Matthias Lochmann - Academia.edu (original) (raw)

Papers by Matthias Lochmann

Orthopaedic Journal of Sports Medicine, 2017

Background: In the running community, a forefoot strike (FFS) pattern is increasingly preferred c... more Background: In the running community, a forefoot strike (FFS) pattern is increasingly preferred compared with a rearfoot strike (RFS) pattern. However, it has not been fully understood which strike pattern may better reduce adverse joint forces within the different joints of the lower extremity. Purpose: To analyze the 3-dimensional (3D) stress pattern in the ankle, knee, and hip joint in runners with either a FFS or RFS pattern. Study Design: Descriptive laboratory study. Methods: In 22 runners (11 habitual rearfoot strikers, 11 habitual forefoot strikers), RFS and FFS patterns were compared at 3.0 m/s (6.7 mph) on a treadmill with integrated force plates and a 3D motion capture analysis system. This combined analysis allowed characterization of the 3D biomechanical forces differentiated for the ankle, knee, and hip joint. The maximum peak force (MPF) and maximum loading rate (LR) were determined in their 3 ordinal components: vertical, anterior-posterior (AP), and medial-lateral (...

Fragestellung: Neue operative und (teil-)konservative Ansätze in der Behandlung von vorderen Kreu... more Fragestellung: Neue operative und (teil-)konservative Ansätze in der Behandlung von vorderen Kreuzband (VKB) Rupturen erfordern eine möglichst präzise Diagnostik und Follow-Up Bildgebung. Ziel der Studie war es die Möglichkeiten einer vollständig dreidimensionalen (3D=isotrop)[for full text, please go to the a.m. URL]

Fragestellung: Ausdauerlaufsport ist aufgrund zahlreicher gesundheitsfördernder Aspekte eine der ... more Fragestellung: Ausdauerlaufsport ist aufgrund zahlreicher gesundheitsfördernder Aspekte eine der beliebtesten Einzelsportarten. Allerdings besteht beim sportlichen Laufen bei akuten oder chronisch-repetitiven Überlastungen ein erhöhtes Risiko für Gewebeschäden, die langfristig[zum vollständigen Text gelangen Sie über die oben angegebene URL]

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Investigative Ophthalmology & Visual Science, 2014

Frontiers in Behavioral Neuroscience, 2018

Decision-making is the process of selecting a logical choice from among the available options and... more Decision-making is the process of selecting a logical choice from among the available options and happens as a complex process in the human brain. It is based on information processing and cost-analysis; it involves psychological factors, specifically, emotions. In addition to cost factors personal preferences have significant influence on decision making. For marketing purposes, it is interesting to know how these emotions are related to product acquisition decision and how to improve these products according to the user's preferences. For our proof-of-concept study, we use magnetoand electro-encephalography (MEG, EEG) to evaluate the very early reactions in the brain related to the emotions. Recordings from these methods are comprehensive sources of information to investigate neural processes of the human brain with good spatial-and excellent temporal resolution. Those characteristics make these methods suitable to examine the neurologic process that gives origin to human behavior and specifically, decision making. Literature describes some neuronal correlates for individual preferences, like asymmetrical distribution of frequency specific activity in frontal and prefrontal areas, which are associated with emotional processing. Such correlates could be used to objectively evaluate the pleasantness of product appearance and branding (i.e., logo), thus avoiding subjective bias. This study evaluates the effects of different product features on brain activity and whether these methods could potentially be used for marketing and product design. We analyzed the influence of color and fit of sports shirts, as well as a brand logo on the brain activity, specifically in frontal asymmetric activation. Measurements were performed using MEG and EEG with 10 healthy subjects. Images of t-shirts with different characteristics were presented on a screen. We recorded the subjective evaluation by asking for a positive, negative or neutral rating. The results showed significantly different responses between positively and negatively rated shirts. While the influence of the presence of a logo was present in behavioral data, but not in the neurocognitive data, the influence of shirt fit and color could be reconstructed in both data sets. This method may enable evaluation of subjective product preference.

Restorative Neurology and Neuroscience, 2017

BACKGROUND Current studies revealed the importance of perceptual training for the treatment of am... more BACKGROUND Current studies revealed the importance of perceptual training for the treatment of amblyopia. To improve stereo vision on a higher level, visual tasks have to be completed within a limited time window like in repetitive visual function tests. "Processing time" as the reaction time in which the absence or presence of depth was identified correctly, is of better predictive value for perceiving the depth than the stereo threshold only. OBJECTIVE To examine the long-term effects of repetitive dynamic testing of stereopsis on processing time. METHODS 15 male soccer athletes (13.3±3.2 years) underwent twelve sessions of a 15 minutes repetitive dynamic stereovision training over a period of six weeks, presented on a polarized 3D-TV in a four-alternative forced choice setup. We measured the response time of correct identified visual tasks of 11, 22, 44, 55, 66, 77 and 88arcsecs disparity before, after six sessions, after twelve sessions and after six month without testing. As response time is the sum of stereo processing time plus the motor reaction time, we defined the difference between the response times at 11 and 88arcsecs as "stereo processing time at 11arcsecs". A Wilcoxon Signed Rank Test was conducted between the testing sessions to evaluate significant changes in response time and stereo processing time. RESULTS After six sessions the mean stereo processing time at 11arcsecs decreased significantly from 804.4 ms to 403.7 ms (Z = -2.499, p = 0.012). Six months after the last training the stereo processing time at 11arcsecs remained at the level of the last session. CONCLUSION Our results suggest that repetitive testing of stereovision is effective in improving processing time of stereoscopic tasks in young male athletes significantly long-term.

