40293
2017
2017
eng
11
postprint
1
--
2017-11-03
--
Effects of different medial arch support heights on rearfoot kinematics
Background
Foot orthoses are usually assumed to be effective by optimizing mechanically dynamic rearfoot configuration. However, the effect from a foot orthosis on kinematics that has been demonstrated scientifically has only been marginal. The aim of this study was to examine the effect of different heights in medial arch-supported foot orthoses on rear foot motion during gait.
Methods
Nineteen asymptomatic runners (36±11years, 180±5cm, 79±10kg; 41±22km/week) participated in the study. Trials were recorded at 3.1 mph (5 km/h) on a treadmill. Athletes walked barefoot and with 4 different not customized medial arch-supported foot orthoses of various arch heights (N:0 mm, M:30 mm, H:35 mm, E:40mm). Six infrared cameras and the `Oxford Foot Model´ were used to capture motion. The average stride in each condition was calculated from 50 gait cycles per condition. Eversion excursion and internal tibia rotation were analyzed. Descriptive statistics included calculating the mean ± SD and 95% CIs. Group differences by condition were analyzed by one factor (foot orthoses) repeated measures ANOVA (α = 0.05).
Results
Eversion excursion revealed the lowest values for N and highest for H (B:4.6°±2.2°; 95% CI [3.1;6.2]/N:4.0°±1.7°; [2.9;5.2]/M:5.2°±2.6°; [3.6;6.8]/H:6.2°±3.3°; [4.0;8.5]/E:5.1°±3.5°; [2.8;7.5]) (p>0.05). Range of internal tibia rotation was lowest with orthosis H and highest with E (B:13.3°±3.2°; 95% CI [11.0;15.6]/N:14.5°±7.2°; [9.2;19.6]/M:13.8°±5.0°; [10.8;16.8]/H:12.3°±4.3°; [9.0;15.6]/E:14.9°±5.0°; [11.5;18.3]) (p>0.05). Differences between conditions were small and the intrasubject variation high.
Conclusion
Our results indicate that different arch support heights have no systematic effect on eversion excursion or the range of internal tibia rotation and therefore might not exert a crucial influence on rear foot alignment during gait.
urn:nbn:de:kobv:517-opus4-402934
online registration
PLoS one 12 (2017) Nr. 3. - DOI: 10.1371/journal.pone.0172334
<a href="http://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/40292">Bibliographieeintrag der Originalveröffentlichung/Quelle</a>
CC-BY - Namensnennung 4.0 International
Gunnar Wahmkow
Michael Cassel
Frank Mayer
Heiner Baur
Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe
348
Naturwissenschaften und Mathematik
Medizin und Gesundheit
open_access
Strukturbereich Kognitionswissenschaften
Referiert
Open Access
Universität Potsdam
https://publishup.uni-potsdam.de/files/40293/phr348_online.pdf
40292
2017
2017
eng
3
12
article
PLoS
Lawrence, Kan.
1
--
2017-03-03
--
Effects of different medial arch support heights on rearfoot kinematics
Background
Foot orthoses are usually assumed to be effective by optimizing mechanically dynamic rearfoot configuration. However, the effect from a foot orthosis on kinematics that has been demonstrated scientifically has only been marginal. The aim of this study was to examine the effect of different heights in medial arch-supported foot orthoses on rear foot motion during gait.
Methods
Nineteen asymptomatic runners (36±11years, 180±5cm, 79±10kg; 41±22km/week) participated in the study. Trials were recorded at 3.1 mph (5 km/h) on a treadmill. Athletes walked barefoot and with 4 different not customized medial arch-supported foot orthoses of various arch heights (N:0 mm, M:30 mm, H:35 mm, E:40mm). Six infrared cameras and the `Oxford Foot Model´ were used to capture motion. The average stride in each condition was calculated from 50 gait cycles per condition. Eversion excursion and internal tibia rotation were analyzed. Descriptive statistics included calculating the mean ± SD and 95% CIs. Group differences by condition were analyzed by one factor (foot orthoses) repeated measures ANOVA (α = 0.05).
