Superior Effects of High-Intensity Interval Training Compared to Conventional Therapy on Cardiovascular and Psychological Aspects in Myocardial Infarction.

OBJECTIVE: To evaluate the effect of high-intensity interval training (HIIT) on psychological symptoms, activity states, and cardiovascular functions in patients with myocardial infarction (MI) of low and moderate risk stratification. METHODS: This prospective study randomly allocated 44 patients with MI to 18 sessions of HIIT or conventional moderate-intensity continuous training (MICT). Outcome measures were assessed at baseline and after 18 sessions. RESULTS: Post-exercise cardiovascular and functional states, maximal oxygen uptake (VO2max), metabolic equivalents (METs), 6-Minute Walking Test (6MWT), and Korean Activity Scale/Index (KASI) scores were significantly improved in the HIIT group compared to those in the MICT group after 18 exercise sessions. In particular, VO2max was significantly (p<0.005) improved in the HIIT group (7.58 mL/kg/min) compared to that in the MICT group (2.42 mL/kg/min). In addition, post-exercise psychological states (i.e., scores of Fatigue Severity Scale [FSS] and depression items of the Hospital Anxiety and Depression Scale [HADS_D]) were significantly improved in the HIIT group compared to those in the MICT group after 18 exercise sessions. HADS-D was improved by 1.89 in the HIIT group compared to decrement of 0.47 in the MICT group. FSS was improved by 6.38 in the HIIT group compared to decrement of 0.77 in the MICT group (p<0.005). CONCLUSION: This study demonstrates that HIIT can improve cardiac function, psychological, and activity states in low and moderate risk MI patients. Compared to conventional MICT, HIIT can improve cardiovascular functions, activity states, depression, and fatigue more effectively.

The associations between insomnia and health-related quality of life in rehabilitation units at 1month after stroke.

OBJECTIVE: The principal objective of this study was to investigate the relationship between insomnia and health-related quality of life (HRQoL) during the early stage of stroke rehabilitation. METHODS: The subjects were 214 first-time stroke patients admitted to a rehabilitation unit at one of three Korean hospitals. Within 7days after stroke, functions were evaluated using; the Berg Balance Scale, the Modified Barthel Index, the Mini Mental State Examination, the Frontal Assessment Battery, Screening Tests for Aphasia and Neurologic-Communication Disorders, and the National Institute of Health Stroke Scale. Insomnia, depression, anxiety, and HRQoL were investigated at one month after stroke. Insomnia was defined as presence of at least one of the four following; difficulty initiating sleep, difficulty maintaining sleep, early morning awakening, and non-restorative sleep. HRQoL was assessed using the Short Form Health survey SF-8. Depression and anxiety were measured using the Hospital Anxiety Depression Scale. Multivariate linear regression analysis was conducted to examine the association between insomnia and HRQoL. RESULTS: The prevalence of insomnia at one month after stroke was 59.5%. Patients with insomnia were more likely to be older and female and to have depression and anxiety. Patients with insomnia had poorer physical and mental HRQoL. By multivariate analyses, physical HRQoL was significantly associated with type of stroke, hypnotic usage, balancing function, and insomnia. Mental HRQoL was significantly associated with balancing function, depression, and insomnia. CONCLUSION: Insomnia was found to be negatively associated with physical and mental HRQoL in stroke patients during the early stage of rehabilitation.

The Effect of Sleep Disturbances on the Functional Recovery of Rehabilitation Inpatients Following Mild and Moderate Stroke.

OBJECTIVE: The aim of the study was to explore the impact of insomnia and sleep disturbance on the functional outcomes of mild and moderated stroke. DESIGN: A multicenter-observational and correlation study was performed. Two hundred eighty patients with mild-moderate severity stroke admitted to three acute hospitals rehabilitation departments. Diagnostic Statistical Manual of Mental Disorders, Fourth Edition, criteria were used to define patients with insomnia and any sleep disturbance. Patient's initial and final functions were evaluated using the Korean version of the Berg Balance Scale, the Korean version of Modified Barthel Index, the Korean version of Mini-Mental State Examination, the Korean version of the Frontal Assessment Battery, and the Korean version of National Institute of Health Stroke Scale. Sleep disturbance and function were assessed with respect to stroke severity as defined by the Korean version of National Institute of Health Stroke Scale. RESULTS: The prevalence of Diagnostic Statistical Manual of Mental Disorders, Fourth Edition insomnia and any sleep disturbance were 26.9% and 56.7%, respectively. After adjusting for age, sex, depression, anxiety, length of stay, and hypnotic usage, the improvement of Korean version of the Berg Balance Scale was significantly lower in the any sleep disturbance group. In the moderate stroke group, the Korean version of the Berg Balance Scale improvement was significantly lower in the any sleep disturbance group, whereas in the mild stroke group, the Korean version of the Berg Balance Scale improvement was not significant. CONCLUSIONS: Sleep disturbance after stroke was found to have negative effects on functional recovery, especially balance improvement in moderate stroke group.