However, until we began our latest investigation, no study had looked into the actual effects of facial expressions on movement economy
or perceived effort during endurance activity that has a longer duration.
One of the hypotheses that can be presented to affirm the difference in V[O.sub.2] between the two ergometers is that the specificity of the movements performed in the ergometers is linked to the individual's movement economy
. When performing a movement several times, both in training and in competition, there are predictable adaptations that take place in the athletes' physiological and biomechanical responses.
Furthermore, EMA can induce disturbances in movement economy
and energy expenditure, so that dancers spend more energy during a routine than usual.