Results
Eversion excursion revealed the lowest values for N and highest for H (B:4.6°±2.2°; 95% CI [3.1;6.2]/N:4.0°±1.7°; [2.9;5.2]/M:5.2°±2.6°; [3.6;6.8]/H:6.2°±3.3°; [4.0;8.5]/E:5.1°±3.5°; [2.8;7.5]) (p>0.05). Range of internal tibia rotation was lowest with orthosis H and highest with E (B:13.3°±3.2°; 95% CI [11.0;15.6]/N:14.5°±7.2°; [9.2;19.6]/M:13.8°±5.0°; [10.8;16.8]/H:12.3°±4.3°; [9.0;15.6]/E:14.9°±5.0°; [11.5;18.3]) (p>0.05). Differences between conditions were small and the intrasubject variation high.
Conclusion
Our results indicate that different arch support heights have no systematic effect on eversion excursion or the range of internal tibia rotation and therefore might not exert a crucial influence on rear foot alignment during gait.
PLoS one
10.1371/journal.pone.0172334
28257426
1932-6203
Universität Potsdam, Publikationsfonds
PA 2017_50
1675.03
online registration
WOS:000396021100016
e0172334
<a href="http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-402934">Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Humanwissenschaftliche Reihe ; 348</a>
CC-BY - Namensnennung 4.0 International
Gunnar Wahmkow
Michael Cassel
Frank Mayer
Heiner Baur
Naturwissenschaften und Mathematik
Medizin und Gesundheit
Strukturbereich Kognitionswissenschaften
Referiert
Publikationsfonds der Universität Potsdam
Open Access
Universität Potsdam
51878
2018
2018
eng
70
75
6
66
article
Elsevier
Clare
1
2018-08-20
--
--
Is in-toing gait physiological in children?
Research question: This study aimed to establish reference values in 1-14 year old healthy children and to implement FPA-percentile curves for daily clinical use. Methods: 5910 healthy children performed at least 3 repetitions of barefoot walking over an instrumented walkway using a pressure measurement platform. The FPA [degrees] was extracted and analyzed by age and gender (mean +/- standard deviation; median with percentiles, MANOVA (age, gender) and Wilcoxon-Signed-Rank test for intra-individual side differences (alpha = 0.05). Results: FPA maximum was observed in 2-year-old children and diminished significant until the age of 4 to moderate out-toeing. For ages 5-14, no statistically significant differences in FPA values were present (p > 0.05). MANOVA confirmed age (p < 0.001) and gender (p < 0.001) as significant FPA influencing factors, without combined effect (p > 0.05). In every age group, right feet showed significantly greater out-toeing (p < 0.05). Significance: Percentile values indicate a wide FPA range in children. FPA development in young children shows a spontaneous shift towards moderate external rotation (age 2-4), whereby in-toeing <= 1-5 degrees can be present, but can return to normal. Bilateral in-toeing after the age of four and unilateral in-toeing after the age of seven should be monitored.
