Gear Shifting of Quadriceps during Isometric Knee Extension Disclosed Using Ultrasonography

Joint Authors

Zhang, Shu
Huang, Weijian
Zeng, Yu
Shi, Wenxiu
Diao, Xianfen
Wei, Xiguang
Ling, Shan

Source

BioMed Research International

Issue

Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-7, 7 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2018-03-18

Country of Publication

Egypt

No. of Pages

7

Main Subjects

Medicine

Abstract EN

Ultrasonography has been widely employed to estimate the morphological changes of muscle during contraction.

To further investigate the motion pattern of quadriceps during isometric knee extensions, we studied the relative motion pattern between femur and quadriceps under ultrasonography.

An interesting observation is that although the force of isometric knee extension can be controlled to change almost linearly, femur in the simultaneously captured ultrasound video sequences has several different piecewise moving patterns.

This phenomenon is like quadriceps having several forward gear ratios like a car starting from rest towards maximal voluntary contraction (MVC) and then returning to rest.

Therefore, to verify this assumption, we captured several ultrasound video sequences of isometric knee extension and collected the torque/force signal simultaneously.

Then we extract the shapes of femur from these ultrasound video sequences using video processing techniques and study the motion pattern both qualitatively and quantitatively.

The phenomenon can be seen easier via a comparison between the torque signal and relative spatial distance between femur and quadriceps.

Furthermore, we use cluster analysis techniques to study the process and the clustering results also provided preliminary support to the conclusion that, during both ramp increasing and decreasing phases, quadriceps contraction may have several forward gear ratios relative to femur.

American Psychological Association (APA)

Zhang, Shu& Huang, Weijian& Zeng, Yu& Shi, Wenxiu& Diao, Xianfen& Wei, Xiguang…[et al.]. 2018. Gear Shifting of Quadriceps during Isometric Knee Extension Disclosed Using Ultrasonography. BioMed Research International،Vol. 2018, no. 2018, pp.1-7.
https://search.emarefa.net/detail/BIM-1127887

Modern Language Association (MLA)

Zhang, Shu…[et al.]. Gear Shifting of Quadriceps during Isometric Knee Extension Disclosed Using Ultrasonography. BioMed Research International No. 2018 (2018), pp.1-7.
https://search.emarefa.net/detail/BIM-1127887

American Medical Association (AMA)

Zhang, Shu& Huang, Weijian& Zeng, Yu& Shi, Wenxiu& Diao, Xianfen& Wei, Xiguang…[et al.]. Gear Shifting of Quadriceps during Isometric Knee Extension Disclosed Using Ultrasonography. BioMed Research International. 2018. Vol. 2018, no. 2018, pp.1-7.
https://search.emarefa.net/detail/BIM-1127887

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1127887