The ActiGraph accelerometer is one of the most widely used motion sensor detectors in research. However, its applicability in Japanese has not been fully clarified. Therefore, the purpose of this study was to investigate the validity of equations for estimating physical activity intensity by the ActiGraph in Japanese. The subjects wore the ActiGraph wGT3X-BT on their waist and wrist during walking, running, and activities of daily living to assess the intensity of their physical activities. The results suggest that when worn on the waist, the ActiGraph provided the best estimation when used with Crouter’s equation. When worn on the wrist, it could not accurately estimate the intensities of the subjects’ physical activities.
