor Yannis Pitsiladis (International Federation of Sports Medicine). Rather than relying on genetic sex, testosterone concentration was proposed as the criteria for determining whether an athlete competes in male or female events. That testosterone concentration is linked to performance was demonstrated in a study published last year in the BMJ where female athletes in the upper tertile of testosterone were shown to have a performance advantage in certain strength based track and field disciplines. This could potentially be an objective, functional metric used to determine sporting categories for transgender and intersex athletes. The only current uncertainty is how previously high levels of testosterone seen in male, or intersex athletes would have already had an impact on physiology, if this athlete then wished to compete as female and therefore lower testosterone levels with medication.

Nutrition is a key component in optimising health and performance through the Endocrine system. Dr Sophie Killer (English Institute of Sport) explained practical implications for athletes. In a study stimulating a training camp, there were distinct differences between athletes on different regimes of carbohydrate intake in terms of endocrine markers and psychological effects. Those athletes on restricted carbohydrate intake fared worse.

Insulin insensitivity is the underlying pathological process in developing type 2 diabetes mellitus (T2DM) and metabolic syndrome. What is the crucial lifestyle intervention to combat this? Dr Richard Bracken (Swansea University) presented the science behind why and how exercise improves blood glucose control and therefore ultimately risk of developing the macro and microvascular complications of diabetes. T2DM is an increasing health issue in the population, which has to be addressed beyond reaching for the prescription pad for medication. Dr Bracken outlined some effective strategies to encourage the reluctant exerciser to become more active. Having worked myself in NHS diabetic clinics over many years, this was a key presentation at the conference to demonstrate that SEM goes far beyond a relatively small group of elite athletes. Highlighting the crucial role of physical activity in supporting health and performance through optimisation of endocrine networks: uniting the elite athlete and the reluctant exerciser.

One road to Rome
One Road to Rome (BJSM Keay 2017)

Motivate2Move initiative aims to shift the emphasis from treating disease, to preventing disease. Dr Brian Johnson presented the excellent resource for healthcare professionals to encourage, motivate and educate patients in order to consider exercise as an effective and enjoyable way to improve health.

Hormones play a key role in health and human performance, applicable to all levels of exerciser from reluctant exerciser to elite athlete.

FactorsWordCloud4

References

Health, Hormones and Human Performance BASEM Spring Conference

Video of presentation on Endocrine and Metabolic aspects of Sport and Exercise Medicine from BASEM Spring Conference

Sports Endocrinology – what does it have to do with performance? Keay BJSM 2017

Lifestyle Choices for optimising health: exercise, nutrition, sleep Keay BJSM 2017

One road to Rome: Exercise Keay, BJSM 2017

 

 

Body Composition for Health and Sports Performance

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Body Composition from DEXA scan

Focusing on changes in body weight and body mass index (BMI) alone, as outcome measures of lifestyle interventions, ignores the beneficial multi-system and psychological effects of lifestyle medicine, in particular exercise. This includes advantageous changes in body composition for health and performance.

Why is body composition important? Because not all weight is equal in terms of tissue composition and distribution. To support optimal health, favourable levels of lean mass  versus fat mass decreases the risk of sarcopenia, associated bone loss and metabolic syndrome. For athletes, high lean mass coupled with low fat mass is related to improved athletic performance, especially in disciplines where strength to weight ratio a major consideration and/or those disciplines such as gymnastics and ballet where an aesthetic component confers a performance advantage.

The range of methods for measuring body composition have advantages and disadvantages in terms of accuracy, accessibility and expense. Although accurate in experienced hands, skin fold measurements are limited to giving a measure of subcutaneous fat. Impedance scales have the advantage of giving a measure of both total and visceral fat percentage, however accuracy is dependent on hydration status, amongst other variable factors. Dual-Energy X-Ray Absorptiometry (DEXA) scan is the “gold standard” for measuring body composition to include bone, lean and fat: both total and visceral. DEXA scan is relatively inexpensive and very low radiation dose compared to traditional X ray or computerised tomography (CT). This method of assessing body composition during training seasons is used by some professional sports teams. The illustration above shows a trained male with total fat in the athletic range. Although simple to measure, BMI does not accurately reflect body composition. All methods of assessing body composition can potentially have role in monitoring changes, for example over training seasons, and trends for individuals rather than relying on the absolute values of metrics measured.

