TY  - JOUR
A1  - Müller, Juliane
A1  - Müller, Steffen
A1  - Stoll, Josefine
A1  - Rector, Michael V.
A1  - Baur, Heiner
A1  - Mayer, Frank
T1  - Influence of Load on Three-Dimensional Segmental Trunk Kinematics in One-Handed Lifting: A Pilot Study
JF  - Journal of applied biomechanics
N2  - Stability of the trunk is relevant in determining trunk response to different loading in everyday tasks initiated by the limbs. Descriptions of the trunk’s mechanical movement patterns in response to different loads while lifting objects are still under debate. Hence, the aim of this study was to analyze the influence of weight on 3-dimensional segmental motion of the trunk during 1-handed lifting. Ten asymptomatic subjects were included (29 ± 3 y; 1.79 ± 0.09 m; 75 ± 14 kg). Subjects lifted 3× a light and heavy load from the ground up onto a table. Three-dimensional segmental trunk motion was measured (12 markers; 3 segments: upper thoracic area [UTA], lower thoracic area [LTA], lumbar area [LA]). Outcomes were total motion amplitudes (ROM;[°]) for anterior flexion, lateral flexion, and rotation of each segment. The highest ROM was observed in the LTA segment (anterior flexion), and the smallest ROM in the UTA segment (lateral flexion). ROM differed for all planes between the 3 segments for both tasks (P < .001). There were no differences in ROM between light and heavy loads (P > .05). No interaction effects (load × segment) were observed, as ROM did not reveal differences between loading tasks. Regardless of weight, the 3 segments did reflect differences, supporting the relevance of multisegmental analysis.
KW  - trunk motion
KW  - kinematic trunk model
KW  - everyday task
KW  - MiSpEx*
Y1  - 2016
U6  - https://doi.org/10.1123/jab.2015-0227
SN  - 1065-8483
SN  - 1543-2688
VL  - 32
SP  - 520
EP  - 525
PB  - Human Kinetics Publ.
CY  - Champaign
ER  - 
TY  - JOUR
A1  - Intziegianni, Konstantina
A1  - Cassel, Michael
A1  - Rauf, S.
A1  - White, S.
A1  - Rector, Michael V.
A1  - Kaplick, Hannes
A1  - Wahmkow, Gunnar
A1  - Kratzenstein, S.
A1  - Mayer, Frank
T1  - Influence of Age and Pathology on Achilles Tendon Properties During a Single-leg Jump
JF  - International journal of sports medicine
N2  - Prevalence of Achilles tendinopathy increases with age leading to a weaker tendon with predisposition to rupture. Conclusive evidence of the influence of age and pathology on Achilles tendon (AT) properties remains limited, as previous studies are based on standardized isometric conditions. The study investigates the influence of age and pathology on AT properties during single-leg vertical jump (SLVJ). 10 children (C), 10 asymptomatic adults (A), and 10 tendinopathic patients (T) were included. AT elongation [mm] from rest to maximal displacement during a SLVJ on a force-plate was sonographically assessed. AT compliance [mm/N]) and strain [%] was calculated by dividing elongation by peak ground reaction force [N] and length, respectively. One-way ANOVA followed by Bonferroni post-hoc correction (=0.05) were used to compare C with A and A with T. AT elongation (p=0.004), compliance (p=0.001), and strain were found to be statistically significant higher in C (27 +/- 3mm, 0.026 +/- 0.006[mm/N], 13 +/- 2%) compared to A (21 +/- 4mm, 0.017 +/- 0.005[mm/N], 10 +/- 2%). No statistically significant differences (p0.05) was found between A and T (25 +/- 5mm, 0.019 +/- 0.004[mm/N], 12 +/- 3%). During SLVJ, tendon responded differently in regards to age and pathology with children having the most compliant AT. Higher compliance found in healthy tendons might be considered as a protective factor against load-related injuries.
KW  - children
KW  - tendinopathy
KW  - compliance
KW  - dynamic
KW  - ultrasonography
Y1  - 2016
U6  - https://doi.org/10.1055/s-0042-108198
SN  - 0172-4622
SN  - 1439-3964
VL  - 37
SP  - 973
EP  - 978
PB  - Thieme
CY  - Stuttgart
ER  -