Gait & posture
Results of a large cohort study in 5910 healthy (pre-) school children
10.1016/j.gaitpost.2018.08.019
30170136
0966-6362
1879-2219
wos:2018
WOS:000445764700012
Verch, R (reprint author), Univ Outpatient Clin Potsdam, Dept Sports & Hlth Sci, Clin Exercise Sci, Neuen Palais 10 Haus 12, D-14471 Potsdam, Germany., verch@uni-potsdam.de
Federation of the German Footwear Industry (HDS, Offenbach, Germany); Ricosta Schuhfabriken GmbH (Donaueschingen, Germany); University of Potsdam (Potsdam, Germany)
2021-09-22T08:13:47+00:00
sword
importub
filename=package.tar
380aeaf79e317ca3cfa80231d026c89e
Verch, Ronald
false
true
Ronald Verch
Anja Hirschmüller
Juliane Müller
Heiner Baur
Frank Mayer
Steffen Müller
eng
uncontrolled
Foot progression angle
eng
uncontrolled
Children
eng
uncontrolled
In-toeing
eng
uncontrolled
Out-toeing
eng
uncontrolled
Gait
Medizin und Gesundheit
Department Sport- und Gesundheitswissenschaften
Import
35921
2012
2012
eng
943
943
1
44
conferenceobject
Lippincott Williams & Wilkins
Philadelphia
1
--
--
--
The effect of foot orthoses on peroneal H-reflex in treadmill walking a pilot study
Medicine and science in sports and exercise : official journal of the American College of Sports Medicine
0195-9131
wos:2011-2013
WOS:000310363304728
Antje Reschke
Martin Wolter
Marlene Schöpflin
Niklas König
Frank Mayer
Heiner Baur
Referiert
Department Sport- und Gesundheitswissenschaften
Institut für Sportmedizin und Prävention
37194
2011
2011
eng
63
70
8
2
19
article
IOS Press
Amsterdam
1
--
--
--
Higher velocities in isokinetic dynamometry a pilot study of new test mode with active compensation of inertia
Isokinetic dynamometry is a standard technique for strength testing and training. Nevertheless reliability and validity is limited due to inertia effects, especially for high velocities. Therefore in a first methodological approach the purpose was to evaluate a new isokinetic measurement mode including inertia compensation compared to a classic isokinetic measurement mode for single and multijoint movements at different velocities.
Isokinetic maximum strength measurements were carried out in 26 healthy active subjects. Tests were performed using classic isokinetic and new isokinetic mode in random order. Maximum torque/force, maximum movement velocity and time for acceleration were calculated. For inter-instrument agreement Bland and Altman analysis, systematic and random error was quantified. Differences between both methods were assessed (ANOVA alpha = 0.05).
Bland and Altman analysis showed the highest agreement between the two modes for strength and velocity measurements (bias: < +/- 1.1%; LOA: < 14.2%) in knee flexion/extension at slow isokinetic velocity (60 degrees/s). Least agreement (range: bias: -67.6% +/- 119.0%; LOA: 53.4% 69.3%) was observed for shoulder/arm test at high isokinetic velocity (360 degrees/s). The Isokin(new) mode showed higher maximum movement velocities (p < 0.05).
For low isokinetic velocities the new mode agrees with the classic mode. Especially at high isokinetic velocities the new isokinetic mode shows relevant benefits coupled with a possible trade-off with the force/torque measurement. In conclusion, this study offers for the first time a comparison between the 'classical' and inertia-compensated isokinetic dynamometers indicating the advantages and disadvantages associated with each individual approach, particularly as they relate to medium or high velocities in testing and training.
Isokinetics and exercise science : official journal of the European Isokinetic Society
10.3233/IES-2011-0398
0959-3020
wos:2011-2013
WOS:000291879900001
Mueller, S (reprint author), Univ Potsdam, Univ Outpatient Clin Potsdam, Neuen Palais 10,Haus 12, D-14469 Potsdam, Germany., stefmue@uni-potsdam.de
Steffen Müller
Patrizia Mayer
Heiner Baur
Frank Mayer
eng
uncontrolled
Strength testing
eng
uncontrolled
concentric
eng
uncontrolled
validity
eng
uncontrolled
trunk
eng
uncontrolled
knee
eng
uncontrolled
shoulder
Referiert
Department Sport- und Gesundheitswissenschaften
Institut für Sportmedizin und Prävention
37874
2014
2014
eng
642
642
1
5
46
conferenceobject
Lippincott Williams & Wilkins
Philadelphia
1
--
--
--
Trunk strength in adolescent athletes with Spondylolisthesis with/without back pain during training: Pilot study
Medicine and science in sports and exercise : official journal of the American College of Sports Medicine
0195-9131
1530-0315
wos:2014
61st Annual Meeting of the American-College-of-Sports-Medicine
APR 01-04, 2014
WOS:000339115904197
Atlanta, GA
Steffen Müller
Michael Cassel
Juliane Müller
Josefine Stoll
Heiner Baur
Frank Mayer
Referiert
Department Sport- und Gesundheitswissenschaften
Institut für Sportmedizin und Prävention
36060
2012
2012
eng
389
394
6
3
35
article
Elsevier
Clare
1
--
--
--
Static and dynamic foot characteristics in children aged 1-13 years a cross-sectional study
The aim of this study was to acquire static and dynamic foot geometry and loading in childhood, and to establish data for age groups of a population of 1-13 year old infants and children.
