Energy expenditure during 2-day trail walking in the mountains (2,857 m) and the effects of amino acid supplementation in older men and women

We compared relative exercise intensity and active energy expenditure (AEE) on trail walking in the mountains, with those of daily exercise training, and whether branched-chain amino acid (BCAA) and arginine supplementation attenuated the release of markers indicating muscle damage and declines in p...

Full description

Saved in:
Bibliographic Details
Published in:European journal of applied physiology 2012-03, Vol.112 (3), p.1077-1086
Main Authors: Shimizu, Muneshige, Miyagawa, Ken, Iwashita, Soh, Noda, Tsuneyuki, Hamada, Koichiro, Genno, Hirokazu, Nose, Hiroshi
Format: Article
Language:English
Subjects:
Age Factors
Aged
Amino acids
Amino Acids - administration & dosage
Amino Acids - pharmacology
Biological and medical sciences
Biomedical and Life Sciences
Biomedicine
Carbohydrates
Dehydrogenases
Dietary Supplements
Drinking - drug effects
Drinking - physiology
elderly
Energy
Energy Metabolism - drug effects
Energy Metabolism - physiology
Exercise intensity
Female
Females
Fundamental and applied biological sciences. Psychology
Heart rate
Heart Rate - drug effects
Heart Rate - physiology
Human Physiology
Humans
Hypotheses
Jumping
Male
males
Middle age
Middle Aged
Mountaineering - physiology
Mountains
Muscle fatigue
Muscles
Occupational Medicine/Industrial Medicine
Older people
Original Article
Physical fitness
Placebos
Sex Factors
Sports Medicine
Time Factors
Training
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
Walking - physiology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We compared relative exercise intensity and active energy expenditure (AEE) on trail walking in the mountains, with those of daily exercise training, and whether branched-chain amino acid (BCAA) and arginine supplementation attenuated the release of markers indicating muscle damage and declines in physical performance. Twenty-one subjects (~63 years) were divided into two groups: amino acid (AA, 51 g of amino acids and 40 g of carbohydrate, male/female = 6/4) or placebo (PL, 91 g of carbohydrate, male/female = 6/5) supplementation during 2 days of trail walking in the mountains. We measured heart rate (HR), AEE, fatigue sensation, water and food intake, and sweat loss during walking. In addition, we measured peak aerobic capacity and heart rate (HR peak ) with graded-intensity walking, vertical jumping height (VJ) before and after walking. We found that average HR and AEE during uphill walking were ~100% HR peak and ~60% , while they were ~80 and ~20% during downhill walking, respectively. Moreover, average total AEE per day was sevenfold that of their daily walking training. VJ after walking remained unchanged compared with the baseline in AA ( P  > 0.2), while it was reduced by ~10% in PL ( P   0.4). The responses of other variables were not significantly different between groups (all, P  > 0.2). Thus, trail walking in the mountains required a high-intensity effort for older people, while the effects of BCAA and arginine supplementation were modest in this condition.
ISSN:1439-6319
1439-6327
DOI:10.1007/s00421-011-2057-2