A health management system comprises a photo - electronic sensing unit, a memory unit, and a processing unit. The photo - electronic sensing unit is used to sense a physiological signal and output a photo - electronically physiological signal. The memory unit is used to store the photo - electronically physiological signal. The processing unit is used to calculate an active intensity according to the photo - electronically physiological signal, determine whether the active intensity is larger than a threshold or not, and calculate a dynamic energy consumption according to a user weight, an exercising time, and the active intensity when the active intensity is larger than the threshold. The invention further provides a health management method using the health management system comprises sensing a physiological signal to output a photo - electronically physiological signal, calculating an active intensity according to the photo - electronically physiological signal, determining whether the active intensity is larger than a threshold or not, and calculating a dynamic energy consumption according to a user weight, an exercising time, and the active intensity when the active intensity is larger than the threshold.一種健康管理系統,包括光電式感測單元、記憶單元及處理單元。光電式感測單元係用以感測生理訊號,以輸出光電式生理訊號。記憶單元係用以儲存光電式生理訊號。處理單元係用以根據光電式生理訊號計算活動強度,判斷活動強度是否大於第一臨限值,當活動強度大於第一臨限值,根據使用者體重、運動時間及活動強度計算動態能量消耗值。本發明還提供使用健康管理系統之健康管理方法,包括感測生理訊號以輸出光電式生理訊號,根據光電式生理訊號計算活動強度,判斷活動強度是否大於臨限值,當活動強度大於臨限值時,計算動態能量消耗值。301、302、303、304、305、306、307...步驟
