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  • Kirsten Albracht (40)
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  • IfB - Institut für Bioengineering (40)
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Kinematische Untersuchung der Kurbelbewegung im Handcycling: Entwicklung einer sportartspezifischen Methode (2015)
Thomas Abel ; Dominik Bonin ; Kirsten Albracht ; Sebastian Zeller ; Brendan Burkett
Isokinematic leg extension training with an industrial robot (2016)
Melanie Kolditz ; Thivaharan Albin ; Kirsten Albracht ; Gert-Peter Brüggemann ; Dirk Abel
Evaluation of foot position and orientation as manipulated variables to control external knee adduction moments in leg extension training (2016)
Melanie Kolditz ; Thivaharan Albin ; Dirk Abel ; Alessandro Fasse ; Gert-Peter Brüggemann ; Kirsten Albracht
Background and Objective Effective leg extension training at a leg press requires high forces, which need to be controlled to avoid training-induced damage. In order to avoid high external knee adduction moments, which are one reason for unphysiological loadings on knee joint structures, both training movements and the whole reaction force vector need to be observed. In this study, the applicability of lateral and medial changes in foot orientation and position as possible manipulated variables to control external knee adduction moments is investigated. As secondary parameters both the medio-lateral position of the center of pressure and the frontal-plane orientation of the reaction force vector are analyzed. Methods Knee adduction moments are estimated using a dynamic model of the musculoskeletal system together with the measured reaction force vector and the motion of the subject by solving the inverse kinematic and dynamic problem. Six different foot conditions with varying positions and orientations of the foot in a static leg press are evaluated and compared to a neutral foot position. Results Both lateral and medial wedges under the foot and medial and lateral shifts of the foot can influence external knee adduction moments in the presented study with six healthy subjects. Different effects are observed with the varying conditions: the pose of the leg is changed and the direction and center of pressure of the reaction force vector is influenced. Each effect results in a different direction or center of pressure of the reaction force vector. Conclusions The results allow the conclusion that foot position and orientation can be used as manipulated variables in a control loop to actively control knee adduction moments in leg extension training.
Can exercise positively influence the intervertebral disc? (2016)
Daniel L. Belavy ; Kirsten Albracht ; Gert-Peter Bruggemann ; Pieter-Paul A. Vergroesen ; Jaap H. van Dieen
To better understand what kinds of sports and exercise could be beneficial for the intervertebral disc (IVD), we performed a review to synthesise the literature on IVD adaptation with loading and exercise. The state of the literature did not permit a systematic review; therefore, we performed a narrative review. The majority of the available data come from cell or whole-disc loading models and animal exercise models. However, some studies have examined the impact of specific sports on IVD degeneration in humans and acute exercise on disc size. Based on the data available in the literature, loading types that are likely beneficial to the IVD are dynamic, axial, at slow to moderate movement speeds, and of a magnitude experienced in walking and jogging. Static loading, torsional loading, flexion with compression, rapid loading, high-impact loading and explosive tasks are likely detrimental for the IVD. Reduced physical activity and disuse appear to be detrimental for the IVD. We also consider the impact of genetics and the likelihood of a ‘critical period’ for the effect of exercise in IVD development. The current review summarises the literature to increase awareness amongst exercise, rehabilitation and ergonomic professionals regarding IVD health and provides recommendations on future directions in research.
Influence of mechanical properties of the leg extensor muscletendon units on running economy (2010)
Kirsten Albracht
Robotergestütztes System für ein verbessertes neuromuskuläres Aufbautraining der Beinstrecker (2016)
Melanie Kolditz ; Thivaharan Albin ; Gert-Peter Brüggemann ; Dirk Abel ; Kirsten Albracht
Neuromuskuläres Aufbautraining der Beinstrecker ist ein wichtiger Bestandteil in der Rehabilitation und Prävention von Muskel-Skelett-Erkrankungen. Effektives Training erfordert hohe Muskelkräfte, die gleichzeitig hohe Belastungen von bereits geschädigten Strukturen bedeuten. Um trainingsinduzierte Schädigungen zu vermeiden, müssen diese Kräfte kontrolliert werden. Mit heutigen Trainingsgeräten können diese Ziele allerdings nicht erreicht werden. Für ein sicheres und effektives Training sollen durch den Einsatz der Robotik, Sensorik, eines Regelkreises sowie Muskel-Skelett-Modellen Belastungen am Zielgewebe direkt berechnet und kontrolliert werden. Auf Basis zweier Vorstudien zu möglichen Stellgrößen wird der Aufbau eines robotischen Systems vorgestellt, das sowohl für Forschungszwecke als auch zur Entwicklung neuartiger Trainingsgeräte verwendet werden kann.
Evaluation of an industrial robot as a leg press training device (2015)
Melanie Kolditz ; Kirsten Albracht ; Alessandro Fasse ; Thivaharan Albin ; Gert-Peter Brüggemann ; Dirk Abel
Simulative Analysis of Joint Loading During Leg Press Exercise for Control Applications (2015)
Melanie Kolditz ; Thivaharan Albin ; Alessandro Fasse ; Gert-Peter Brüggemann ; Dirk Abel ; Kirsten Albracht
Using the Hephaistos orthotic device to study countermeasure effectiveness of neuromuscular electrical stimulation and dietary lupin protein supplementation, a randomised controlled trial (2017)
Jochen Zange ; Kathrin Schopen ; Kirsten Albracht ; Darius A. Gerlach ; Petra Frings-Meuthen ; Nicola A. Maffiuletti ; Wilhelm Bloch ; Jörn Rittweger
Joint work of the take-off leg during elite high jump (2015)
Jan-Peter Goldmann ; Bjoern Braunstein ; Kai Heinrich ; Maximilian Sanno ; Benjamin Stäudle ; Wolfgang Ritzdorf ; Gert-Peter Brüggemann ; Kirsten Albracht
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