Original articles  BODY COMPOSITION, SPORT NUTRITION AND SUPPLEMENTATION 

The Journal of Sports Medicine and Physical Fitness 2002 March;42(1):31-7

Copyright © 2009 EDIZIONI MINERVA MEDICA

lingua: Inglese

A moderate carbohydrate and fat diet does not impair strength performance in moderately trained males

Van Zant R. S., Conway J. M., Seale J. L.

From the Department of Physical Therapy University of Findlay, Findlay, Ohio, USA *US Department of Agriculture, Agricultural Research Service Beltsville Human Nutrition Research Center Diet and Human Performance Laboratory Beltsville, Maryland, USA

Background. The pur­pose of ­this inves­ti­ga­tion was to ­study the ­effects of var­ied lev­els of die­tary car­bo­hy­drate and fat ­intake on exer­cise train­ing and ­high inten­sity exer­cise per­for­mance in mod­er­ate­ly ­strength ­trained, aero­bic ­trained and ­untrained ­males.
Methods. Subjects (6 ­strength ­trained, 6 aero­bi­cal­ly ­trained serv­ing as an ­active con­trol ­group, 6 sed­en­tary) con­sumed iso­en­er­get­ic ­diets con­sid­ered ­either ­high CHO/low fat (HC/LF: ­total ener­gy 62% CHO, 20% fat, 18% pro­tein) or mod­er­ate CHO and fat (MC/MF: ­total ener­gy 42% CHO, 40% fat, 18% pro­tein) in a ran­dom­ly ­assigned cross­over ­design. Each die­tary treat­ment was ­three ­weeks in ­length. Prior to the ­study and fol­low­ing ­each die­tary treat­ment, mus­cu­lar ­strength and endu­rance was deter­mined (iso­ki­net­ic ­knee exten­sion and flex­ion, stan­dard con­cen­tric ­free ­weight ­bench ­press).
Results. No dif­fer­enc­es as a ­result of the die­tary treat­ment ­were ­seen in iso­ki­net­ic ­peak ­torque, ­total ­work pro­duc­tion, sin­gle rep­e­ti­tion max­i­mum (1 RM) ­bench ­press, or num­ber of ­bench ­press rep­e­ti­tions at 80% 1 RM. Self-report­ed exer­cise log ­data ­showed no die­tary ­effect on the ­subject’s abil­ity to main­tain train­ing lev­el.
Conclusions. These find­ings indi­cate ­that var­y­ing die­tary mac­ro­nu­tri­ent con­tent (HC/LF or MC/MF) had no ­effect on exer­cise train­ing or ­stength exer­cise per­for­mance in mod­er­ate­ly ­trained (aero­bic and ­strength) or sed­en­tary ­males.