How to go about optimising body composition? Combined exercise and nutritional strategies trigger and reinforce favourable metabolic and Endocrine signalling pathways. The detail of these lifestyle strategies will depend on the clinical context and the objectives of the individual: ranging from a sedentary person trying to improve health and well being, to an athlete aiming to improve sport performance. In all scenarios protein intake is an important factor in supporting lean mass, alongside tailored exercise/training. Temporal considerations for optimising body composition in athletes include the age of the athlete and targeting key competitions during a training cycle and in long term over athletic career. Ultimately optimising body composition has to translate to improved athletic performance for the endurance athlete. So aiming for “high quality weight loss” with retention or even improved lean mass, is more likely to support performance, rather than focusing on fat mass loss in isolation, which may occur in any case as a secondary consequence of integrated periodised training, nutrition and recovery. Striving for weight loss and reduced fat mass without careful monitoring and attention to effects on performance, can run the risk of athletes developing relative energy deficiency in sports (RED-S). Female athletes with functional hypothalamic amenorrhoea have been shown to decreased levels not only of lean and fat mass, but in addition reduced metabolically active brown fat and the associated hormone isirin which promotes fat “browning” and impacts bone mineralisation. In addition, there are differences between male and female athletes to be considered in terms of body composition and cycling performance.

From middle-age, both lean mass and bone mineral density (BMD) decline: sarcopenia and bone health intertwined. In order to mitigate against these changes, resistance exercise is particularly beneficial to stimulate muscle and load the skeleton and for metabolic and cognitive benefits. BMI is particularly misleading as a metric to assess risk of disease in menopausal women. Rather, the finer detail of body composition, for example visceral fat area, is more informative in terms of metabolic and psychological health.

Body composition is a more reliable indicator of health than body weight or BMI. Nevertheless body composition in isolation is not the sole determinant of health and performance. Rather body composition is just one of many multi-system effects mediated by integrated metabolic and Endocrine signalling pathways. These network effects are driven by lifestyle factors including exercise, nutrition and recovery, to determine health and sports performance.

For more discussion and debate on the role of body composition for health and performance BASEM Spring Conference 2018 6 CPD points from FSEM and BJSM approved for international education

BAsem2018_SpringConf_BJSMFSEM_CPD_AwardScreen Shot 2017-12-12 at 14.47.15

References

Challenging those hard to shift, big fat obesity risks BMJ 2017; 359: j5303 British Journal of Medicine 2017

Lifestyle Choices for optimising health: exercise, nutrition, sleep British Journal of Sport Medicine 2107

One road to Rome: Exercise British Journal of Sport Medicine 2107

Current Status of Body Composition Assessment in Sport Review and Position Statement on Behalf of the Ad Hoc Research Working Group on Body Composition Health and Performance, Under the Auspices of the I.O.C.Medical Commission

International society of sports nutrition position stand: diets and body composition Journal of the International Society of Sports Nutrition 2017
Case-Study: Body Composition Periodization in an Olympic-Level Female Middle-Distance Runner Over a 9-Year Career International Journal of Sport Nutrition and Exercise Metabolism 2017

Body composition assessment of English Premier League soccer players: a comparative DXA analysis of first team, U21 and U18 squads Journal of Sports Sciences

Protein Recommendations for Weight Loss in Elite Athletes: A Focus on Body Composition and Performance International Journal of Sport Nutrition and Exercise Metabolism 2017

Optimal Health: For All Athletes! Part 4 – Mechanisms British Association for Sport and Exercise Medicine 2017

Effect of Chronic Athletic Activity on Brown Fat in Young Women Plos One 2106

Irisin levels are lower in young amenorrheic athletes compared with eumenorrheic athletes and non-athletes and are associated with bone density and strength estimates Plos One

Kings and Queens of the Mountains Science4Performance

Low bone mineral density in middle-aged women: a red flag for sarcopenia Menopause 2017

Resistance training – an underutilised drug available in everybody’s medicine cabinet BJSM 2017

Benefits of resistance training in physically frail elderly: a systematic review Ageing Clinical and Experimental Research 2017

Is BMI a valid measure of obesity in postmenopausal women? Menopause 2017

Association of visceral fat area with the presence of depressive symptoms in Chinese postmenopausal women with normal glucose tolerance Menopause 2017