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Low Carbohydrate and Conventional Diets Associated to Resistance Training on Muscle Fitness and Health Markers (LCD-RT)

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ClinicalTrials.gov Identifier: NCT01096836
Recruitment Status : Completed
First Posted : March 31, 2010
Last Update Posted : March 31, 2010
Sponsor:
Information provided by:
Universidade Gama Filho

Brief Summary:
The purpose of this study was to compare the effects of two different diets (low carbohydrate - LCD and conventional - CONV) on body composition, strength performance, muscle mass and biomarkers of health in overweight adults submitted to resistance training (RT). It has been hypothesized that LCD would produce higher rates of weight loss and that both diets would be useful to maintain muscle mass and strength and biomarkers of health.

Condition or disease Intervention/treatment Phase
Obesity Overweight Other: macronutrient and energy manipulation Not Applicable

Detailed Description:
Overweight and obesity prevalence has increased worldwide. Current guidelines recommend health behavior modifications, including better eating habits and regular physical activity (including resistance training - RT) as a strategy to control and prevent the problem. Traditionally, diets poor in energy and fat (conventional diets - CONV) have been recommended to promote losses in body and fat masses; however, there has been recently a growing interest in the academic community to investigate the effects of low carbohydrate diet (LCD) on health outcomes, since this kind of diet appears to be more effective for reducing body mass as compared to CONV. Nevertheless, evidences are scarce regarding the effects of LCD associated to RT on body composition, strength performance, blood lipids, endothelium function and other markers of health, demanding the development of clinical trials aiming to determine the combined health effects of these interventions.

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 21 participants
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Combined Effects of Resistance Training and Low Carbohydrate or Conventional Diets on Strength, Muscle Mass, Body Composition, Blood Lipids and Endothelium Function
Study Start Date : September 2006
Actual Primary Completion Date : January 2008
Actual Study Completion Date : August 2008

Arm Intervention/treatment
Experimental: Diet counseling
Outcomes of the study may enhance diet counseling
Other: macronutrient and energy manipulation
Experimental: exercise training Other: macronutrient and energy manipulation



Primary Outcome Measures :
  1. body mass [ Time Frame: eight weeks ]
    Measured always at the same time of the day on a calibrated weight scale


Secondary Outcome Measures :
  1. Muscle strength [ Time Frame: eight weeks ]
    Measured using resistance exercise machines (isotonic) in four exercise movements

  2. Endothelial function [ Time Frame: eight weeks ]
    Measured using a two dimensional color spectral Doppler ultrasound equipped with a 14MHz linear transducer. Subject laid down comfortably in the supine position with the right arm slightly abduced. After locating the brachial artery, the transducer was placed on the anteromedial face of the right arm, perpendicular to the centerline of the arm, 5-10 cm above the antecubital fossa, over the artery.

  3. muscle thicknesses [ Time Frame: eight weeks ]
    Measured with a ultrasoundo bidimensional in Mode B, with a 7,5MHz transducer on the anatomical sites knee extensor muscles and elbow flexors and extensors.

  4. markers of renal function [ Time Frame: eight weeks ]
    Measured using conventional and satandardized laboratory methods with subjects fasting for 12 hours

  5. body composition [ Time Frame: eight weeks ]
    Measured with skinfold calipers and using prediction equations to determine body fat and lean body mass.



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Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • BMI equal or over 25 kg/m2
  • resistance trained at least 12 weeks

Exclusion Criteria:

  • upper or lower limbs injury
  • pregnancy
  • diabetes
  • use of ergogenics, stimulants or drugs
  • history of dislipidemias
  • arterial hypertension

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01096836


Locations
Brazil
Laboratory Crossbridges
Rio de Janeiro, RJ, Brazil, 20748-900
Sponsors and Collaborators
Universidade Gama Filho
Investigators
Principal Investigator: Paulo Sergio C Gomes, Ph.D. Universidade Gama Filho

Responsible Party: Prof. Paulo Sergio Chagas Gomes, Ph.D., Universidade Gama Filho
ClinicalTrials.gov Identifier: NCT01096836     History of Changes
Other Study ID Numbers: UGF-01-2010
First Posted: March 31, 2010    Key Record Dates
Last Update Posted: March 31, 2010
Last Verified: November 2007

Keywords provided by Universidade Gama Filho:
resistance exercise
body mass index
hypertrophy
endothelial function
blood lipids

Additional relevant MeSH terms:
Overweight
Body Weight
Signs and Symptoms