To accurately determine the body fat percentage even during the period of the hot water supply operation.
The system is provided with a flow rate sensor 32 for detecting the flow rate when the hot water is supplied to a bathtub from a hot water supplying device 3, a water level acquisition part 100 which acquires the water level prior to bathing before a bathing person enters into the bathtub and the water level after bathing from the water level sensor 2, a flow rate integration part 301 which determines the amount of the hot water increased in the bathtub by integrating the flow rate until the acquisition of the post-bathing water level after the acquisition of the pre-bathing water level, a volume calculation part 101 which calculates the volume of the bathing person based on the pre-bathing water level and the post-bathing water level, a volume correction part 102 which determines the true volume of the bathing person by subtracting the amount of increased hot water from the volume of the bathing person, a body fat percentage calculating part 103 which calculates the body fat percentage based on the true volume of the bathing person and a display part 42 for displaying the body fat percentage.
YAMAGAMI KAORU
NISHIJIMA SHUICHI
Tatsuya Tanaka
Yoshikazu Fukumoto
Tsukasa Senba
Takashi Shiotani
Hiroshi Furusawa
Masato Tsutsui