Dear Pranitha Lachireddy,

The joint power unit was normalized by the body mass of the analyzed patient (W/Kg), this allows to verify deviations between a specific patient and a control sample.

In the publications below the calculations of kinematics and kinetics are more detailed and may help to understand these calculations:

Article A gait data collection and reduction technique

Roy B. Davis, III, Sylvia Õunpuu, Dennis Tyburski and James R. Gage

- Dynamics of Human Gait

Christopher L. Vaughan, Brian L. Davis, Jeremy C. O'Connor

http://analisedemarcha.com/bibliografia.php

(pdf file - free access)

I hope this information is useful. Other books and papers are available for review.

Best Regards,

Wagner de Godoy

Dear Pranitha,

In answer to your second question, force plates alone cannot be used to calculate joint powers because of how they cannot measure joint angle data (at least in the way that I presume you are calculating them). You need a motion analysis system (either visual light videography or optoelectronics) to calculate the kinematic data of the foot and ankle. In this study:

Article Analysis of lower limb work-energy patterns in world-class r...

we used 2D high-speed videography but there are advantages to using 3D analyses with an optoelectronic system that we have used more recently. David Winter's book on biomechanics,

Article Biomechanics and Motor Control of Human Movement / D.A. Winter.

is useful for understanding the calculations and many of the limitations involved.

Best wishes,

Brian

Some more

https://www.sciencedirect.com/science/article/abs/pii/016794579190046Z

Article Biomechanics and Motor Control of Human Movement / D.A. Winter.

https://www.sciencedirect.com/science/article/abs/pii/S0031940613000266

https://www.sciencedirect.com/science/article/abs/pii/S0169260712000417