Abstract
The acute impact of cardiovascular exercise on implicit motor learning of stroke survivors is still unknown. We investigated the effects of cardiovascular exercise on implicit motor learning of mild-moderately impaired chronic stroke survivors and neurotypical adults. We addressed whether exercise priming effects are time-dependent (e.g., exercise before or after practice) in the encoding (acquisition) and recall (retention) phases. Forty-five stroke survivors and 45 age-matched neurotypical adults were randomized into three sub-groups: BEFORE (exercise, then motor practice), AFTER (motor practice, then exercise), and No-EX (motor practice alone). All sub-groups practiced a serial reaction time task (five repeated and two pseudorandom sequences per day) on three consecutive days, followed 7 days later by a retention test (one repeated sequence). Exercise was performed on a stationary bike, (one 20-min bout per day) at 50% to 70% heart rate reserve. Implicit motor learning was measured as a difference score (repeated—pseudorandom sequence response time) during practice (acquisition) and recall (delayed retention). Separate analyses were performed on the stroke and neurotypical groups using linear mixed-effects models (participant ID was a random effect). There was no exercise-induced benefit on implicit motor learning for any sub-group. However, exercise performed before practice impaired encoding in neurotypical adults and attenuated retention performance of stroke survivors. There is no benefit to implicit motor learning of moderately intense cardiovascular exercise for stroke survivors or age-matched neurotypical adults, regardless of timing. Practice under a high arousal state and exercise-induced fatigue may have attenuated offline learning in stroke survivors.
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Data are available at the link: https://figshare.com/articles/dataset/Raw_data_-_Implicit_learning_x_exercise_x_stroke/20043695. The motor task code can be verified in the following link: https://github.com/bastosfh/SRT_psychtoolbox.
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GMGB—conceptualization, methodology, data curation, formal analysis, investigation, writing–original draft, editing, project administration. FHB—data curation, formal analysis, motor task code and creation, investigation. NS—formal analysis, investigation. EW—formal analysis, Investigation. CJW—conceptualization, methodology, writing–review and editing, investigation. CTP—conceptualization, methodology, writing–review and editing, investigation, supervision.
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Bonuzzi, G.M.G., Bastos, F.H., Schweighofer, N. et al. Moderate-intensity cardiovascular exercise performed before motor practice attenuates offline implicit motor learning in stroke survivors but not age-matched neurotypical adults. Exp Brain Res 241, 2019–2032 (2023). https://doi.org/10.1007/s00221-023-06659-w
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DOI: https://doi.org/10.1007/s00221-023-06659-w