A total of 10,382 children were recruited and 7788 children (48% males and 52% females) were finally included into the data analysis. For static foot geometry foot length and foot width were quantified in a standing position. Dynamic foot geometry and loading were assessed during walking on a walkway with self selected speed (Novel Emed X, 100 Hz, 4 sensors/cm(2)). Contact area (CA), peak pressure (PP), force time integral (FTI) and the arch index were calculated for the total, fore-, mid- and hindfoot.
Results show that most static and dynamic foot characteristics change continuously during growth and maturation. Static foot length and width increased with age from 13.1 +/- 0.8 cm (length) and 5.7 +/- 0.4 cm (width) in the youngest to 24.4 +/- 1.5 cm (length) and 8.9 +/- 0.6 cm (width) in the oldest. A mean walking velocity of 0.94 +/- 0.25 m/s was observed. Arch-index ranged from 0.32 +/- 0.04 [a.u.] in the one-year old to 0.21 +/- 0.13 [a.u.] in the 5-year olds and remains constant afterwards.
This study provides data for static and dynamic foot characteristics in children based on a cohort of 7788 subjects. Static and dynamic foot measures change differently during growth and maturation. Dynamic foot measurements provide additional information about the children's foot compared to static measures.
Gait & posture
10.1016/j.gaitpost.2011.10.357
0966-6362
wos:2011-2013
WOS:000302453200007
Muller, S (reprint author), Univ Potsdam, Univ Outpatient Clin, Neuen Palais 10,Haus 12, D-14469 Potsdam, Germany., stefmue@uni-potsdam.de
Federation of the German Footwear Industry (HDS, Offenbach, Germany);
RICOSTA Schuhfabriken GmbH (Donaueschingen, Germany); University of
Potsdam (Potsdam, Germany)
Steffen Müller
Anja Carlsohn
Juliane Müller
Heiner Baur
Frank Mayer
eng
uncontrolled
Children
eng
uncontrolled
Foot
eng
uncontrolled
Geometry
eng
uncontrolled
Arch-index
eng
uncontrolled
Plantar pressure
Referiert
Department Sport- und Gesundheitswissenschaften
Institut für Sportwissenschaft
9010
2016
2016
eng
postprint
1
--
--
--
Influence of Obesity on Foot Loading Characteristics in Gait for Children Aged 1 to 12 Years
Background
Overweight and obesity are increasing health problems that are not restricted to adults only. Childhood obesity is associated with metabolic, psychological and musculoskeletal comorbidities. However, knowledge about the effect of obesity on the foot function across maturation is lacking. Decreased foot function with disproportional loading characteristics is expected for obese children. The aim of this study was to examine foot loading characteristics during gait of normal-weight, overweight and obese children aged 1-12 years.
Methods
A total of 10382 children aged one to twelve years were enrolled in the study. Finally, 7575 children (m/f: n = 3630/3945; 7.0 +/- 2.9yr; 1.23 +/- 0.19m; 26.6 +/- 10.6kg; BMI: 17.1 +/- 2.4kg/m(2)) were included for (complete case) data analysis. Children were categorized to normalweight (>= 3rd and <90th percentile; n = 6458), overweight (>= 90rd and <97th percentile; n = 746) or obese (>97th percentile; n = 371) according to the German reference system that is based on age and gender-specific body mass indices (BMI). Plantar pressure measurements were assessed during gait on an instrumented walkway. Contact area, arch index (AI), peak pressure (PP) and force time integral (FTI) were calculated for the total, fore-, mid-and hindfoot. Data was analyzed descriptively (mean +/- SD) followed by ANOVA/Welch-test (according to homogeneity of variances: yes/no) for group differences according to BMI categorization (normal-weight, overweight, obesity) and for each age group 1 to 12yrs (post-hoc Tukey Kramer/Dunnett's C; alpha = 0.05).
