Flat foot as one of the lower extremity deformities might change some kinetic variables of gait. Fatigue can deteriorate the muscle ability in supporting joints and can alter the vertical ground reaction force (GRF) [1, 2]. This study examined the fatigue effect on vertical GRF in individuals with flat feet compared with a normal group during barefoot walking.
Materials and methods
Seventeen subjects with flat feet and 17 normal subjects completed the test. Three vertical GRF measures (F1; the first peak force, F2; minimum force; and F3; the second peak force) were extracted before and after a functional fatigue protocol. To check the homogeneity of the velocity among conditions, the average velocity of the anteroposterior center of pressure (COPy) excursion was calculated. A repeated measure ANOVA was conducted to analyze data.
Anzeige
Results
For the average COPy velocity, no significant fatigue, group and interaction effects were seen. F2 was higher in the flat feet group compared with the normal group (p < 0.05). The fatigue protocol resulted in higher F2 and lower F3 in both groups (p < 0.05). See Figure 1. as the sample vertical GRF curves for a subject with flat feet and a subject with normal feet after fatigue.
Figure 1
Vertical GRF curves for a subject with flat feet and a subject with normal feet after fatigue.
×
Conclusions
The higher F2 in the flat feet group, which results in a decrease drop in vertical GRF, might be due to more flexible foot joints. Foot muscles lose their appropriate ability to control the foot joints and MLA due to fatigue [2‐4] which results in higher F2 for both groups. Furthermore the muscles could not make a proper lever arm for the propulsion gait phase after fatigue [2] resulting in lower F3 for both groups.
Acknowledgement
This study was funded and supported by Tehran University of Medical Sciences.
Open Access
This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution License (
https://creativecommons.org/licenses/by/2.0
), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Der Einsatz von Operationsrobotern für den Einbau von Totalendoprothesen des Kniegelenks hat die Präzision der Eingriffe erhöht. Für die postoperative Zufriedenheit der Patienten scheint das aber unerheblich zu sein, wie eine Studie zeigt.
Mit dem Hebelzeichen-Test lässt sich offenbar recht zuverlässig feststellen, ob ein vorderes Kreuzband gerissen ist. In einer Metaanalyse war die Vorhersagekraft vor allem bei positivem Testergebnis hoch.
Extreme Arbeitsverdichtung und kaum Supervision: Dr. Andrea Martini, Sprecherin des Bündnisses Junge Ärztinnen und Ärzte (BJÄ) über den Frust des ärztlichen Nachwuchses und die Vorteile des Rucksack-Modells.
Bewegungs-, Dehnungs- und Entspannungsübungen im Wasser lindern die Beschwerden von Patientinnen mit Fibromyalgie besser als das Üben auf trockenem Land. Das geht aus einer spanisch-brasilianischen Vergleichsstudie hervor.
Update Orthopädie und Unfallchirurgie
Bestellen Sie unseren Fach-Newsletter und bleiben Sie gut informiert.
