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• W4387056175 abstract "Self-supported backpacking treks are popular among a subset of the active population, yet the grueling duration in unpredictable conditions furnishes a low success rate. However, the physiological consequences of multi-month backpacking treks in the wilderness remain unclear. PURPOSE: Observe the effects of a multi-month, self-supported backpacking trek in the wilderness on body composition and resting metabolism. METHODS: An experienced backpacker (30.1 yrs; 78.3 kg; 179.1 cm; 20.5% BF; 35.2 kg SMM) completed a wilderness-based backpacking trek known as the Appalachian National Scenic Trail northbound thru-hike. The participant hiked 3,531 km with an accumulated elevation gain of 99,643 m over 139 days. Body composition and resting metabolism data were collected at 6 time points (PRE-, MID-, POST-, 1-WK, 2-WK, and 4-WK-POST). Body composition was assessed via multi-frequency BIA with urine specific gravity hydration confirmation. Indirect calorimetry via metabolic cart was used to determine resting metabolism under fasted and standardized conditions. Data are reported as percent changes from pre-trek baseline (PRE). RESULTS: The participant lost 2.68 kg (-3.42%) body weight (BW) over the 139-d trek defined by a 4.5 kg (-27.98%) fat mass (FM) loss and a 0.9 kg (2.6%) skeletal muscle mass (SMM) gain. Specifically, visceral adipose tissue area (VAT, PRE 66.0cm2, POST 47.1cm2, -28.6%) and body fat percentage (BF%, PRE 20.5%, POST 15.4%, -24.9%) decreased in response to trek demands. 1-WK-POST trek, BW (1.4%), FM (1.7%), SMM (1.2%), VAT (-2.4%), and BF% (1.0%) returned to near-baseline levels (PRE) and were maintained through 4-WK-POST. Trek demands increased resting energy expenditure and reliance on carbohydrate metabolism at rest, peaking 1-WK-POST (REE: PRE 2035 kcal/d, 1-WK 2291 kcal/d, 12.6%; RQ: PRE 0.80, 1-WK 1.03, 28.7%) before returning to near-baseline levels 4-WK-POST (REE: 2054 kcal/d, 0.9%; RQ: 0.84, 5.0%). CONCLUSION: Completing a 139-d self-supported backpacking event in the wilderness positively alters body composition in response to greater stress, activity exposure, and overall metabolic demand. Upon relief of significant daily activity, stress demands, and caloric modification, the physiological system quickly reverts to the previously established metabolic baseline." @default.
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• W4387056175 date "2023-09-01" @default.
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• W4387056175 title "Impact Of A Multi-month Wilderness Backpacking Trek On Body Composition And Resting Metabolism: A Case Study" @default.
• W4387056175 doi "https://doi.org/10.1249/01.mss.0000979952.17710.3b" @default.
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