Assisted 6-minute cycling test: An exploratory study in children

Ilse Dirks, Saskia Koene, Renee Verbruggen, Jan A M Smeitink, Merel Jansen, Imelda J M De Groot
Muscle & Nerve 2016, 54 (2): 232-8

INTRODUCTION: The 6-minute walk test (6MWT) is frequently used as an outcome measure for clinical trials in neuromuscular disease. Because this submaximal endurance test is not feasible for nonambulatory patients, the motor-assisted 6-minute cycling test (A6MCT) was developed.

METHODS: Nineteen children with neuromuscular disorders and children with OXPHOS-dysfunction performed the a6MCT and the 6MWT to explore feasibility and construct validity. Test-retest reproducibility was evaluated within 3 weeks.

RESULTS: The assisted 6-minute cycling test was feasible in 90% and 78% of the patients with a neuromuscular disorder and OXPHOS-dysfunction, respectively. The A6MCT for legs correlated with the 6MWT in both patient groups. The assisted 6-minute cycling showed good reproducibility for both legs and arms.

CONCLUSIONS: This exploratory study indicates that the assisted 6-minute cycling test is a promising outcome measure for patients with a neuromuscular disorder and patients with OXPHOS-dysfunction. Muscle Nerve, 2015. Muscle Nerve 54: 232-238, 2016.

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