Training, muscle volume, and energy expenditure in nonobese American girls

1  Department of Pediatrics, University of California, Irvine College of Medicine, Orange 92868; 3  Harbor-University of California Los Angeles Medical Center, Torrance, California 90509; and 2  Connecticut Children's Medical Center and Department of Pediatrics, University of Connecticut Health...

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Published in:Journal of applied physiology (1985) 2001-01, Vol.90 (1), p.35-44
Main Authors: Eliakim, Alon, Scheett, Tim, Allmendinger, Nicki, Brasel, Jo Anne, Cooper, Dan M
Format: Article
Language:English
Subjects:
Biological and medical sciences
Body Height
Body Mass Index
Body Weight
Child
Cross-Sectional Studies
Drinking water
Energy Metabolism
Exercise
Female
Fundamental and applied biological sciences. Psychology
Girls
Heart - physiology
Humans
Lung - physiology
Muscle, Skeletal - anatomy & histology
Muscular system
NMR
Nuclear magnetic resonance
Oxygen Consumption
Physical Education and Training
Physical Endurance
Physical Fitness
Prospective Studies
Reference Values
Respiratory system
Teenagers
Thigh
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
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Summary:1  Department of Pediatrics, University of California, Irvine College of Medicine, Orange 92868; 3  Harbor-University of California Los Angeles Medical Center, Torrance, California 90509; and 2  Connecticut Children's Medical Center and Department of Pediatrics, University of Connecticut Health Center, Farmington, Connecticut 06030 Little is known about the relationship among training, energy expenditure, muscle volume, and fitness in prepubertal girls. Because physical activity is high in prepubertal children, we hypothesized that there would be no effect of training. Forty pre- and early pubertal (mean age 9.1 ± 0.1 yr) nonobese girls enrolled in a 5 day/wk summer school program for 5 wk and were randomized to control ( n  = 20) or training groups ( n  = 20; 1.5   h/day, endurance-type exercise). Total energy expenditure (TEE) was measured using doubly labeled water, thigh muscle volume using magnetic resonance imaging, and peak O 2 uptake ( O 2 peak ) using cycle ergometry. TEE was significantly greater (17%, P  <   0.02) in the training girls. Training increased thigh muscle volume (+4.3 ± 0.9%, P  
ISSN:8750-7587
1522-1601
DOI:10.1152/jappl.2001.90.1.35