Authors:
Sandra Hellmers
1
;
Sebastian Fudickar
1
;
Lena Dasenbrock
1
;
Andrea Heinks
1
;
Jürgen M. Bauer
2
and
Andreas Hein
1
Affiliations:
1
Carl von Ossietzky University Oldenburg, Germany
;
2
Heidelberg University and Agaplesion Bethanien Hospital Heidelberg, Germany
Keyword(s):
Force Platform, Counter Movement Jump, Vertical Jump, Balance, Strength, Geriatric Assessment, Jump Landing, DPSI.
Related
Ontology
Subjects/Areas/Topics:
Biomedical Engineering
;
Health Information Systems
;
Physiological Modeling
Abstract:
Counter movement jumps (CMJ) are well-suited to measure the muscle power and balance. Since it has been
clarified that well accepted CMJ amplification-based balance measures (such as TTS or CoP) are significantly
influenced by algorithmic, and measurement settings and thus, measurement results have limited meaningfulness
among force platforms, we introduce a new model-based approach measuring the postural stability.
In this, during the landing and recovery phases after vertical jumps, the lower extremities can be represented
by an oscillating system and the corresponding transfer function is described by a second-order delay (PT2)
element.
In an initial prospective study with 20 subjects aged over 70 years, we observed an inverse relationship between
the calculated parameter w and the jump height and could also identify an influence of sex, and body
weight on the jump height. Furthermore, we also found a relation between the parameter w and the dynamic
postural stability index (DPSI)
, even though these results must be ensured statistically using a larger cohort,
due to the current limited number of subjects.
Nevertheless, we could confirm the general applicability of the Systems and Control Technology perspective
on describing human movements in a potentially more robust manner than current amplification based approaches.
Further investigations on our model and the oscillating behavior in the phase of landing are needed
to improve our system and to interpret the calculated parameters in a technical and physiological point of view.
(More)