|其他题名||Fffectc of trance nn Memorv and Hippocamnus in Older Adults|
|关键词||运动 舞蹈 记忆 海马 认知老化|
Episodic memory decline caused by the deterioration of hippocampus is one of the most typical manifestations of cognitive aging. Maintaining and promoting memory function as well as delaying hippocampal deterioration is important for improving the quality of life of the elderly. Although different levels of evidence provides supporting evidence for the positive links among aerobic exercise, cognitive function, and aging brains, it is controversial whether aerobic exercise can improve memory function and hippocampal volume. Moreover, it is unclear how aerobic exercise affects the volumes of hippocampal subregions and hippocampal function.
Dance is a multi-component aerobic exercise integrating physical exercise, cognition, and social stimulation. Evidence shows that dance induces cognitive benefits for older adults, but it is still unclear about the impacts of dance on memory and brain structure and function. The "multi-component" characteristics of dance may make it advantageous in both cognitive enhancement and intervention implementation.
The present study investigated the effects of dance on episodic memory and hippocampus by using cross-sectional and interventional data. Study 1 used cross-sectional data to examine the relationship between long-term dance experience and memory function, finding that dancers had better memory performance and fewer memory complaints. The association between dance and memory was independent of demographical factors and leisure activities, and the relationship was dose-responding,that is, longer dance years was associated with better memory performance. Study 2 was a meta-analysis that examined whether short-term dance training improved memory function in elderly. The results showed that dance training improved memory function compared with controls, while no difference was found between dance and other interventions. Dance showed differential effects on different types of memory.
Dance enhanced verbal memory but not visual memory; dance improved performance on immediate and delayed recall but not recognition. Study 3 investigated the impacts of dance on memory function, hippocampal volume, and resting-state function by conducting a four-month dance randomized controlled trial. Improvement in aerobic fitness was only observed in dance group but not the stretching group (active control), and both dance and stretching groups demonstrated greater physical activity levels.Compared with passive controls, both dance and stretching groups showed increased performance on verbal and visual delayed memory. Memory improvements were correlated with changes in aerobic fitness and physical activity. Dance group had reduced grey matter volume in right parahippocampus and increased white matter volume in right hippocampus. Compared to the stretching group, dance group showed increased functional connectivity between parahippocampus/hippocampus and occipital and frontal lobes and decreased parahippocampal connectivity with the parietal lobe. The improvement in parahippocampus-fusiform gyrus connectivity positively correlated with memory improvement.
The results suggest the plasticity of memory and hippocampus in elderly. Dance benefits the maintaining and promoting of memory function, and the beneficial effect is related to dance-related impact on hippocampal function.
|朱心怡. 舞蹈对老年人记忆和海马的影响[D]. 北京. 中国科学院研究生院,2018.|