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To investigate the influence of carbohydrate (CHO) consumption on the acute hormonal
response, and chronic adaptation to weight lifting exercise, two studies were conducted.
Following a four-hour fast, seven young men (21.3 ± 3.5 y) performed (on two occasions)
a nine-station weight lifting protocol, completing 3 sets of 10 repetitions at 75%
of IRM (series 1). Randomly assigned, one session included the ingestion of a non-caloric
placebo, and the other, a 6% CHO solution. For series 2, two groups of young men (21.3±1.5
y) participated in 12 weeks of progressive resistance weight training. Training for
one group included the ingestion of a non-caloric placebo, and the other, a 6% CHO
solution. In series 1, weight lifting exercise with CHO ingestion significantly (p
< 0.05) elevated blood glucose and plasma insulin levels above baseline, as well as
that occurring with the placebo. This resulted in a significant blunting of the cortisol
response (7% with CHO compared to 99% with placebo). These findings indicate that
CHO consumption during weight lifting exercise can modify the acute hormonal response
to exercise. With series 2, CHO consumption continued to blunt the cortisol response
to exercise during the twelve weeks of training. This is in contrast to significantly
elevated cortisol levels observed for the placebo control group. Corresponding with
the modified response patterns were differences in muscle growth. Weight training
exercise with CHO ingestion resulted in significantly greater gains in both type I
(19.1%) and type II (22.5%) muscle fibre area than weight training exercise alone.
The difference in the cortisol response accounted for 74% of the variance (r= 0.8579,
p= 0.006) of change in type I muscle fibre area, and 52.3% of the variance (r= 0.7231,
p= 0.043) of change in type II muscle fibre area. These findings suggest that the
modification of the cortisol response associated with CHO ingestion can positively
impact the skeletal muscle hypertrophic adaptation to weigh training.
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References
- Effects of synthetic hyperinsulinemia on amino acid flux across human leg in postabsorptive state.Am. J. Phys. 1991; 260: E46-E52
- Inability to stimulate skeletal muscle or whole body protein synthesis in type I (insulin dependent) diabetic patients by insulin-plus-glucose during amino acid infusion: studies of incorporation and turnover of tracer L-[13C] leucine.Diabetologia. 1990; 33: 43-51
- The histologic analysis of human muscle biopsies with regard to fiber types. Adult male and female.Neurology. 1969; 19: 221-223
- Insulin and muscle protein.in: Steiner DF Freinkel N Handbook of Physiology: Endocrinology. 1. 1972: 563-577
- Effect of leucine and plasma amino acid concentrations on leucine metabolism in man.J Clin Invest. 1987; 80: 1784-1793
- Reproductive hormone response to resistance exercise.Med Sci Sports Exerc. 1987; 19: 234-238
- Effect of exercise on synthesis and degradation of muscle protein.Biochem J. 1980; 188: 255-262
- Increased excretion of urea and N-methylhistadine by rats and humans after a bout of exercise.J Appl Physiol. 1982; 52: 27-33
- The effects of intermittent liquid meal feeding on selected hormones and substrates during intense exercise.Int J Sports Med. 1993; 3: 67-75
- Hormonal control of muscle growth.Muscle & Nerve. 1987; 10: 577-598
- Effects of insulin, glucose, and amino acids on protein turnover in rat diaphragm.J Biol Chem. 1975; 250: 290-298
- Effects of physiologic hyperinsulinemeia on skeletal muscle protein synthesis and breakdown in man.J Clin Invest. 1987; 80: 1-6
- Influence of insulin and contractile activity on muscle size and protein balance.Diabetes. 1979; 28: 18-24
- Relationship between cortisone and muscle work in determining muscle size.J Physiol. 1969; 200: 667-675
- Influence of adaptation of physical effort on nitrogen balance in man.Nutr Rep Int. 1975; 11: 231-236
- Effect of testosterone on muscle mass and muscle protein synthesis.J Appl Physiol. 1989; 66: 498-503
- Hormone and metabolite response to weight lifting training session.Int J Sports Med. 1986; 7: 100-107
- Acute hormonal responses to two different fatiguing heavy-resistance protocols in male athletes.J Appl Physiol. 1993; 74: 882-887
- Exercise and protein intake effects on urinary 3-methylhistadine excretion.Am J Clin Nutr. 1985; 41: 246-253
- Role of insulin in the regulation of protein synthesis.Diabetes. 1980; 29: 487-494
- Effects of different heavy-resistance exercise protocols on plasma flendorphin concentrations.J Appl Physiol. 1993; 74: 450-459
- Endogenous anabolic hormonal and growth factor responses to heavy resistance exercise in males and females.Int J Sport Med. 1991; 12: 228-235
- Effects of heavy-resistance training on hormonal response patterns in younger vs. older men.J. Appl. Physiol. 1999; 87: 982-992
- Hormonal and growth factor responses to heavy resistance exercise protocols.J Appl Physiol. 1990; 69: 1442-1450
- Protein requirements and muscle mass/strength changes during intensive training in novice body builders.J Appl Physiol. 1992; 73: 767-775
- Effects of food deprivation on protein synthesis and degradation in rat skeletal muscle.Am J Physiol. 1976; 231: 441-448
- Diminished insulin response in highly trained athletes.Metabolism. 1978; 27: 521-524
- Protein degradation in human skeletal muscle tissue: The effect of insulin, leucine, amino acids, and ions.Clin Sci. 1981; 60: 319-326
- Role of thyroid, insulin, and corticosteroid hormones in the physiological regulation of proteolysis in muscle.Progress in Clinical and Biological Research. 1985; 180: 531-542
- Insulin selectively attenuates breakdown of non-myofibrillar proteins in peripheral tissue of normal men.Am J Physiol. 1994; 266: E645-E652
- Failure of insulin infusion to stimulate fractional muscle protein synthesis in type I diabetic patients.Diabetes. 1989; 38: 618-624
- Urinary 3-methylhistadine excretion increases with repeated weight training exercise.Med Sci Sports Exerc. 1989; 21: 283-287
- Protein and amino acid turnover during and after exercise.Biochem Soc Trans. 1980; 8: 499-501
- Properties of protein turnover in animal cells and a possible role for turnover in “quality” control of proteins.in: Reich E Proteases and Biological Control. Cold Springs Harbor Laboratory, Baltimore1975: 515-530
- The catabolic effect of glucocorticoids on different types of skeletal muscle fibers and its dependence upon muscle activity and interaction with anabolic steroids.J Steroid Biochem. 1982; 16: 349-352
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© 2001 Published by Elsevier Inc.
