title: An isoenergetic high-protein, moderate-fat diet does not compromise strength and fatigue during resistance exercise in women.
abstract: Resistance exercise is recommended to individuals following high-protein diets in order to augment changes in body composition. However, alterations in macronutrient composition may compromise physical performance. The present study investigated the effects of an isoenergetic high-protein diet on upper and lower limb strength and fatigue during high-intensity resistance exercise. Ten recreationally active women, aged 25-40 years, followed a control diet (55, 15 and 30 % of energy from carbohydrate, protein and fat, respectively) and a high-protein diet (respective values, 30, 40 and 30) for 7 d each in a random counterbalanced design. Each participant underwent strength testing of upper limb (isometric handgrip strength and endurance) and lower limb (four sets of sixteen maximal knee flexions and extensions on an isokinetic dynamometer) before and after applying each diet. Body weight, body fat and RER were significantly reduced following the high-protein diet (P < 0.05). No differences were found between diets in any of the strength performance parameters (handgrip strength, handgrip endurance, peak torque, total work and fatigue) or the responses of heart rate, systolic and diastolic arterial pressure, blood lactate and blood glucose to exercise. Women on a short-term isoenergetic high-protein, moderate-fat diet maintained muscular strength and endurance of upper and lower limbs during high-intensity resistance exercise without experiencing fatigue earlier compared with a control diet.
authors.affiliation: Department of Physical Education and Sport Science at Serres, Aristotelio University of Thessaloniki, Greece. kdipla@phed-sr.auth.gr
authors.forename: Konstantina
authors.initials: K
authors.lastname: Dipla
authors.forename: Maria
authors.initials: M
authors.lastname: Makri
authors.forename: Andreas
authors.initials: A
authors.lastname: Zafeiridis
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Soulas
authors.forename: Sofia
authors.initials: S
authors.lastname: Tsalouhidou
authors.forename: Vassilis
authors.initials: V
authors.lastname: Mougios
authors.forename: Spyros
authors.initials: S
authors.lastname: Kellis
mesh_terms: D000328:Adult; D004032:Diet; D004041:Dietary Fats / Q000008:administration & dosage*; D004044:Dietary Proteins / Q000008:administration & dosage*; D002149:Energy Intake / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D005260:Female; D018737:Hand Strength / Q000502:physiology; D006801:Humans; D035002:Lower Extremity / Q000502:physiology; D018763:Muscle Fatigue / Q000502:physiology*; D053580:Muscle Strength / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology; D034941:Upper Extremity / Q000502:physiology; D015431:Weight Loss / Q000502:physiology
chemical_list: D004041:Dietary Fats; D004044:Dietary Proteins