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Branch chain amino acids and equine endurance

Equine endurance exercise alters serum branched-chain amino acid and alanine concentrations

N. L. TROTTIER*, B. D. NIELSEN , K. J. LANG, P. K. KU and H. C. SCHOTT† 

EQUINE EXERCISE PHYSIOLOGY 6 Equine vet. J., Suppl. 34 (2002) 168-172

Six 2-year-old Arabian horses were used to determine
whether 60 km prolonged endurance exercise
(approximately 4 h) alters amino acid concentrations in
serum and muscle, and the time required for serum amino
acid concentrations to return to basal resting values. Blood
and muscle samples were collected throughout exercise and
during a 3 day recovery period. Isoleucine concentration in
muscle tended to increase and leucine and valine did not
change due to exercise. Serum alanine concentrations did not
increase immediately after exercise, but increased at 24, 48
and 72 h postexercise. Serum isoleucine, leucine, and valine
concentrations decreased after exercise and time required to
reach pre-exercising concentrations was 48 h. In conclusion,
endurance exercise in the horse decreases serum isoleucine,
leucine, and valine concentrations, and increases serum
alanine concentration. The decrease in serum branchedchain
amino acid concentrations did not correspond to a
measurable increase in total muscle branched-chain amino
acid concentrations.

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