Stefan Kratzenstein

Stefan Kratzenstein
Christian-Albrechts-Universität zu Kiel | CAU · Motion Laboratory of the Institute for Sport Science at University of Kiel, Germany

Dr. rer. medic.

About

14
Publications
2,786
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288
Citations
Citations since 2016
8 Research Items
191 Citations
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2016201720182019202020212022010203040
2016201720182019202020212022010203040

Publications

Publications (14)
Article
Full-text available
Für die systematische Optimierung von Bewegungsstrategien im Boardpaddeln be-darf es der Identifizierung relevanter Bewegungskriterien, die in der Regel in einem Bewegungsleitbild verankert sind. Solche existieren zwar in Form von Erfahrungsbe-richten und Einzelfallbeobachtungen, jedoch sollte eine Validierung dieser Kriterien mithilfe einer system...
Article
Full-text available
Background: In persons with Parkinson's disease (pwPD) any additional somatosensory or distractor interference can influence the posture. When deprivation of vision and dual-task are associated, the effect on biomechanical performance is less consistent. The aim of this study was to evaluate the role of the visual deprivation and a cognitive task o...
Article
Full-text available
In gymnastics, the final landing position represents a key determinant of safety and exercise quality. Previous findings on the biomechanics of landing indicated that knee flexion correlates strongly with ground reaction forces. However, it remains unclear how this relationship is affected by landing training. We conducted a randomized controlled s...
Article
Full-text available
Für das Erreichen von Höchstleistungen im Ausdauersport ist es wichtig zu verstehen, welche Fak-toren für den Abbruch einer Ausdauerbelastung verantwortlich sind. Bestehende Studien stellen hier Erklärungsansätze peripherer und zentraler Ermüdung gegenüber (Staiano et al., 2018, S. 23). Aus dieser Diskussion heraus wird in Anlehnung an die Studien...
Article
Full-text available
The few studies on muscle timing in hand cycling are difficult to classify in the motor skill acquirement due to their variety of methods and content. This study aims to replicate two existing studies and thus to extend and connect the current state of research concerning the muscle timing during synchronous pedalling. The activity on- and offset o...
Article
Normalization methods are used to minimize the influence of external disturbances in the analysis of myo-electrical signals. Whether these methods actually minimize the error or only relocate it has not been evaluated so far. This verification is only possible in comparison to constant discharge conditions. The aims of this study were (I) to compar...
Article
Full-text available
Introduction: Breast cancer is the most common cancer disease of women in industrialized countries. Neurotoxic chemotherapy drugs are known to harm peripheral nerves and cause a chemotherapy-induced peripheral neuropathy (CIPN). CIPN is one of the most common adverse events associated with Paclitaxel chemotherapy and may remain present long after...
Article
The aim of this study is to investigate the neuromuscular response of shoulder muscles at different attachment heights of a carrying system during arm movement. It was hypothesized that (1) different height adjustments lead to changes in muscle activity and (2) the shoulder horizontal provides a benchmark for the optimal attachment height of the sh...
Article
The accuracy and precision of quantifying musculoskeletal kinematics, and particularly determining the centre of rotation (CoR) at the hip joint, using skin marker based motion analysis is limited by soft tissue artefact (STA). We posed the question of whether the contribution of individual markers towards improving the precision of the functional...
Article
Functional methods present a promising approach for the identification of skeletal kinematics, but their accuracy is limited by soft tissue artifacts (STAs). We hypothesized that consideration of the nonuniform distribution of STAs across the segment can lead to a significant improvement in the determination of the center of rotation at the hip. Tw...
Article
The determination of an accurate centre of rotation (CoR) from skin markers is essential for the assessment of abnormal gait patterns in clinical gait analysis. Despite the many functional approaches to estimate CoRs, no non-invasive analytical determination of the error in the reconstructed joint location is currently available. The purpose of thi...
Article
Full-text available
The aim of this paper is to describe applications a nd limitations of 3D motion analysis in golfing. The fo llowing five golf-specific error sources were identified: Occlus ion of markers, high velocity of hands, club and ball, inaccuracies in the determination of body segment rotations, vibrations at impact, accumulation of high numbers of markers...

Questions

Questions (3)
Question
I'm currently dealing with questions regarding the ergonomics of grass trimmers.
The analyis of hand-arm vibration seems to be well investigated.
Did anybody looked at the grip strength or muscular activity while using such machines in order to quantify fatigue? Thanks for any input on that.
Question
I only found papers focusing on methodological aspects of EMG. I would like to get an overview in which fields of rehabilitation cycling + EMG is already used to assess treatment strategies. Thanks for any first aid.
Question
Looking for a start up to quantify the harmony between a carrying system (e.g. leaf blower) using acceleration sensors. In a first approach a attached a sensor to the sternum and a second sensor close to the centre of mass of the device. Both sonsor's coordinate systems have had teh same orientation. Analysis of the signals came up with questions such as "How can a improve the position of the sensors?" and " Which parameter is suitable for the assessment of a comfortable fit"? Thanks for any help.

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