Gait & Posture, 2017

Laterally wedged insoles have been shown to be effective for the reduction of the knee adduction ... more Laterally wedged insoles have been shown to be effective for the reduction of the knee adduction moment and other biomechanical variables that are associated with the pathogenesis of knee osteoarthritis. However, inconclusive results such as adverse effects in individual subjects or even no group-wise wedge effects have been presented in different studies and it has been suggested to identify variables that potentially confound the wedge effect. The main objective of this study was the investigation of interaction effects of lateral wedges with walking speed, as different self-select speeds have mainly been used in previous studies. Twenty-two healthy subjects completed gait analysis trials on an instrumented treadmill. They walked in different speed conditions (0.9, 1.1, 1.3, 1.5 m/s) with a neutral and a laterally wedged insole. Kinematics were acquired using infrared cinematography with reflective markers attached to the lower body. From the stance phase we extracted biomechanical parameters that are associated with knee joint loading and osteoarthritis severity. No interaction effect of lateral wedges and speed was observed for most biomechanical parameters except for the ankle eversion range of motion. The main effects of wedges were reductions of the external knee adduction moment and of the knee adduction angular impulse. All biomechanical variables changed with increasing speed. Only the lateral offset of the center of pressure did not respond to wedge or to speed changes. Our results suggest that different self-selected speeds do not confound the effect of laterally wedged insoles.

Procedia Engineering, 2016

Advances in Intelligent Systems and Computing, 2015

Nowadays, many tracking systems in football provide positional data of players but only a few sys... more Nowadays, many tracking systems in football provide positional data of players but only a few systems provide reliable data of the ball. The tracking quality of many available systems suffers from high ball velocities up to 120 km/h and from the occlusion of both the players and the ball. Radio-based local positioning systems use sensors integrated in the ball and located on the players’ back or near the shoes to avoid such issues. However, a qualitative evaluation of the tracking precision of radio-based systems is often not available and to the best of our knowledge there are actually no studies that deal with the positional accuracy of ball tracking. In this paper we close this gap and use the RedFIR radio-based locating system together with a ball shooting machine to repeatedly simulate realistic situations with different velocities in an indoor environment. We compare the derived positions from high speed camera footage to the positions provided by the RedFIR system by means of root mean square error (RMSE) and Bland-Altman analysis. We found an overall positional RMSE of 12.5 cm for different ball velocities ranging from 45 to 61 km/h. There was a systematic bias of 11.5 cm between positions obtained by RedFIR and positions obtained by the high speed camera. Bland-Altman analysis showed 95 % limits of agreement of [21.1 cm, 1.9 cm]. Taking the ball diameter of 22 cm into account these results indicate that RedFIR is a valid tool for kinematic, tactical and time-motion analysis of ball movements in football.

Zu den gruppentaktischen Massnahmen zur Optimierung des Angriffsverhaltens gehoert die Blockbildu... more Zu den gruppentaktischen Massnahmen zur Optimierung des Angriffsverhaltens gehoert die Blockbildung bei Eckstoessen. Hieraus ergibt sich die Moeglichkeit einer kurzfristigen Ueberzahlsituation im gegnerischen Strafraum. Verf. erlaeutert das taktische Verhalten von Angreifern und Abwehrspielern, um die 'Lufthoheit' (= kurzfristige Ueberzahlsituation) zu realisieren. Beim methodischen Vorgehen zur Einfuehrung des Blocks empfiehlt Verf. folgende Schritte: 1. Erlaeutern des Gesamtvorgangs; 2. Demonstration, Erlaeuterung der wichtigsten Fehlerquellen; 3. Ueben des Blocks in Dreiergruppen; 4. Ueben in Vierergruppen; 5. Erarbeiten des zeitlich-raeumlichen Ablaufs der Wettkampfsituation. Zur Schulung dieser gruppentaktischen Massnahme sollen sowohl motivierende als auch wettkampforientierte Uebungsformen eingesetzt werden. Winter

Je praeziser die Flankentechnik ist, desto genauer wird das Ziel (ein bestimmter Raum vor dem geg... more Je praeziser die Flankentechnik ist, desto genauer wird das Ziel (ein bestimmter Raum vor dem gegnerischen Tor) angespielt werden koennen. Verf. erlaeutert, warum Flankentraining wettkampfgerecht unter diversen Gegenmassnahmen durchgefuehrt werden soll. Inhalt und Organisation einer Uebung werden ausfuehrlich beschrieben. -wi-

