Dietary Effects on Exercising Muscle Metabolism and Performance by 31P-MRS

To determine how diet modulates short-term exercise capacity, skeletal muscle pH, and bioenergetic state were examined by 31P-magnetic resonance spectroscopy (MRS) in nine healthy volunteers. Subjects performed incremental quadriceps exercise to exhaustion following 5 day of high-CHO (HCHO) or high-...

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Bibliographic Details
Main Authors: Larson, D. E, Hesslink, Robert L, Pozos, Robert S, Wiley, Rudolf A, Hrovat, Mirko I
Format: Report
Language:English
Subjects:
CAPACITY(QUANTITY)
CELLS(BIOLOGY)
DIET
EFFICIENCY
EXERCISE(PHYSIOLOGY)
Food, Food Service and Nutrition
GAS EXCHANGE(BIOLOGY)
LUNG
MEASUREMENT
MILITARY PERSONNEL
MIXING
MUSCLES
MUSCULOSKELETAL SYSTEM
PE63706N
PEAK VALUES
Personnel Management and Labor Relations
PH FACTOR
PHOSPHORYLATION
PHYSICAL FITNESS
RATIOS
RESPIRATORY SYSTEM
SHORT RANGE(TIME)
Stress Physiology
SYNCHRONISM
TIME
VENTILATION
WU6203
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Summary:To determine how diet modulates short-term exercise capacity, skeletal muscle pH, and bioenergetic state were examined by 31P-magnetic resonance spectroscopy (MRS) in nine healthy volunteers. Subjects performed incremental quadriceps exercise to exhaustion following 5 day of high-CHO (HCHO) or high-fat (HFAT) diet which were randomly assigned in cross-over fashion and separated by a 2.5 day period of ad libitum mixed diet. Simultaneous measurements were made of pulmonary gas exchange, minute ventilation, and quadriceps muscle pH and phosphorylation potential. At rest and peak exercise, respiratory exchange ratio and VE were higher following HCHO vs. HFAT (pO.O5), but exercise duration was (339 + or - 34 vs. 3O8 + or -25 sec, HCHO vs. HFAT; p