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Fig. 2. Experimental records of running on Earth (A) and during a flight profile
simulating 1.3 g (B). (A) Fore–aft
(Ff) and vertical (Fv) components of
the force exerted by the foot on the force platform during running between the
two photocells at the indicated speeds on Earth. (B) From top to bottom at
each speed are shown the vertical (av), lateral
(al), and fore–aft (af)
components of the acceleration recorded on the aircraft during the run; the
force signals Ff and Fv from the force
platform (noise is due to vibrations of the aircraft) and the output of the
photocell circuit. The vertical dotted lines delimit the time interval
corresponding to the steps illustrated in
Fig. 3, with expansion of the
energy records to include the previous valley of potential energy as described
in the Materials and methods. Subject A, mass 72 kg.
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