Blenkinsop2016a.pdf (365.82 kB)
Evaluating feedback time delay during perturbed and unperturbed balance in handstand
journal contribution
posted on 2020-11-24, 10:54 authored by Glen BlenkinsopGlen Blenkinsop, Matthew PainMatthew Pain, Michael HileyMichael HileyFeedback delays in balance are often assessed using muscle activity onset latencies in response to discrete perturbations. The purpose of the study was to calculate EMG latencies in perturbed handstand, and determine if delays are different to unperturbed handstand. Twelve national level gymnasts completed 12 perturbed and 10 unperturbed (five eyes open and five closed) handstands. Forearm EMG latencies during perturbed handstands were assessed against delay estimates calculated via: cross correlations of wrist torque and COM displacement, a proportional and derivative model of wrist torque and COM displacement and velocity (PD model), and a PD model incorporating a passive stiffness component (PS-PD model). Delays from the PD model (161 ± 14 ms) and PS-PD model (188 ± 14 ms) were in agreement with EMG latencies (165 ± 14 ms). Cross correlations of COM displacement and wrist torque provided unrealistically low estimates (5 ± 9 ms). Delays were significantly lower during perturbed (188 ± 14 ms) compared to unperturbed handstand (eyes open: 207 ± 12 ms; eyes closed: 220 ± 19 ms). Significant differences in delays and model parameters between perturbed and unperturbed handstand support the view that balance measures in perturbed testing should not be generalised to unperturbed balance.
History
School
- Sport, Exercise and Health Sciences
Published in
Human Movement ScienceVolume
48Pages
112 - 120Citation
BLENKINSOP, G., PAIN, M. and HILEY, M., 2016. Evaluating feedback time delay during perturbed and unperturbed balance in handstand. Human Movement Science, 48, pp.112-120.Publisher
© ElsevierVersion
- AM (Accepted Manuscript)
Publisher statement
This paper was accepted for publication in the journal Human Movement Science and the definitive published version is available at https://doi.org/10.1016/j.humov.2016.04.011Acceptance date
2016-04-30Publication date
2016-05-06Copyright date
2016ISSN
0167-9457eISSN
1872-7646Publisher version
Language
- en