Results
Mean walking velocity was 0.95 +/- 0.25 m/s with no differences between normal-weight, overweight or obese children (p = 0.0841). Results show higher foot contact area, arch index, peak pressure and force time integral in overweight and obese children (p< 0.001). Obese children showed the 1.48-fold (1 year-old) to 3.49-fold (10 year-old) midfoot loading (FTI) compared to normal-weight.
Conclusion
Additional body mass leads to higher overall load, with disproportional impact on the midfoot area and longitudinal foot arch showing characteristic foot loading patterns. Already the feet of one and two year old children are significantly affected. Childhood overweight and obesity is not compensated by the musculoskeletal system. To avoid excessive foot loading with potential risk of discomfort or pain in childhood, prevention strategies should be developed and validated for children with a high body mass index and functional changes in the midfoot area. The presented plantar pressure values could additionally serve as reference data to identify suspicious foot loading patterns in children.
urn:nbn:de:kobv:517-opus4-90108
online registration
<a href="http://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/9009">Bibliographieeintrag der Originalveröffentlichung/Quelle</a>
PA 2016_03
Universität Potsdam, Publikationsfonds
CC-BY - Namensnennung 4.0 International
Steffen Müller
Anja Carlsohn
Juliane Müller
Heiner Baur
Frank Mayer
Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe
284
eng
uncontrolled
plantar pressure distribution
eng
uncontrolled
body-mass index
eng
uncontrolled
prepubescent children
eng
uncontrolled
overweight children
eng
uncontrolled
childhood obesity
eng
uncontrolled
walking
eng
uncontrolled
speed
eng
uncontrolled
forces
eng
uncontrolled
adolescents
eng
uncontrolled
prevalence
Medizin und Gesundheit
open_access
Referiert
Open Access
Department Sport- und Gesundheitswissenschaften
Universität Potsdam
https://publishup.uni-potsdam.de/files/9010/phr_284.pdf
9009
2016
2016
eng
2
11
article
Public Library of Science
Lawrence, Kan.
1
--
2016-02-25
--
Influence of Obesity on Foot Loading Characteristics in Gait for Children Aged 1 to 12 Years
Background
Overweight and obesity are increasing health problems that are not restricted to adults only. Childhood obesity is associated with metabolic, psychological and musculoskeletal comorbidities. However, knowledge about the effect of obesity on the foot function across maturation is lacking. Decreased foot function with disproportional loading characteristics is expected for obese children. The aim of this study was to examine foot loading characteristics during gait of normal-weight, overweight and obese children aged 1-12 years.
Methods
A total of 10382 children aged one to twelve years were enrolled in the study. Finally, 7575 children (m/f: n = 3630/3945; 7.0 +/- 2.9yr; 1.23 +/- 0.19m; 26.6 +/- 10.6kg; BMI: 17.1 +/- 2.4kg/m(2)) were included for (complete case) data analysis. Children were categorized to normalweight (>= 3rd and <90th percentile; n = 6458), overweight (>= 90rd and <97th percentile; n = 746) or obese (>97th percentile; n = 371) according to the German reference system that is based on age and gender-specific body mass indices (BMI). Plantar pressure measurements were assessed during gait on an instrumented walkway. Contact area, arch index (AI), peak pressure (PP) and force time integral (FTI) were calculated for the total, fore-, mid-and hindfoot. Data was analyzed descriptively (mean +/- SD) followed by ANOVA/Welch-test (according to homogeneity of variances: yes/no) for group differences according to BMI categorization (normal-weight, overweight, obesity) and for each age group 1 to 12yrs (post-hoc Tukey Kramer/Dunnett's C; alpha = 0.05).
