The variability problem of normal human walking
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The variability problem of normal human walking. / Simonsen, Erik B; Alkjær, Tine .
I: Medical Engineering & Physics, Bind 34, Nr. 2, 03.2012, s. 219-24.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - The variability problem of normal human walking
AU - Simonsen, Erik B
AU - Alkjær, Tine
N1 - Copyright © 2011 IPEM. Published by Elsevier Ltd. All rights reserved.
PY - 2012/3
Y1 - 2012/3
N2 - Previous investigations have suggested considerable inter-individual variability in the time course pattern of net joint moments during normal human walking, although the limited sample sizes precluded statistical analyses. The purpose of the present study was to obtain joint moment patterns from a group of normal subjects and to test whether or not the expected differences would prove to be statistically significant. Fifteen healthy male subjects were recorded on video while they walked across two force platforms. Ten kinematic and kinetic parameters were selected and input to a statistical cluster analysis to determine whether or not the 15 subjects could be divided into different 'families' (clusters) of walking strategy. The net joint moments showed a variability corroborating earlier reports. The cluster analysis showed that the 15 subjects could be grouped into two clusters of 5 and 10 subjects, respectively. Five parameters differed significantly, so the group of 5 subjects was characterized by (1) a higher peak knee joint extensor moment, (2) more flexed knee joint angle at heel strike, (3) during the whole stance phase, (4) lower peak knee joint flexor moment and (5) lower ankle joint angle at flat foot position. Calculation of bone-on-bone forces in the knee joint showed a value of 64 N/kg body weight in the K+ group and 55 N/kg in the K- group (p
AB - Previous investigations have suggested considerable inter-individual variability in the time course pattern of net joint moments during normal human walking, although the limited sample sizes precluded statistical analyses. The purpose of the present study was to obtain joint moment patterns from a group of normal subjects and to test whether or not the expected differences would prove to be statistically significant. Fifteen healthy male subjects were recorded on video while they walked across two force platforms. Ten kinematic and kinetic parameters were selected and input to a statistical cluster analysis to determine whether or not the 15 subjects could be divided into different 'families' (clusters) of walking strategy. The net joint moments showed a variability corroborating earlier reports. The cluster analysis showed that the 15 subjects could be grouped into two clusters of 5 and 10 subjects, respectively. Five parameters differed significantly, so the group of 5 subjects was characterized by (1) a higher peak knee joint extensor moment, (2) more flexed knee joint angle at heel strike, (3) during the whole stance phase, (4) lower peak knee joint flexor moment and (5) lower ankle joint angle at flat foot position. Calculation of bone-on-bone forces in the knee joint showed a value of 64 N/kg body weight in the K+ group and 55 N/kg in the K- group (p
KW - Adult
KW - Biomechanics
KW - Cluster Analysis
KW - Hip Joint
KW - Humans
KW - Male
KW - Mechanical Processes
KW - Walking
KW - Young Adult
U2 - 10.1016/j.medengphy.2011.07.013
DO - 10.1016/j.medengphy.2011.07.013
M3 - Journal article
C2 - 21852174
VL - 34
SP - 219
EP - 224
JO - Medical Engineering & Physics
JF - Medical Engineering & Physics
SN - 1350-4533
IS - 2
ER -
ID: 38288198