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Short-term interval aerobic exercise training does not improve memory functioning in relapsing-remitting multiple sclerosis -- a randomized controlled trial
Baquet L, Hasselmann H, Patra S, Stellmann JP, Vettorazzi E, Engel AK, Rosenkranz SC, Poettgen J, Gold SM, Schulz KH, Heesen C
PeerJ 2018 Dec 12;6:e6037
clinical trial
8/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: Yes; Intention-to-treat analysis: Yes; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

BACKGROUND: Only few aerobic exercise intervention trials specifically targeting cognitive functioning have been performed in multiple sclerosis. OBJECTIVE AND METHODS: This randomized controlled trial with 34 patients in the intervention group (IG) (mean 38.2 years (+/- 9.6)) and 34 patients in the control group (CG) (mean 39.6 years (+/- 9.7)) aimed to determine the effects of aerobic exercise on cognition in relapsing-remitting multiple sclerosis (RRMS). The primary outcome was verbal learning assessed by the verbal learning and memory test (VLMT). Patients were randomized to an IG or a waitlist CG. Patients in the IG exercised according to an individually tailored training schedule (with two to three sessions per week for 12 weeks). The primary analysis was carried out using the intention-to-treat (ITT) sample with ANCOVA adjusting for baseline scores. RESULTS: A total of 77 patients with RRMS were screened and 68 participants randomized (CG n = 34; IG n = 34). The sample comprised 68% females, had a mean age of 39 years, a mean disease duration of 6.3 years, and a mean expanded disability status scale of 1.8. No significant effects were detected in the ITT analysis for the primary endpoint VLMT or any other cognitive measures. Moreover, no significant treatment effects were observed for quality of life, fatigue, or depressive symptoms. CONCLUSION: This study failed to demonstrate beneficial effects of aerobic exercise on cognition in RRMS. The trial was prospectively registered at (NCT02005237).

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