Research Generally Supports the Theory That Caffeine May Enhance Performance

question 54

Multiple Choice

Research generally supports the theory that caffeine may enhance performance in long distance endurance events. Which of the following is the LEAST likely hypothesis?

• A) it may exert a direct effect on the muscles to increase muscle contractile force
• B) it stimulates the release of epinephrine from the adrenal gland
• C) it decreases the use of both free fatty acids and muscle glycogen
• D) it may exert a psychological stimulating effect
• E) it may decrease the perception of effort during exercise

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Definitions:

Heterozygotes

Individuals having two different alleles at a locus, resulting in a variation of a genetic trait.

Codominance

Effect in which the full and separate phenotypic effects of two alleles are apparent in heterozygous individuals.

Heterozygous

Genetic condition of having two different alleles at a locus on a chromosome.

Hybrid

A heterozygous individual.