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(Chest. 2004;126:1204-1214.)
© 2004 American College of Chest Physicians

Strength vs Aerobic Training in Children With Cystic Fibrosis*

A Randomized Controlled Trial

David M. Orenstein, MD; Melbourne F. Hovell, PhD, MPH; Mary Mulvihill, PhD; Kristen K. Keating, PhD; C. Richard Hofstetter, PhD; Sheryl Kelsey, PhD; Kimberly Morris, PhD and Patricia A. Nixon, PhD

* From Children’s Hospital of Pittsburgh (Drs. Orenstein and Morris), Pittsburgh, PA; San Diego State University (Drs. Hovell, Mulvihill, Keating, and Hofstetter), San Diego, CA; University of Pittsburgh (Dr. Kelsey), Pittsburgh, PA; and Wake Forest University (Dr. Nixon), Winston-Salem, NC.

Correspondence to: Melbourne F. Hovell, PhD, MPH, Center for Behavioral Epidemiology and Community Health, 9245 Sky Park Court, Suite 230, San Diego, CA, 92123.

Study objective: Exercise has the potential to improve the ability of a patient with cystic fibrosis (CF) to cope with the physical demands of everyday life, and may improve prognosis. The purpose of this study was to compare the effects of a home-based, semi-supervised, upper-body strength-training regimen with a similarly structured aerobic training regimen.

Design: Data were collected during a 1-year randomized clinical trial.

Setting: Counselors conducted in-home visits with the participants once per week for the first 8 weeks followed by monthly visits for the remainder of the study.

Patients: Sixty-seven patients with CF, aged 8 to 18 years, participated in the trial.

Intervention: Participants in both exercise conditions were encouraged to exercise at least three times per week for 1 year. Each child in the aerobic group was given a stair-stepping machine, and each child in the upper-body strength training group was given an upper-body-only weight-resistance machine.

Measures and results: Aerobic fitness, pulmonary function, quality of life, and strength were measured at baseline, at 6 months, and at 12 months. Strength training increased the maximum weight lifted for biceps curls significantly more than aerobic training (p < 0.02). However, this differential did not remain significant after control for increase in height. Both training procedures were associated with increased strength (p < 0.002) and physical work capacity (PWC) [p < 0.033].

Conclusions: We concluded that strength and aerobic training may increase upper-body strength, and that both types of training may increase PWC for children with CF. Future trials should be conducted with no-training control subjects and larger samples to increase statistical power.

Key Words: aerobic fitness • cystic fibrosis • exercise • muscle strength






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