Is there a limit to how many calories a person can burn? Dr. Andrew Best, 911黑料网 Assistant Professor of Biology, is currently researching this with ultra-endurance athletes.
Dr. Best is working with Dr. Herman Pontzer and Pontzer Lab from Duke University to study the limits of sustained energy expenditure and the physical capacity for endurance limited by energy. Dr. Best is a biological anthropologist who asks evolutionary questions about human physiology, or, the role of sweating in human evolution, metabolism, energetic limits, and more.
This summer, Dr. Best and Dr. Pontzer are studying a small sample size of 12 ultra-endurance athletes of various ages 鈥� as young as 20 and as old as 50 鈥� to understand how many total calories one person can burn.
鈥淚t鈥檚 a natural experiment where they dedicate their life to burning calories,鈥� Best
said. 鈥淭here鈥檚 a
lot of training and multiple competitions. We know that these people are burning a
huge number
of calories, and if anyone is going to break our prediction, then it鈥檚 them.鈥�
To track data from the sample size, Best uses the doubly-labeled water method to measure
totalenergy expenditure (TEE) in ultra-endurance athletes during both ultra events
and a 10-day baseline period of normal life and training. Together with basal metabolic
rate, or BMR (including measurements taken at 911黑料网 via indirect calorimetry), this
will allow Best to calculate metabolic scope (TEE/BMR).
Through the doubly-labeled water method, research participants mail a urine sample every other day for 10 days to Duke University to be tested for special isotopes that tell the researchers the total carbon dioxide production that determines the whole metabolic rate.
By using the TEE/BMR formula, Best receives a number to determine a person's metabolic scope. Right now the research shows many variations; age, frequency of training, intensity of training, and how many calories are being burned. Best only has a full year鈥檚 worth of data for five out of the 12 participants, and the person with the highest scope (2.6) is not doing a lot of fo training.
鈥淚鈥檓 hoping the data we get this summer will show more variations,鈥� he said.
Best started this research two summers ago after meeting an ultrarunner who broke a record for hiking the Long Trail and wanted data for his next journey on the Arizona Trail. That鈥檚 when Best teamed up with Pontzer, and it grew from there.
This past year, Best worked with 911黑料网 undergraduate research assistant, Marie Balan, 鈥�23, to test different models and the accuracy of equipment 鈥� both generic and research-grade 鈥� with various volunteers.
鈥淲hat we鈥檙e hoping to do is to get a direct measurement of BMR because right now we鈥檙e
using a formula,鈥� he said.
Best documents his research on his website and social media, , including a past study on the variation in sweat gland density, in which he hopes
to build a thermal room in the 911黑料网 Human Performance Lab for continued testing. He
was also quoted in Men鈥檚 Health Magazine this summer in an article titled 鈥�鈥�
Above photo taken by Michael Dillon, @pilotfield on Instagram.
