Chicken Breast Attenuates High-Intensity-Exercise-Induced Decrease in Rat Sarcoplasmic Reticulum Ca2+ Handling
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Takaaki Mishima [1] ; Takashi Yamada [2] ; Makoto Sakamoto [3] ; Minako Sugiyama [3] ; Satoshi Matsunaga [5] ; Hirohiko Maemura ; Muneshige Shimizu [4] ; Yoshihisa Takahata ; Fumiki Morimatsu ; Masanobu Wada [3]
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[1] Osaka University of Health and Sport Sciences
Osaka University of Health and Sport Sciences
Kumatori Chō, Japón
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[2] Sapporo Medical University
Sapporo Medical University
Chūō-ku, Japón
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[3] Hiroshima University
Hiroshima University
Naka-ku, Japón
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[4] Tokai University
Tokai University
Japón
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[5] Miyazaki University
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- Localización: International journal of sport nutrition and exercise metabolism, ISSN 1526-484X, ISSN-e 1543-2742, Vol. 18, Nº. 4, 2008, págs. 399-411
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
This study was conducted to determine whether dietary chicken-breast extract (CBEX), a rich source of histidine-containing dipeptides, could modify exerciseinduced changes in sarcoplasmic reticulum (SR) function. After 5 weeks of dietary CBEX, SR Ca2+-handling ability was examined in the vastus lateralis muscles of rats subjected to high-intensity running for 2.5 min. Dietary CBEX caused an approximately 15% and 45% increase (p < .01) in muscle carnosine and anserine concentrations, respectively. In resting muscles, depressions in SR Ca2+–ATPase activity were evoked by dietary CBEX without concomitant changes in SR Ca2+ uptake and release rates. The data confirm that high-intensity exercise depresses SR Ca2+ handling. In spite of the same run time, SR Ca2+ handling was reduced to a lesser degree in muscles of CBEX-containing-chow-fed rats than in standard-chow-fed rats (p < .05). These results suggest that dietary CBEX might attenuate deteriorations in SR Ca2+-handling ability that occur with high-intensity exercise.
