| 1. |
- Koska, Daniel, 1986, et al.
(författare)
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Validation of an inertial measurement unit for the quantification of rearfoot kinematics during running
- 2018
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Ingår i: Gait & Posture. - : Elsevier BV. - 0966-6362. ; 64, s. 135-140
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Tidskriftsartikel (refereegranskat)abstract
- Background: The popular protocol used to study running motion suffers from problems that lead to a limited ability to generalize the obtained results. Inertial measurement units (IMU) appear to be promising in increasing ecological validity of the collected data. However, quantifying running kinematics utilizing IMU signals is complex and potentially affected by several well-established and less well-known errors. Research question: The purpose of this study was to examine the validity of kinematic variables obtained from a single, shoe-mounted IMU using an opto-electronic motion analysis reference system. Methods: 51 recreational runners were analyzed, performing a single continuous run at three different speeds (10, 12, 15 km/h) on a treadmill. Descriptive statistics (Bland & Altman analysis, box plots, scatter plots) were employed to analyze the agreement between the two instruments. Results: The findings of this study revealed considerable systematic and large random disagreement, which, in turn, is characterized by substantial inter-individual differences in the error distribution. These discrepancies may partly be explained by differences in foot strike behavior, resulting in varying degrees of vibration impact acting on the IMU. Significance: Advances in IMU technology, as well as exploring new application approaches and signal processing strategies, might enhance the usability of IMUs in analyzing running kinematics.
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| 2. |
- Lückemann, Paul, et al.
(författare)
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Validation of an Inertial Sensor System for Swing Analysis in Golf
- 2018
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Ingår i: Proceedings. - Basel Switzerland : MDPI. - 0351-6067. ; 246:2, s. 1-6
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Tidskriftsartikel (refereegranskat)abstract
- Wearable inertial sensor systems are an upcoming tool for self-evaluation in sports, and can be used for swing analysis in golf. The aim of this work was to determine the validity and repeatability of an inertial sensor system attached to a player’s glove using a radar system as a reference. 20 subjects performed five full swings with each of three different clubs (wood, 7-iron, wedge). Clubhead speed was measured simultaneously by both sensor systems. Limits of Agreement were used to determine the accuracy and precision of the inertial sensor system. Results show that the inertial sensor system is quite accurate but with a lack of precision. Random error was quantified to approximately 12%. The measurement error was dependent on the club type and was weakly negatively correlated to the magnitude of clubhead speed.
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| 3. |
- Lösch, Christiane, et al.
(författare)
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Visuelle Bewegungskontrolle geführter Kraftübungen bei jungen Erwachsenen und Senioren
- 2018
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Ingår i: German Journal of Exercise and Sport Research. - : Springer Science and Business Media LLC. - 2509-3142 .- 2509-3150. ; 48:3, s. 428-437
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Tidskriftsartikel (refereegranskat)abstract
- Visuelle Bewegungskontrolle (Feedback) kann im Rahmen des rehabilitativen Krafttrainings unterstützend wirken, um eine korrekte Bewegungsausführung zu gewährleisten. Allerdings liegen speziell zum Krafttraining kaum Studien zur Effektivität visueller Bewegungskontrolle vor. Um den Effekt eines visuellen Feedbacks während einer geführten Kraftübung (Schulterdrücken) zu untersuchen, wurden 18 junge Probanden (28,8± 5,5 Jahre) und 12 Senioren (67,9± 4,1 Jahre) getestet. Die Probanden führten am Kraftgerät die Übung Schulterdrücken (3 Sätze, 15 Wiederholungen) randomisiert mit und ohne visuelle Bewegungskontrolle durch. Am Messtag 1 trainierten die Probanden ohne Trainingsgewicht, am Messtag 2 mit 50% des Ein-Wiederholungsmaximums (1RM). Die Gelenkwinkelverläufe von Ellenbogenextension und -flexion wurden erfasst. Anschließend erfolgtemittels Autokorrelation die Bestimmung der Reproduzierbarkeit des Bewegungsablaufes.Mit Feedback erzielten die Probanden eine signifikant bessere Reproduzierbarkeit der Bewegung als ohne (χ2= 19,73; p< 0,001). Die Gewichtsbelastung zeigte keinen Effekt auf die Bewegungsgenauigkeit (p> 0,05). Die Altersgruppe der Probanden zeigte einen signifikanten Effekt (χ2= 6,00; p= 0,014), welcher eine höhere Bewegungsgenauigkeit der jüngeren Probandengruppe abbildet. Es konnte gezeigt werden, dass die visuelle Bewegungskontrolle bei geführten Kraftbelastungen geeignet ist, die Bewegungsausführung zu kontrollieren. In klinischen Settings kann dies eine Möglichkeit darstellen, die Bewegungsausführung bei geführten Kräftigungsübungen zu steuern und eine gezielte Muskelarbeit sicherzustellen. Zukünftige Untersuchungen sollen klären, ob ein visuelles Feedback bei freien Übungen Auswirkungen auf die Bewegungsqualität hat.
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| 4. |
- Maiwald, Christian, 1975, et al.
(författare)
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Alterations of plantar pressure patterns and foot shape after long distance military marching
- 2018
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Ingår i: Footwear Science. - : Informa UK Limited. - 1942-4280 .- 1942-4299. ; 10:3, s. 203-213
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Tidskriftsartikel (refereegranskat)abstract
- Long-distance road marching including load carriage results in substantial biomechanical loading of the lower extremity of soldiers and is considered a risk factor for the development of lower extremity injury in military personnel. The aim of our study was to quantify changes in biomechanical loading and foot shape occuring after a typical marching task, to compare these data to similar effects already known from endurance running tasks, and to derive recommendations for the design of military footwear. Gait and foot shape of 59 soldiers were assessed using plantar pressure distribution and 3D foot scan measurements pre and post a 25 km road march carrying an 18 kg backpack. Plantar pressure variables indicated a load shift from toes to metatarsal heads II-V after the march, however, none of the foot measures showed any relevant changes. Results are partially consistent with existing findings and point to the need for military footwear design to address the load increase in the area of the lateral metatarsal heads to contribute to injury prevention.
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