Resting metabolic rate (RMR) and body composition were evaluated in 12 healthy volunteers before and after 16 days of high altitude trekking and climbing. RMR was measured by indirect calorimetry and body composition by electrical impedance, A 29% reduction in energy intake during high altitude exposure was observed. Fat mass loss averaged about 2.2 kg (p<0.05) and lean body mass about 1.1 kg, which was almost significant (p=0.07). As expected, estimated RMR at the end of the expedition - calculated by predictive formulae including body fat and lean body mass as covariates - was significantly reduced by 119 kcal/day as a consequence of the reduction in body weight, Measured RMR values, on the contrary, did not show any significant decline, In conclusion our study showed that high altitude trekking induced a weight loss due approximately 2/3 rds to fat mass and 1/3 rd to lean body mass. Decreased energy efficiency, which was still present several days after returning to sea level, may have helped contribute to weight loss due to reduced energy intake.

The effects of high altitude trekking on body composition and resting metabolic rate

Zamboni, M;Robbi, R;Bissoli, L;Bosello, O
1997-01-01

Abstract

Resting metabolic rate (RMR) and body composition were evaluated in 12 healthy volunteers before and after 16 days of high altitude trekking and climbing. RMR was measured by indirect calorimetry and body composition by electrical impedance, A 29% reduction in energy intake during high altitude exposure was observed. Fat mass loss averaged about 2.2 kg (p<0.05) and lean body mass about 1.1 kg, which was almost significant (p=0.07). As expected, estimated RMR at the end of the expedition - calculated by predictive formulae including body fat and lean body mass as covariates - was significantly reduced by 119 kcal/day as a consequence of the reduction in body weight, Measured RMR values, on the contrary, did not show any significant decline, In conclusion our study showed that high altitude trekking induced a weight loss due approximately 2/3 rds to fat mass and 1/3 rd to lean body mass. Decreased energy efficiency, which was still present several days after returning to sea level, may have helped contribute to weight loss due to reduced energy intake.
trekking
high altitude
resting metabolic rate
body composition
total body water
impedance
Adult
Diet
Energy Intake
Energy Metabolism
Female
Humans
Kinetics
Male
Middle Aged
Walking
Altitude
Basal Metabolism
Body Composition
Weight Loss
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11562/1038596
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