A method for detecting cardiac status is provided. A users heart rate is measured by a heart rate detection unit, and the users acceleration or activity level is measured by an acceleration detection unit, which the activity level is calculated by the acceleration detection unit. A cardio force index is obtained by a calculating unit based on the heart rate, and the acceleration, or the weight as the following formula (Ia) or (Ib):CFI=(Weight×)Acceleration/Heart Rate (Ia)CFI=(Weight×)Activity Level/Heart Rate (Ib)The cardio force ratio is a ratio of the user as the following formula (II):Cardio Force Ratio=CFI of Exercise/CFI of Walking (II)A method for monitoring cardiac status during exercise and an apparatus for monitoring cardiac status are also provided.
