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The Journal of Sports Medicine and Physical Fitness 1998 September;38(3):245-52

Copyright © 1999 EDIZIONI MINERVA MEDICA

lingua: Inglese

Effect of a precompetition bodybuilding diet and training regimen on body composition and blood chemistry

Too D. 1, Wakayama E. J. 2, Locati L. L. 3, Landwer G. E. 4

1 Department of Physical Education and Sport, State University New York, Brockport; 2 Clinical Laboratory Science Program, University of Nevada Las Vegas; 3 Department of Kinesiology, University of Nevada Las Vegas; 4 Department of Physical Education, University of Nevada Las Vegas


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Objec­tive. 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.
Par­tic­i­pant. One ­adult ­male, ­steroid and ­drug ­free, pre­paring for a ­first com­pe­ti­tion.
Meas­ures. ­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.
­Results. ­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.
Con­clu­sions. 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.

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