To evaluate variations in plantar center of pressure and the subsequent postural balance in the presence of induced head anteposition, a pre-experimental cross-sectional study was conducted in 30 male subjects aged 20 to 25 years, with no head anteposition, measuring 1.
The orthostatic position of the head was determined by matching the tragus and the acromion with a plumb line, accepting a head anteposition with a limit established by the coincidence between the posterior edge of the pinna and the acromion.
Each selected subject was asked to step barefoot to the model 9286BA Kistler[R] force plate (Figure 1) in order to collect the data corresponding to their plantar center of pressure and their variations by inducing a gradual anteposition of the head.
For the second measurement, a second plumb line was located 1 cm ahead of the previous plumb line, asking the subject to return to IP in relation to plumb line 0 and from that position produce a head anteposition until the point marked on the tragus coincided with the plumb line to 1 cm.
The linear tendency of the difference in displacement between COP control and each COP yielded by the various levels of anteposition to which subjects were exposed was in decrease for the x-axis, while on the y-axis the tendency was in the increase in this difference (Figure 2).
COP displacement on the x-axis and the y-axis was statistically significant when comparing each level of induction of head anteposition with its control, yielding a p-value of < 0.
This allows to establish that subjects' height does not condition the displacement of the plantar center of pressure induced by anteposition of the skull.
Interestingly enough, in this study the COP on the x-axis tended to decrease in all the tests in which subjects were exposed to head anteposition.
2] and, on the other hand, between auditory perception, the sentential nature of the InfC and the anteposition of [NP.
It is the general anteposition in French that causes this rather high number of anteposed nondynamic N[P.
8%) infinitives in Spanish (Table 9) can be explained by the general postposition tendency of this language; the small difference between postposition and anteposition of N[P.
Keenan (1976) proposes a series of formal indicators of the subject function: verbal agreement, nominative case markings and anteposition.