The purpose of this study is to explore an aerobic walking program on memory, subjective cognitive complaints, and brain-derived neurotrophic factor. In quantitative study with experimental design, qualified subjects will be randomly assigned to experimental or control group. Experimental subjects will perform six-month aerobic walking program and control group receive routine care. The outcome measurements included memory, subjective cognitive complaints, and brain-derived neurotrophic factor. Data will be collected at baseline, the end of the six-month intervention. Data will be analyzed using Generalized Estimation Equation evaluate the effect of the intervention program.