Neben der Frontkniebeuge mit schnellkräftigem Einsatz der vorderen Oberschenkelmuskulatur und der... more Neben der Frontkniebeuge mit schnellkräftigem Einsatz der vorderen Oberschenkelmuskulatur und der das Risiko einer Wirbelsäulenknickung reduzierenden Überkopfkniebeuge haben sich die Hackkniebeuge und die Unilateralkniebeuge in der Praxis des sportlichen Trainings besonders bewährt. Bei der Hackkniebeuge liegt die Unterstützungsfläche nicht senkrecht unter dem Schwerpunkt des Gesamtsystems. Dies bedeutet 1., dass sich die Belastungscharakteristik im Vergleich zu allen anderen Kniebeugeformen verändert und dass 2. die Ausführung der Hackkniebeuge an spezielle Geräte gebunden ist. Die Hackkniebeuge führt zu einer Verringerung der Lendenwirbelsäulen- und Hüftgelenkbelastung. Damit verbunden ist eine Erhöhung der Belastung der Oberschenkelmuskulatur und der Kniegelenke. Ein Patellaspitzensyndrom lässt sich vermeiden, wenn die Stützaufnahme über die Ferse stattfindet. Die Unilateralkniebeuge simuliert die einbeinige Kraftübertragung auf den Boden beim Lauf und Sprung. Das gegenüber beidbei

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ABSTRACT Mainz, Univ., Diss., 2003.

Hinsichtlich des Anteils am Umfang der Trainings kommt der Kniebeuge von allen Trainingsübungen d... more Hinsichtlich des Anteils am Umfang der Trainings kommt der Kniebeuge von allen Trainingsübungen die höchste Bedeutung zu. Die Palette der verschiedenen Ausführungsvarianten der Kniebeuge ist ebenfalls sehr umfangreich. So lassen sich durch die Kombination der Beugetiefe, der Art der Hantelposition sowie der Höhe der Geschwindigkeit 60 verschiedene Kniebeugevarianten ableiten. Die Veränderung dieser möglichen Ausführungsvarianten mit unterschiedlichen Hantellasten und Wiederholungszahlen führt zu einer weiteren Erhöhung der Zahl der Kniebeugenvarianten. In der Praxis des sportlichen Trainings haben sich einige Ausführungsvarianten jedoch besser bewährt als andere. Hierzu gehören die Frontkniebeuge mit schnellkräftigem Einsatz der vorderen Oberschenkelmuskulatur und die Überkopfkniebeuge, deren Anwendung, im Vergleich zur herkömmlichen Kniebeuge, mit einer erheblichen Reduzierung des Risikos einer Wirbelsäulenknickung einhergeht. Grundsätzlich gilt, dass der Trainingseffekt der Kniebeuge

Bei der Kopfballtechnik muss unterschieden werden: 1. Kopfbälle mit und ohne Absprung; 2. Kopfbäl... more Bei der Kopfballtechnik muss unterschieden werden: 1. Kopfbälle mit und ohne Absprung; 2. Kopfbälle mit ein- oder beidbeinigem Absprung; 3. einbeiniger Absprung mit dem linken oder rechten Bein; 4. beim Flugkopfball wird ebenfalls einbeinig oder beidbeinig abgesprungen und die Hände zur Landung aktiv mitbenutzt. Beim Erwerb und Training einer zielgerichteten Kopfballtechnik spielt die Ausrichtung der Stirnfläche zur Flugbahn eine wesentliche Rolle. Zu den biomechanischen Aspekten sind insbesondere zu zählen: 1. die Rotation des Kopfes während während der Kontaktphase des Balles; 2. der Spin (die Eigenrotation) des Balles vor und nach der Kontaktphase. Die Bedeutung der Eigenrotation des Balles bei seiner Flugbahn wird ausführlich beschrieben. Kolb

European Journal of Applied Physiology, 2010

Aim of this work was to examine the effects of decoupled two-legged cycling on (1) submaximal and... more Aim of this work was to examine the effects of decoupled two-legged cycling on (1) submaximal and maximal oxygen uptake, (2) power output at 4 mmol L(-1) blood lactate concentration, (3) mean and peak power output during high intensity cycling (30 s sprint) and (4) isometric and dynamic force production of the knee extensor and flexor muscles. 18 highly trained male competitive male cyclists and triathletes (age 24 ± 3 years; body height 179 ± 11 cm; body mass 78 ± 8 kg; peak oxygen uptake 5,070 ± 680 mL min(-1)) were equally randomized to exercise on a stationary cycle equipped either with decoupled or with traditional crank system. The intervention involved 1 h training sessions, 5 times per week for 6 weeks at a heart rate corresponding to 70% of VO(2peak). VO(2) at 100, 140, 180, 220 and 260 and power output at 4 mmol L(-1) blood lactate were determined during an incremental test. VO(2peak) was recorded during a ramp protocol. Mean and peak power output were assessed during a 30 s cycle sprint. The maximal voluntary isometric strength of the quadriceps and biceps femoris muscles was obtained using a training machine equipped with a force sensor. No differences were observed between the groups for changes in any variable (P = 0.15-0.90; effect size = 0.00-0.30). Our results demonstrate that a 6 week (30 sessions) training block using decoupled crank systems does not result in changes in any physiological or performance variables in highly trained competitive cyclists.