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During each heartbeat, approximately 71 cm3 of blood is pushed from the heart at an average pressure of 105 mm-Hg. Calculate the power output of the heart, in watts, assuming 68 beats per minute.

  • Physics -

    The work required per beat is
    W = V*deltaP, where V is the volume pumped and delta p is the pressure increase provided. To get that in Joules, V must be in m^3 and deltaP must be in Pascals.

    W = 71*10^-6 m^3*(105/760)*1.01*10^5 Pa
    = 0.99 J
    divide that by the time between beats, (60 sec/min)/(68 beat/min)= 0.88 s

    The result is 0.99/0.88 = 1.13 Watts

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