Purpose to characterize the dynamic postural control during weight load shifting with and without support surface reduction with temporal metrics commonly used in linear control systems identification.

Methods From the COP coordinates temporal, global and structural parameters were calculated. Reliability of derived parameters were determined using Bland-Altman analysis.

Results For the observed population, temporal variables tend to decrease when the complexity of the task is increased with the reduction in the support surface and the non dominance.

Conclusion Delay and rise times were significantly shorter for the non-dominant limb in the anteroposterior direction when volunteers performed the same task with different limbs. In the mediolateral direction, delay and rise times were shorter in both unipodal stances with respect to their bipodal homologues. An increase in COP path length, velocity and sample entropy was observed when the support area was reduced. All parameters showed good reliability in both directions at all stances. This framework could be used in the clinical practice to assess dynamic postural control capabilities in patients whose balance is pathologically affected.

The trial was evaluated and approved by the Central Committee of Bioethics in Biomedical Practice and Research of the province of Entre Ríos.

The authors have declared no competing interest.

National University of Entre Rios. Grant PID 6174.

I confirm all relevant ethical guidelines have been followed, and any necessary IRB and/or ethics committee approvals have been obtained.

Yes

The details of the IRB/oversight body that provided approval or exemption for the research described are given below:

Central Committee of Bioethics in Biomedical Practice and Research of the province of Entre Rios gave ethical approval for this work.

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All data produced in the present study are available upon reasonable request to the authors