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Titolo:
DIETARY-EFFECTS ON EXERCISING MUSCLE METABOLISM AND PERFORMANCE BY P-31-MRS
Autore:
LARSON DE; HESSLINK RL; HROVAT MI; FISHMAN RS; SYSTROM DM;
Indirizzi:
HARVARD UNIV,MASSACHUSETTS GEN HOSP,SCH MED,MASSACHUSETTS INST TECHNOL BOSTON MA 02114 HARVARD UNIV,MASSACHUSETTS GEN HOSP,SCH MED,MASSACHUSETTS INST TECHNOL BOSTON MA 02114 NIDDKD,CLIN DIABET & NUTR SECT PHOENIX AZ 85016 HARVARD UNIV,MASSACHUSETTS GEN HOSP,SCH MED,MASSACHUSETTS INST TECHNOL BOSTON MA 02114 USN,HLTH RES CTR SAN DIEGO CA 92128
Titolo Testata:
Journal of applied physiology
fascicolo: 3, volume: 77, anno: 1994,
pagine: 1108 - 1115
SICI:
8750-7587(1994)77:3<1108:DOEMMA>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC-RESONANCE SPECTROSCOPY; BLOOD LACTATE ACCUMULATION; HIGH-FAT DIET; PROLONGED EXERCISE; INCREMENTAL EXERCISE; ANAEROBIC THRESHOLD; GLYCOGEN DEPLETION; SKELETAL-MUSCLE; FATIGUE; INHIBITION;
Keywords:
GLYCOLYSIS; PHOSPHATE SPECTROSCOPY; PHOSPHOCREATINE; VENTILATION; SKELETAL MUSCLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
D.E. Larson et al., "DIETARY-EFFECTS ON EXERCISING MUSCLE METABOLISM AND PERFORMANCE BY P-31-MRS", Journal of applied physiology, 77(3), 1994, pp. 1108-1115

Abstract

To determine how diet modulates short-term exercise capacity, skeletal muscle pH and bioenergetic state were examined by P-31-magnetic resonance spectroscopy in nine healthy volunteers. Subjects performed incremental quadriceps exercise to exhaustion after 5 days of high-carbohydrate (HCHO) or high-fat (HFAT) diet randomly assigned in crossover 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 minute ventilation were higher after HCHO than after HFAT (P < 0.05), reflecting greater CHO utilization. Peak O-2 consumption VO2) was not increased after HCHO (P > 0.05), but exercise duration was (339 +/- 34 s for HCHO vs. 308 +/- 25 s for HFAT; P < 0.05). HCHO was associated with a blunted early fall of phosphocreatine (PCr)/P-i vs. VO2 (-4.1 +/- 0.7 x 10(-2) min/ml for HCHO vs. -5.6 +/- 1.2 X 10(-2) min/ml for HFAT; P < 0.05). On both study days, the slope of PCr/P-i vs. VO2, before and after the PCr threshold, was correlated with exercise time. The results suggest that a diet rich in CHO improves exercise efficiency through beneficial effects on intracellular phosphorylation potential.

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Documento generato il 13/07/20 alle ore 03:42:24