The energy requirements and metabolic benefits of wilderness hunting in Alaska.

Autor: Coker RH; Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, Alaska., Coker MS; School of Management, University of Alaska Fairbanks, Fairbanks, Alaska., Bartlett L; Pristine Ventures, Inc, Fairbanks, Alaska., Murphy CJ; Isotope Ratio Core Laboratory, University of Wisconsin-Madison, Madison, Wisconsin., Priebe K; Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, Alaska., Shriver TC; Isotope Ratio Core Laboratory, University of Wisconsin-Madison, Madison, Wisconsin., Schoeller DA; Isotope Ratio Core Laboratory, University of Wisconsin-Madison, Madison, Wisconsin., Ruby BC; Montana Center for Work Physiology and Exercise Metabolism, University of Montana, Missoula, Montana.
Jazyk: angličtina
Zdroj: Physiological reports [Physiol Rep] 2018 Nov; Vol. 6 (21), pp. e13925.
DOI: 10.14814/phy2.13925
Abstrakt: The purported healthy aspects of subsistence foods have led to the popularity of the Paleo diet. There has been very little focus, surprisingly, on health benefits derived from the nomadic nature of humans during the Paleolithic era. The purpose of our study was to examine total energy expenditure (TEE), total energy intake (TEI), body composition, blood lipids, and intrahepatic lipid in humans during a 12-day Alaskan backcountry expeditionary hunting (ABEH) immersion. Four healthy men (age: 42 ± 3 year, BMI: 27 ± 1 kg/m 2 ) were recruited for the study. TEE was measured using the doubly labeled water method and a food diary was utilized to assess TEI. Body composition was measured using dual energy X-ray absorptiometry (DXA); cross-sectional area of the thigh (XT) and intrahepatic lipid (IHL) were measured using molecular imaging. Blood samples were collected for the measurement of blood lipids. DXA, XT, IHL, and blood data were collected pre- and immediately post-ABEH. Results were analyzed using paired t-tests and considered significant at P < 0.05. TEE and TEI averaged 18.1 ± 1.2 and 9.1 ± 2.5 MJ/day, respectively, indicating substantial negative energy balance (-9.0 ± 1.3 MJ/day). There was a reduction in percent body fat (∆-3.3 ± 0.2%), total fat mass (∆-3.3 ± 0.4 kg), and visceral fat volume (Δ-261 ± 188 cm 3 ). Lean tissue mass and XT was unchanged. There was a decrease in IHL (Δ-0.5 ± 0.1% water peak), and a trend (P = 0.055) toward reduction in LDL-cholesterol. We conclude that constancy of physical activity during negative energy balance may provide metabolic benefits above and beyond variations in diet that exist with the hunter-gatherer lifestyle.
(© 2018 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of The Physiological Society and the American Physiological Society.)
Databáze: MEDLINE
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