TY - JOUR
T1 - Effect of breed of horse on muscle carnosine concentration
AU - Bump, K. D.
AU - Lawrence, L. M.
AU - Moser, L. R.
AU - Miller-Graber, P. A.
AU - Kurcz, E. V.
PY - 1990
Y1 - 1990
N2 - 1. 1. Muscle samples from the M. gluteus médius were obtained from six Quarter Horses (QH), six Thoroughbreds (TB), and five Standardbreds (SB) to determine carnosine values and fiber type percentages. 2. 2. Muscle biopsies were for fiber type percentages and carnosine concentration. 3. 3. QH had a lower percentage of slow twitch oxidative fibers and a higher percentage of past twitch glycolytic fibers than SB or TB. 4. 4. Fast twitch oxidative-glycolytic fibers were lowest in the QH. 5. 5. The QH had mean carnosine values significantly greater (P < 0.01) than the mean values for SB and TB. 6. 6. Across breeds muscle carnosine concentration was positively correlated (P < 0.05; r = 0.53) with fast twitch glycolytic fiber percentage and negatively correlated (p < 0.05; r = - 0.51) with fast twitch oxidative fiber percentage. 7. 7. Free intramuscular carnosine is believed to function as an intracellular buffer. Since carnosine was highest in the muscle of horses with the greatest percentage of fast twitch glycolytic fibers, these data are consistent with the proposed function of this dipeptide.
AB - 1. 1. Muscle samples from the M. gluteus médius were obtained from six Quarter Horses (QH), six Thoroughbreds (TB), and five Standardbreds (SB) to determine carnosine values and fiber type percentages. 2. 2. Muscle biopsies were for fiber type percentages and carnosine concentration. 3. 3. QH had a lower percentage of slow twitch oxidative fibers and a higher percentage of past twitch glycolytic fibers than SB or TB. 4. 4. Fast twitch oxidative-glycolytic fibers were lowest in the QH. 5. 5. The QH had mean carnosine values significantly greater (P < 0.01) than the mean values for SB and TB. 6. 6. Across breeds muscle carnosine concentration was positively correlated (P < 0.05; r = 0.53) with fast twitch glycolytic fiber percentage and negatively correlated (p < 0.05; r = - 0.51) with fast twitch oxidative fiber percentage. 7. 7. Free intramuscular carnosine is believed to function as an intracellular buffer. Since carnosine was highest in the muscle of horses with the greatest percentage of fast twitch glycolytic fibers, these data are consistent with the proposed function of this dipeptide.
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U2 - 10.1016/0300-9629(90)90064-Y
DO - 10.1016/0300-9629(90)90064-Y
M3 - Article
C2 - 1975537
AN - SCOPUS:0025296658
SN - 0300-9629
VL - 96
SP - 195
EP - 197
JO - Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology
JF - Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology
IS - 1
ER -