Fiber type specific response of skeletal muscle satellite cells to high-intensity resistance training in dialysis patients

TY - JOUR

T1 - Fiber type specific response of skeletal muscle satellite cells to high-intensity resistance training in dialysis patients

AU - Molsted, Stig

AU - Andersen, Jesper Løvind

AU - Harrison, Adrian Paul

AU - Eidemak, Inge

AU - Mackey, Abigail

N1 - Copyright © 2015 Wiley Periodicals, Inc., a Wiley company.

PY - 2015/11

Y1 - 2015/11

N2 - Introduction: The aim of this study was to assess the effect of high-intensity resistance training on satellite cell (SC) and myonuclear number in the muscle of patients undergoing dialysis. Methods: Patients (n=21) underwent a 16-week control period, followed by 16 weeks of resistance training 3 times weekly. SC and myonuclear number were determined by immunohistochemistry of vastus lateralis muscle biopsy cross-sections. Knee extension torque was tested in a dynamometer. Results: During training, SCs/type I fibers increased by 15%, whereas SCs/type II fibers remained unchanged. Myonuclear content of type II, but not type I, fibers increased with training. Before the control period, the SC content of type II fibers was lower than that of type I fibers, whereas contents were comparable when normalized to fiber area. Torque increased after training. Conclusions: Increased myonuclear content of type II muscle fibers of dialysis patients who perform resistance training suggests that SC dysfunction is not the limiting factor for muscle growth.

AB - Introduction: The aim of this study was to assess the effect of high-intensity resistance training on satellite cell (SC) and myonuclear number in the muscle of patients undergoing dialysis. Methods: Patients (n=21) underwent a 16-week control period, followed by 16 weeks of resistance training 3 times weekly. SC and myonuclear number were determined by immunohistochemistry of vastus lateralis muscle biopsy cross-sections. Knee extension torque was tested in a dynamometer. Results: During training, SCs/type I fibers increased by 15%, whereas SCs/type II fibers remained unchanged. Myonuclear content of type II, but not type I, fibers increased with training. Before the control period, the SC content of type II fibers was lower than that of type I fibers, whereas contents were comparable when normalized to fiber area. Torque increased after training. Conclusions: Increased myonuclear content of type II muscle fibers of dialysis patients who perform resistance training suggests that SC dysfunction is not the limiting factor for muscle growth.

U2 - 10.1002/mus.24633

DO - 10.1002/mus.24633

M3 - Journal article

C2 - 25736589

SN - 0148-639X

VL - 52

SP - 736

EP - 745

JO - Muscle & Nerve

JF - Muscle & Nerve

IS - 5

ER -