Too D, Wakayama E J, Locati L L, Landwer G E
Department of Physical Education and Sport, State University New York, Brockport 14420-2989, USA.
J Sports Med Phys Fitness. 1998 Sep;38(3):245-52.
The purpose of this investigation was to document the effect of a 10-wk precompetition bodybuilding diet and training, on blood chemistry and body composition.
One adult male, steroid and drug free, preparing for a first competition.
Average daily dietary intake consisted of 2263 calories (71% protein, 16% carbohydrate, 13% fats), with a protein intake of 5.0 gm.kg-1 body mass (BM). Initial body weight of 76.3 kgf (16% body fat) decreased to 63.4 kgf (4.4% body fat). Blood samples for electrolytes, TP, Alb, bilirubin, LDL-C, TG, UA, and amylase were normal. HDL-C levels increased from 65 to 89 mg.dL-1.
Decreased glucose levels (< 50 mg.dL-1), indicated hypoglycemia. Increased Mg, LD, and CK levels indicated intense training. Increased inorganic phosphorus from 3.7 to 8.2 mg.dL-1 suggested lactic acidosis. Increased BUN levels from 16 to 53 mg.dL-1 and creatinine from 1.1 to 1.8 mg.dL-1 may be attributed to a high protein diet. However, heart muscle enzyme (CK-MB) was not elevated.
Substantial changes in body composition and blood chemistry suggest adequate nutrition be ensured, and caution taken to avoid excessive physiologic stresses on the body during precompetition diet and training.
本研究的目的是记录为期10周的赛前健美饮食和训练对血液化学成分和身体成分的影响。
一名成年男性，未使用类固醇和药物，准备参加首次比赛。
平均每日饮食摄入量为2263卡路里（71%为蛋白质，16%为碳水化合物，13%为脂肪），蛋白质摄入量为5.0克/千克体重（BM）。初始体重76.3千克力（体脂率16%）降至63.4千克力（体脂率4.4%）。电解质、总蛋白（TP）、白蛋白（Alb）、胆红素、低密度脂蛋白胆固醇（LDL-C）、甘油三酯（TG）、尿酸（UA）和淀粉酶的血液样本均正常。高密度脂蛋白胆固醇（HDL-C）水平从65毫克/分升升至89毫克/分升。
血糖水平降低（<50毫克/分升），表明存在低血糖。镁、乳酸脱氢酶（LD）和肌酸激酶（CK）水平升高表明训练强度大。无机磷从3.7毫克/分升升至8.2毫克/分升，提示存在乳酸酸中毒。尿素氮（BUN）水平从16毫克/分升升至53毫克/分升，肌酐从1.1毫克/分升升至1.8毫克/分升，可能归因于高蛋白饮食。然而，心肌酶（CK-MB）未升高。
身体成分和血液化学成分的显著变化表明应确保充足的营养，并注意在赛前饮食和训练期间避免对身体造成过度的生理压力。
