Muscle damage, physiological changes, and energy balance in ultra-endurance mountain-event athletes A Spanish group has examined specific biochemical and physiological changes after a mountain ultramarathon. In 11 runners, an increase in myoglobin, creatine kinase, lactate dehydrogenase, troponin I, leukocytes, as well as thrombocytes.
The barrel led to an energy deficit with the decrease in body weight and the sizes of the extremities. All numbers can be found under https://pubmed.ncbi.nlm.nih.gov/27447685/