Results
Mean walking velocity was 0.95 +/- 0.25 m/s with no differences between normal-weight, overweight or obese children (p = 0.0841). Results show higher foot contact area, arch index, peak pressure and force time integral in overweight and obese children (p< 0.001). Obese children showed the 1.48-fold (1 year-old) to 3.49-fold (10 year-old) midfoot loading (FTI) compared to normal-weight.
Conclusion
Additional body mass leads to higher overall load, with disproportional impact on the midfoot area and longitudinal foot arch showing characteristic foot loading patterns. Already the feet of one and two year old children are significantly affected. Childhood overweight and obesity is not compensated by the musculoskeletal system. To avoid excessive foot loading with potential risk of discomfort or pain in childhood, prevention strategies should be developed and validated for children with a high body mass index and functional changes in the midfoot area. The presented plantar pressure values could additionally serve as reference data to identify suspicious foot loading patterns in children.
PLoS one
10.1371/journal.pone.0149924
1932-6203
1440.03
online registration
Universität Potsdam, Publikationsfonds
PA 2016_03
e0149924
<a href="http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-90108">Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Humanwissenschaftliche Reihe Reihe ; 284</a>
CC-BY - Namensnennung 4.0 International
Steffen Müller
Anja Carlsohn
Juliane Müller
Heiner Baur
Frank Mayer
eng
uncontrolled
plantar pressure distribution
eng
uncontrolled
body-mass index
eng
uncontrolled
prepubescent children
eng
uncontrolled
overweight children
eng
uncontrolled
childhood obesity
eng
uncontrolled
walking
eng
uncontrolled
speed
eng
uncontrolled
forces
eng
uncontrolled
adolescents
eng
uncontrolled
prevalence
Medizin und Gesundheit
Referiert
Publikationsfonds der Universität Potsdam
Open Access
Department Sport- und Gesundheitswissenschaften
11994
2006
2006
deu
article
1
--
--
--
Validität des COP-Verlaufes zur Quantifizierung der funktionalen Gangentwicklung bei Kindern
Functional gait development in children is discussed controversially. Differentiated information about the roll- over process of the foot, represented by the "Center of Pressure" (COP), are still missing. The purpose of the study was the validation of the COP-path to quantify the functional gait development of children. Plantar pressure distribution was measured barefoot with an individual speed on a walkway (tartan) - in 255 children aged between 2 and 15 years. The medial and lateral area enclosed between the COP-path and the bisection of plantar angle (A(med), A(lat), Sigma: A(ml)) was calculated from plantar pressure data. Furthermore, the duration of the COP-path in the heel (COPtimeF), midfoot (COPtimeM) and forefoot (COPtimeV) was analysed. The load distribution under the medial and lateral forefoot was also calculated. The variation coefficient (VC) was calculated as a measure of interindividual variability. The medio-lateral divergency of the COP (Aml) initially decreases with advancing age (-20.2%), followed by a continuous increase (+27.2%). No changes in VC (A(med), A(lat), and A(ml)) appeared during age-related development. COPtimeM remains constant in all children over time. In contrast to COPtimeM, Cop(time)F decreases from youngest to oldest children (-31.0%), and COPtimeV increases (+41.7%). After initial descent up to 8 years of age, VC (COPtimeF, COPtimeM, COPtimeV) remains constant. The mediolateral load under the forefoot did not change. The COP-Path is able to characterise the functional gait development of children. VC values indicate high individual variability of gait pattern. In this context, age-based standard values should be critically discussed
allegro:1991-2014
10101544
Deutsche Zeitschrift für Sportmedizin. - 57 (2006), 4, S. 95 -100
Steffen Müller
Heiner Baur
Anja Hirschmueller
Frank Mayer
Nicht referiert
Department Sport- und Gesundheitswissenschaften
Institut für Sportmedizin und Prävention