Association of Age with the Threshold for Detecting Ankle Inversion and Eversion in Upright stance

1995 ◽  
Vol 24 (1) ◽  
pp. 58-66 ◽  
Author(s):  
M. G. GILSING ◽  
C. G. VAN DEN BOSCH ◽  
S-G. LEE ◽  
J. A. ASHTON-MILER ◽  
N. B. ALEXANDER ◽  
...  
Robotica ◽  
2017 ◽  
Vol 36 (2) ◽  
pp. 298-311
Author(s):  
Lei Cui ◽  
Andy Isaac ◽  
Garry Allison

SUMMARYAnkle inversion is a common injury of musculoskeletal system among athletes and also in the older population. Investigation into ankle inversion requires quantitative assessment of the smallest amount of height/angle change in the floor that can be perceived by human. Blocks of different thickness have been used to change floor height manually during tests. We aimed to develop an automatic apparatus that is able to provide improved height and angle resolutions for dynamic ankle proprioception. We designed and manufactured a five-bar planar robot with one coupler serving as the mobile platform. We used a stiffening rib to achieve consistent differences in deflection across the workspace of the mobile platform. The reported robot translates at the maximal speed 423 mm/s with a resolution at 0.21 mm under a maximal load of 358 kg. This robot allows for increased sensitivity, which may lead to further investigation of functional proprioceptive ability and reflect finely tuned sensory requirements for upright stance.


2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Patrick Fuerst ◽  
Albert Gollhofer ◽  
Markus Wenning ◽  
Dominic Gehring

Abstract Background The application of ankle braces is an effective method for the prevention of recurrent ankle sprains. It has been proposed that the reduction of injury rates is based on the mechanical stiffness of the brace and on beneficial effects on proprioception and neuromuscular activation. Yet, how the neuromuscular system responds to the application of various types of ankle braces during highly dynamic injury-relevant movements is not well understood. Enhanced stability of the ankle joint seems especially important for people with chronic ankle instability. We therefore aimed to analyse the effects of a soft and a semi-rigid ankle brace on the execution of highly dynamic 180° turning movements in participants with and without chronic ankle instability. Methods Fifteen participants with functional ankle instability, 15 participants with functional and mechanical ankle instability and 15 healthy controls performed 180° turning movements in reaction to light signals in a cross-sectional descriptive laboratory study. Ankle joint kinematics and kinetics as well as neuromuscular activation of muscles surrounding the ankle joint were determined. Two-way repeated measures analyses of variance and post-hoc t-tests were calculated. Results Maximum ankle inversion angles and velocities were significantly reduced with the semi-rigid brace in comparison to the conditions without a brace and with the soft brace (p ≤ 0.006, d ≥ 0.303). Effect sizes of these reductions were larger in participants with chronic ankle instability than in healthy controls. Furthermore, peroneal activation levels decreased significantly with the semi-rigid brace in the 100 ms before and after ground contact. No statistically significant brace by group effects were found. Conclusions Based on these findings, we argue that people with ankle instability in particular seem to benefit from a semi-rigid ankle brace, which allows them to keep ankle inversion angles in a range that is comparable to values of healthy people. Lower ankle inversion angles and velocities with a semi-rigid brace may explain reduced injury incidences with brace application. The lack of effect of the soft brace indicates that the primary mechanism behind the reduction of inversion angles and velocities is the mechanical resistance of the brace in the frontal plane.


2019 ◽  
Vol 10 ◽  
Author(s):  
Takahide Etani ◽  
Akito Miura ◽  
Masahiro Okano ◽  
Masahiro Shinya ◽  
Kazutoshi Kudo

2008 ◽  
Vol 41 ◽  
pp. S195
Author(s):  
Judith R. Meakin ◽  
Jennifer S. Gregory ◽  
Francis W. Smith ◽  
Fiona J. Gilbert ◽  
Richard M. Aspden

1996 ◽  
Vol 1 (4) ◽  
pp. 192-197 ◽  
Author(s):  
S. Pahor ◽  
R. Toppenberg

2016 ◽  
Vol 30 (1) ◽  
pp. 19-27
Author(s):  
Flavio BESSI

Abstract Worldwide trainers ask if there is a rotation scheme, which facilitate the learning of the elements with longitudinal rotations. Although there are some research on it, they did not attempt to verify a total scheme, but merely to see the relationship between two elements or four elements. In this study we analyse the appreciation of experts N = 161 coaches (age: 34.9 ± 10.9) from different levels of expertise and from different countries (ARG, BOL, BRA, CHI, ECU, ELS, GER, GUA, HON, MEX, PAN, PER, URU, VEN) with 12 ± 8.8 years of experience regardinghow gymnasts should execute 27 different elements in 5 male apparatus. We chose these elements, because we wanted to have movements with rotation in upright stance, upside down and in combination with transversal rotation. Through a questionnaire for coaches, we tried to verify if there are differences, coincidences or even immovable rules in the rotation scheme that gymnasts use (or should use). The answers were typologized with three categories of rotational preference: unilateral consistent twister, bilateral consistent twister and inconsistent twister. The study aimed to answer several questions: Do coaches agree on how the rotation scheme should be in gymnastics? How do coaches (former gymnasts) determined which way to turn? Do the handedness or the footedness influence on the direction of rotation? Does the personal rotation scheme influence on the concept of appropriate rotation scheme? Do the national practices influence the rotation scheme? Are there differences in appreciation between coaches at different levels? Are unambiguous rules among the elements?


1997 ◽  
Vol 25 (1) ◽  
pp. 54-58 ◽  
Author(s):  
Lars Konradsen ◽  
Michael Voigt ◽  
Charlotte Hojsgaard
Keyword(s):  

2008 ◽  
Vol 16 (2) ◽  
pp. 101-105 ◽  
Author(s):  
Yang Hua Lin ◽  
Chen Wei Li ◽  
Li Ying Tsai ◽  
Rong-Jiuan Liing

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