A study of the forces on the body in athletic activities with particular reference to jumping

The study is primarily concerned with the analysis of cinematographic
records of human movement. Computational techniques for smoothing and
differentiation of numerical data are examined and a suitable method is
established as a computer programme. The programme accepts displacement
data from cine film of a body action and produces inertia force components
of the body segments.
The equation of motion is expressed in terms of a sumation of segmental
forces. The computed results are compared with the total reaction measured
on a force platform and arc also used to indicate the segmental contributions
in the sunmation.
The analytical procedures are general, but are here applied to cimp2e
athletic activities. Discussion of body motion and external force action
is followed by estimation of the internal effects in muscles and joints in
the lower limbs.
During the course of the work, discussion of segmental models of the
human body and of scum mechanical principles is undertaken. These sections
range beyond the requirements of the central study and offer some broader
considerations in movement analysis.