Clinical trial NCT02664519: Mechanisms of Muscle Blood Flow Dysregulation and Exercise Intolerance in Chronic Kidney Disease
Official title: Mechanisms of Muscle Blood Flow Dysregulation and Exercise Intolerance in Chronic Kidney Disease
Study type: INTERVENTIONAL
Overall status: TERMINATED
Phase: NA
Conditions: Chronic Kidney Disease
Keywords: Chronic Kidney Disease
Functional sympatholysis
Exercise training
Exercise intolerance
Handgrip exercise
Near infrared spectroscopy
Lower body negative pressure
Lead sponsor: University of Texas Southwestern Medical Center
Sponsor class: OTHER
First posted: 2016-01-27
Enrollment: 32
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: CROSSOVER
Primary purpose: PREVENTION

Brief summary: Patients with chronic kidney disease (CKD) experience fatigue and exercise intolerance. Increased oxidative stress in CKD may be a contributing factor. The role of impaired muscle blood flow regulation has not been fully explored. The investigators hypothesize that functional sympatholysis is exaggerated in CKD and this is associated with increased oxidative stress. The investigators also hypothesize that exercise training will improve functional sympatholysis and oxidative stress

Detailed description: Progressive muscle weakness and premature fatigue are characterize the condition of chronic kidney disease (CKD) which can be very debilitating. Mechanisms underlying exercise intolerance in CKD is not completely understood. Previous studies have demonstrated impaired skeletal muscle vasodilation during exercise in CKD patients, which may contribute to exercise intolerance. Normally, there is blunting of sympathetic mediated vasoconstriction in exercising muscle to allow for steady blood supply to exercising muscles. This phenomenon is called functional sympatholysis. Functional sympatholysis is impaired by increases in reactive oxygen specie and may be impaired in CKD.

Experiments will be performed on 2 groups of subjects 1) Normal kidney function (eGFR\>90) 2) Stage 2-3 CKD (eGFR 30-89). VAsoactive medications will be held for 72 hours before study. All participants will attend a baseline study visit, which will include a physical examination, a medical history review, vital sign measurements, and blood collection. Muscle nerve activity and muscle oxygenation will be measured while the subjects perform hand grip exercise at 30% maximum voluntary contraction with and without lower body negative pressure (- 20 mmHg). Muscle blood flow will be measured before and after hand grip exercises. CKD subjects will then be randomized to exercise training (to squeeze a tennis ball repeatedly for at least 30 min/day) or no exercise training for 28 days. Procedures in baseline visit will be repeated followed by cross over to alternate group for 28 days followed by repeat of baseline procedures. Blood flow, muscle oxygenation and muscle nerve activity will be compared between CKD and normal subjects as well as before and after exercise training for CKD subjects.

Eligibility criteria: Inclusion Criteria:

* Normotensive adults
* CKD 2-3

Exclusion Criteria:

* Blood Pressure ≥140/90
* eGFR \>60ml/min/1.73 m2 or eGFR \<30ml/min/1.73 m2
* Any evidence of cardiopulmonary disease, left ventricular hypertrophy or systolic dysfunction by echocardiography.
* Diabetes mellitus or other systemic illness
* Pregnancy
* Any history of substance abuse or current cigarette use
* Any history of psychiatric illness
* History of malignancy

Primary outcomes:
measure: Change in muscle oxygenation
timeFrame: After 28 days
Secondary outcomes:
measure: Change in Forearm vascular conductance (FVC)
timeFrame: After 28 days
measure: Change in plasma isoprostanes
timeFrame: After 28 days
measure: Change in muscle sympathetic nerve activity (MSNA)
timeFrame: After 28 days
Other outcomes:
Locations:
city: Dallas
country: United States
facility: University of Texas Southwestern Medical Center at Dallas
state: Texas
Study officials:
affiliation: UT Southwestern Medical Center
name: Wanpen Vongpatanasin, MD
role: PRINCIPAL_INVESTIGATOR
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