scholarly journals Ketogenic diet benefits body composition and well-being but not performance in a pilot case study of New Zealand endurance athletes

Author(s):  
Caryn Zinn ◽  
Matthew Wood ◽  
Mikki Williden ◽  
Simon Chatterton ◽  
Ed Maunder
Sports ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 131
Author(s):  
Amy-Lee Bowler ◽  
Remco Polman

Background: Recently, a focus has been placed on investigating the potential benefits of adherence to a ketogenic diet in enhancing body composition, physical health, psychological well-being, and performance of athletes from various sporting disciplines. As the available research is yet to be collated and analyzed in a single review, this scoping review aims to analyze and draw conclusions from the available literature that exists on the efficacy of a ketogenic diet among athletic populations. Methods: Several primary research databases and any relevant citation lists were searched to locate appropriate studies for inclusion in this scoping review. Studies that investigated the effects of adherence to a ketogenic diet (KD), defined by a carbohydrate intake of less than 5% of total energy intake, on body composition, physical health, psychological well-being, and performance among an athletic population were included in the review. From 814 articles screened, 12 were identified as meeting the inclusion criteria and were included in the final scoping review. Results: Adherence to a KD has beneficial effects on body weight and fat mass. Varying effects were identified on physical health with the diet, eliciting positive effects on fat oxidation but potentially deleterious effects on stool microbiota and iron metabolism. Conflicting results were reported regarding the effects of a KD on sporting performance. Benefits were reported regarding athlete well-being following commencement of a KD, but only after week two. Conclusions: The results of this scoping review demonstrate that there are both beneficial and detrimental effects associated with adherence to a KD among athletic populations. It is understood that further research is required to make any concrete recommendations regarding a KD to athletes.


2020 ◽  
Vol 15 (1) ◽  
pp. 146-150
Author(s):  
Ed Maunder ◽  
Andrew E. Kilding ◽  
Christopher J. Stevens ◽  
Daniel J. Plews

A common practice among endurance athletes is to purposefully train in hot environments during a “heat stress camp.” However, combined exercise-heat stress poses threats to athlete well-being, and therefore, heat stress training has the potential to induce maladaptation. This case study describes the monitoring strategies used in a successful 3-week heat stress camp undertaken by 2 elite Ironman triathletes, namely resting heart rate variability, self-report well-being, and careful prescription of training based on previously collected physiological data. Despite the added heat stress, training volume very likely increased in both athletes, and training load very likely increased in one of the athletes, while resting heart rate variability and self-report well-being were maintained. There was also some evidence of favorable metabolic changes during routine laboratory testing following the camp. The authors therefore recommend that practitioners working with endurance athletes embarking on a heat stress training camp consider using the simple strategies employed in the present case study to reduce the risk of maladaptation and nonfunctional overreaching.


Author(s):  
Amohia Boulton

Indigenous peoples across the world have a shared experience of colonisation; a process that has resulted in war, disease and the decimation of their lands, homes and peoples. In New Zealand, the effects of colonisation are still evident with Māori (the indigenous people of New Zealand) experiencing poorer outcomes compared with non-Māori citizens across a range of social, health and well-being indicators. This paper is a case study of work being done in New Zealand, which may have resonance with work in South Africa, and other countries with a history of colonisation. It begins with a brief history of the impacts of colonisation on Māori before considering the concept of decolonisation. The author outlines the work her organisation does as an independent, tribally owned, Māori health research centre to advance a decolonisation agenda. Reflecting on their emancipatory and democratising ambitions as researchers provides the opening for a discussion about indigenous ethics. The paper presents a number of Māori ethical principles that guide their work, arguing that were such principles applied in the development and implementation of social policy and legislation, the effect would be a fairer, more equitable policy that better meets the needs of Māori as citizens. Recent legislation enacted to improve New Zealand’s care and protection system for children is discussed to illustrate the need for greater consideration of Māori values when developing legislation that directly impacts Māori. The paper concludes with a challenge to policymakers, practitioners, academics, and researchers alike to actively contribute to an agenda of liberation, emancipation and decolonisation for indigenous peoples.


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