Objective: Immature arteriovenous fistula (AVF) is a critical problem in patients with chronic kidney disease (CKD) after creation. Exercise with 30% maximum voluntary contraction (MVC) encourages vascular functions in other populations. It is unknown which exercise type is superior on maturation in the CKD population. We compare effects of isometric (ISM) and isotonic (IST) hand exercise training, both at 30% MVC, on AVF maturation and grip strength in patients with CKD.
Methods: Fifty patients with CKD were randomized into the ISM program or IST program (25 per group). Each group performed exercise program at intensity of 30% MVC every day for 10 weeks. Cephalic vein (CV) and brachial artery diameters, brachial blood flows, and grip strength were measured at weeks 0, 2, 6, and 10 of the program. The number of patients meeting clinical and ultrasound maturation were evaluated at weeks 2, 6, and 10.
Results: At weeks 6 and 10 of the programs, the ISM group had greater CV diameters (week 6, 7.1 ± 1.2 vs 6.2 ± 1.0 mm; week 10, 7.1 ± 1.0 vs 6.2 ± 1.1 mm) than the IST group. Compared with the IST group, the ISM group had a higher number of patients meeting ultrasound maturation at weeks 2 (IST/ISM, 8/2), 6 (IST/ISM, 16/8), and 10 (IST/ISM, 21/12), and clinical maturation at week 10 (IST/ISM, 25/18). No adverse events were observed throughout the study.
Conclusions: At 30% MVC, ISM is more effective at promoting increases in CV diameter and maturation than IST. Both exercise types are feasible and safe for patients with CKD after AVF creation.
Keywords: Arteriovenous fistula; Exercise; Isometric contraction; Kidney disease; Rehabilitation.
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