RESUMO
BACKGROUND: Over half of stroke survivors have cognitive impairment, which impedes rehabilitation and functional recovery. Evidence suggests a single session of aerobic exercise improves cognitive functions among healthy adults. Whether this holds true for stroke survivors is unclear. The objective of this study was to examine whether one session of moderate-intensity aerobic exercise improves the cognitive control and attention of stroke survivors. METHODS: Nine people with chronic stroke (≥6 months poststroke) performed a modified Eriksen Flanker task with concurrent electroencephalography (EEG) before and immediately, 20 minutes, and 40 minutes after 20 minutes of moderate-intensity exercise and after 20 minutes of rest. The sessions were in randomized order. Accuracy and response time were recorded for congruent and incongruent stimuli. Differences in accuracy, response time, and event-related potentials (P300, reflective of decision making) were analyzed using repeated measures analysis of variance. RESULTS: Improvements in EEG measures were noted after exercise. P300 amplitude at Fz was greater 40 minutes after exercise compared with after rest (P = .007). P300 latency was also shorter at 20 minutes after exercise compared with after rest for both congruent (465.8 milliseconds versus 500.0 milliseconds; P = .02) and incongruent (468.0 milliseconds versus 532.0 milliseconds; P = .003) conditions at the central electrode on the lesional side. Differences in behavioral performance after exercise were not significant. CONCLUSIONS: Preliminary results suggest that aerobic exercise improves cortical processes underlying cognitive control and attention 20-40 minutes postexercise. Future research should confirm results in a larger sample and examine whether attention-demanding rehabilitation in this window has improved outcomes.
Assuntos
Córtex Cerebral/fisiopatologia , Transtornos Cognitivos/terapia , Cognição , Terapia por Exercício/métodos , Acidente Vascular Cerebral/terapia , Idoso , Atenção , Comportamento de Escolha , Doença Crônica , Transtornos Cognitivos/diagnóstico , Transtornos Cognitivos/fisiopatologia , Transtornos Cognitivos/psicologia , Eletroencefalografia , Potenciais Evocados P300 , Teste de Esforço , Terapia por Exercício/efeitos adversos , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Testes Neuropsicológicos , Ontário , Tempo de Reação , Acidente Vascular Cerebral/diagnóstico , Acidente Vascular Cerebral/fisiopatologia , Acidente Vascular Cerebral/psicologia , Fatores de Tempo , Resultado do TratamentoRESUMO
This pilot study examined changes in physical activity and function among older adults moving from community dwellings to retirement living. Twelve community-dwelling older adults, recruited from the wait-lists of two retirement living facilities, were assessed prior to and following the transition to retirement living. Physical activity was assessed using an Actigraph (GT3X+) activity monitor; physical activity by type was reported with the CHAMPS activity questionnaire. Physical function was assessed using the Senior Fitness Test. Objectively monitored total physical activity decreased after the transition to retirement living (p = 0.02). Reports of physical activity by type indicated that only activities of daily living decreased (p < 0.01) although intentional exercise increased (p < 0.03) with the transition. Endurance and strength also improved (p < 0.05 and p < 0.04). Pilot results indicate that possible physical benefits accrue from retirement living, although efforts to reduce sedentary time are needed.