Resistance Training and Diet in Patients With Chronic Renal Failure

This study will examine the effects of long-term adherence to a low protein diet (LPD) of 0.6 g/kg-1/d-1 with and without progressive resistance exercise training in patients with impaired renal function on body composition, renal function (glomerular filtration rate), nitrogen balance, muscle strength and size, and functional capacity. The hypothesis is that adherence to a LPD will result in a reduction in skeletal muscle mass and reduced strength and functional capacity while those patients who adhere to the LPD and exercise will demonstrate a similar preservation of renal function but will have greater fat free mass, muscle mass and strength. The intervention trial will last 18 months in which patients with moderate renal failure will be randomly assigned to one of 4 interventions: standard care, standard care + exercise, LPD, and LPD with exercise. In this way the independent and combined effects of diet and exercise on the progression of renal disease and body composition will be monitored. This study will have important implications for the treatment of patients with chronic renal failure. New strategies of combining exercise with recommendations of a low protein diet may slow the progression of renal disease and improve strength and functional capacity in these at-risk patients.

Study Overview

• Status: Completed
• Conditions: Kidney Failure, Chronic
• Intervention / Treatment: Behavioral: resistance training; Behavioral: low protein diet; Behavioral: combination of diet control and exercise

Detailed Description

Management of dietary protein intake of the CRF patient represents a critical balance between providing adequate protein to meet nutritional requirements, and limiting protein intake in the hope of slowing or abating the progression of CRF. A number of studies have demonstrated that reduced dietary protein intake can slow the progression of chronic renal failure. Finding effective ways to increase nitrogen retention and decrease urinary nitrogen excretion may help CRF patients maintain a more positive nitrogen balance and lessen the nitrogen load on the kidneys for a given dietary protein intake. Our laboratory has demonstrated that in older men and women, the consequence of adherence to a low protein diet is an accommodation that results in decreased muscle mass, strength,and compromised immune function. We have also demonstrated that when healthy, free living older men and women consume a weight maintenance diet providing the RDA for protein of 0.8 g/kg-1/day-1 for 15 weeks they lose skeletal muscle mass. These data clearly indicate that elderly people have an increased need for dietary protein (compared to young people). Data has also demonstrated that progressive resistance exercise improves nitrogen balance in older healthy individuals as well as in patients with mild to moderate chronic renal failure.

• Study Type: Interventional
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • Arkansas
    • Little Rock, Arkansas, United States, 72205
      • Central Arkansas Veterans Healthcare System

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 50 years to 89 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

• Men and women 50-89 years with chronic renal failure (defined as creatinine clearance of 25-65).
• Volunteers must be able to fulfill the requirements associated with this protocol.
• Volunteers may be hypertensive and/or diabetic.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Masking: None (Open Label)

Collaborators and Investigators

• Sponsor: US Department of Veterans Affairs
• Investigators: Dinesh Chatoth, M.D.

Study record dates

Study Major Dates

• Study Start: October 1, 2000
• Study Completion: December 1, 2005

Study Registration Dates

• First Submitted: July 3, 2001
• First Submitted That Met QC Criteria: July 4, 2001
• First Posted (Estimate): July 5, 2001

Study Record Updates

• Last Update Posted (Estimate): January 21, 2009
• Last Update Submitted That Met QC Criteria: January 20, 2009
• Last Verified: December 1, 2004

More Information

Terms related to this study

• Keywords: exercise; Diet
• Additional Relevant MeSH Terms: Kidney Diseases; Urologic Diseases; Renal Insufficiency, Chronic; Kidney Failure, Chronic; Renal Insufficiency
• Other Study ID Numbers: AGCG-005-99F