Effects of Oolong Tea Supplementation on Bone Mineral Density and Bone-Related Markers in Ovariectomized Rats

난소 절제 쥐에서 우롱차의 섭취가 골밀도 및 골대사 지표에 미치는 영향

  • Jung, Yun-Jung (Dept. of Food and Nutrition. Keimyung University) ;
  • Choi, Mi-Ja (Dept. of Food and Nutrition. Keimyung University)
  • 정윤정 (계명대학교 식품영양학과) ;
  • 최미자 (계명대학교 식품영양학과)
  • Received : 2012.05.17
  • Accepted : 2012.08.23
  • Published : 2012.08.31

Abstract

Polyphenols may be primarily responsible for the health benefits associated with tea consumption. However, the benefits of the tea polyphenols to bone health have not been studied well. The purpose of this study was to investigate the effects of Oolong tea on bone mineral density and bone-related markers in ovariectomized rats. Sprague-Dawley female rats were randomly assigned to Sham-Control, Sham-Oolongtea, Ovx-Control, and Ovx-Oolongtea groups. Bone mineral density (BMD) and bone mineral content (BMC) were estimated by using PIXImus (GE Lunar Co, Wisconsin.) in the spine and femur. After 6 weeks of the experimental diets, body weight gain, food intake, and food efficiency ratio (FER) were significantly higher in Ovx groups than in Sham groups regardless of diet. The serum concentration of calcium, phosphorus, ALP, and calcitonin were not significantly different according to Oolong tea supplementation. There were no significant differences in urinary calcium and phosphorus excretion between all groups. The urinary DPD crosslinks value was significantly higher in the Ovx-Control group than in the Sham-Oolongtea group. Spine BMD, femur BMD, and spine BMD per body weight were significantly lower in the Ovx groups than in the Sham groups regardless of diet. In the OVX group, spine BMC per body weight, femur BMD per body weight and femur BMC per body weight were significantly higher in the Oolong tea groups than in Control groups. It was concluded that Oolong tea supplementation positively influenced bone health in ovariectomized rats.

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