Question

Explain running with thermodynamic principles thoroughly.

Answer 1

Thermodynamic helps to defines so many of process occurring in the universe i.e. entropy of the universe, heat engine, spontaneity of the process etc.

Principles of thermodynamics help not only to in these systems but also in biological systems as well. Thermodynamics of running is one of the examples.

suppose a person is running with an average velocity of 'V' with the length of a single stride 'L' then average velocity is given by:

where, is the frequency at which feet strikes the ground.

Power for running=(internal work done by the muscles of the body)*(frequency)

People did experiments to get the relation between the average velocity and the length of strides and the following results they got:

The following conclusion they got out of this experiment:

• Increase in L increases the velocity of the runner until it becomes equal to the height of the runner after that he has to increase the frequency to get higher velocity.

work done by the human body isn't an easy task to calculate as it is being internally.

Analogous to the vehicle engine internal work done by the engine has to overcome the wing drag, floor friction and accelerate the car.

similarly work done by the runner has three component, work done to overcome the gravity effect, to accelerate the body and to overcome the wind resistance.

Wint = (kinetic energy) + (Potential energy) + (against wind resistance)

Kinetic and potential are periodic and the time average of these two will be zero while work against the wind is steady.

Runner body deaccelerate on every step when he touches the ground so he has to do work to regain the kinetic energy also center of gravity comes downside when he touches the ground so he has to do work to regain the potential energy.

people have defined the work for the aerobic, Zumba etc as well in the same manner.

One can think of defining the psychological work as well where the whole body is still but still, we get tired mentally.