Limitation of the study
cognitive complaints, depressive symptoms
First, this study was not originally designed to investigate the relationship between TL and subjective depressive symptoms and cognitive complaints in the elderly. Second, since this study was a feasibility RCT, it will be necessary to confirm the results of our study by performing large-scale RCT in the future. Third, the period between the two TL measurements was relatively short. Therefore, long-term changes in TL could not be analyzed. Fourth, the relatively small sample size in the present study may have influenced the results.