Refine
Document Type
Is part of the Bibliography
- no (7)
Keywords
- AnyBody (1)
- Cervical spine (1)
- Football (1)
- Halswirbelsäule (1)
- Immobilisation (1)
- Immobilization (1)
- Mountain rescue (1)
- Notfallmedizin (1)
- Orthosis (1)
- Speedcourt (1)
Institute
- Fakultät Maschinenbau (7)
- Labor Biomechanik (LBM) (7)
- Research Center for Artificial Intelligence - RCAI (7)
- Research Center of Biomedical Engineering - RCBE (7)
- Research Center of Health Sciences and Technology - RCHST (7)
- Fakultät Angewandte Natur- und Kulturwissenschaften (1)
- Sensorik-Applikationszentrum (SappZ) (1)
Begutachtungsstatus
- peer-reviewed (4)
Football players have a high risk of leg muscle injuries, especially when exposed to mental stress. Injuries to muscles of the thigh are common in amateur and professional football, representing almost a third of all injuries. These injuries occur primarily in non-contact situations and from overuse. They can lead to a range of costs, including financial costs associated with treatment as well as those associated with long-term recovery, and absence from training and/or competition. Further, there is a high risk of injury recurrence and subsequent injury.
Evaluation of muscle recruitment and muscle models in musculoskeletal simulation of dynamic motion
(2021)
Musculoskeletal simulation plays an increasingly important role in sports biomechanics. In the last years, the field of application widened from orthopaedics and ergonomics to sports [1]. A muscle recruitment algorithm with a quadratic objective function is usually used to calculate muscle activity in dynamic movements. The agreement of calculated and measured thigh muscle activity has already been investigated [2]. They found a strong agreement for sprinting and running, while the correlation decreased for side-cutting manoeuvres. Nevertheless, the influence of different muscle recruitment criteria on muscle activity in dynamic musculoskeletal simulations is currently unknown. Hence, this study aimed to analyse the effect of different muscle recruitment criteria and muscle models on the correlation of numerical and measured muscle activity in highly dynamic movements.
Osteoporosis is a common disease of old age. However, in many cases, it can be very well prevented and counteracted with physical activity, especially high-impact exercises. Wearables have the potential to provide data that can help with continuous monitoring of patients during therapy phases or preventive exercise programs in everyday life. This study aimed to determine the accuracy and reliability of measured acceleration data at different body positions compared to accelerations at the pelvis during different jumping exercises. Accelerations at the hips have been investigated in previous studies with regard to osteoporosis prevention. Data were collected using an IMU-based motion capture system (Xsens) consisting of 17 sensors. Forty-nine subjects were included in this study. The analysis shows the correlation between impacts and the corresponding drop height, which are dependent on the respective exercise. Very high correlations (0.83–0.94) were found between accelerations at the pelvis and the other measured segments at the upper body. The foot sensors provided very weak correlations (0.20–0.27). Accelerations measured at the pelvis during jumping exercises can be tracked very well on the upper body and upper extremities, including locations where smart devices are typically worn, which gives possibilities for remote and continuous monitoring of programs.
Hintergrund:
Der tatsächliche Stellenwert der prähospitalen Immobilisation der
Halswirbelsäule (HWS) bei schwer verletzten Traumapatienten ist weiterhin unklar.
In Anbetracht möglicher negativer Implikationen durch das Anbringen einer starren
HWS-Orthese muss deren Anwendung während der gesamten prähospitalen Phase
kritisch hinterfragt werden.
Ziel der Arbeit:
Es sollten vergleichende biomechanische Messungen zur Beweglichkeit
der HWS bei Immobilisation mittels Vakuummatratze mit und ohne zusätzliches
Anbringen einer starren HWS-Orthese nach Lagerung auf der Trage durchgeführt
werden.
Material und Methoden:
Die Bewegungen der HWS beim Ein- und Ausladeprozess
in einen modernen RTW sowie während der Fahrt entlang eines vordefinierten
Parkours wurden mit einem Motion-Capture-System aufgezeichnet. Die Probandin,
an der die Messungen durchgeführt wurden, wurde auf einer Vakuummatratze mit
der Möglichkeit zur seitlichen Fixierung des Kopfes sowie Kinn- und Stirngurt auf
einer elektrohydraulischen Fahrtrage immobilisiert. Bei der einen Hälfte der Versuche
erfolgte die zusätzliche Immobilisation der HWS mittels starrer Orthese, bei der
anderen wurde auf die Anwendung einer HWS-Orthese verzichtet.
Ergebnisse:
Statistisch signifikante Unterschiede ergaben sich nur bei einigen
biomechanischen Parametern in der sagittalen Ebene (Flexion und Extension). Für
die anderen Bewegungsrichtungen (axiale Rotation, laterale Beugung) wurden keine
signifikanten Unterschiede für die gemessenen Parameter ermittelt. Generell wurden
sowohl bei den Versuchen mit HWS-Orthese als auch ohne HWS-Orthese nur sehr
geringe Winkelauslenkungen (im Mittel bei axialer Rotation und Flexion/Extension im
Bereich von einem bis 2 Grad, bei der lateralen Beugung höchstens 3 Grad) gemessen.
Schlussfolgerung: Bei einer korrekt durchgeführten Immobilisation mittels einer
Vakuummatratze mit der Möglichkeit zur seitlichen Stabilisierung des Kopfes sowie
Kinn- und Stirngurt auf einer elektrohydraulischen Fahrtrage mit Beladesystem
ergeben sich für den Ein- und Ausladeprozess sowie während der Fahrt in einem
modernen RTW mit luftgefederter Tragenlagerung und Luftfederung der Hinterachse
keine relevanten Vorteile bezüglich der Einschränkung der Bewegung der HWS durch
die zusätzliche Verwendung einer starren HWS-Orthese.
Background
Cervical spine injuries in alpine sports require immediate immobilization at the site of the accident to avoid possible secondary damage caused by transportation. Using special sensor technology, this study investigated whether a cervical spine orthosis (cervical collar, Stifneck collar (Laerdal Medical GmbH, Puchheim, Germany)) provides greater stability than a vacuum mattress alone.
Methods
Using one male test person, we simulated transporting a patient with a spinal injury in steep alpine terrain. A wireless motion capture system (Xsens Technologies, Movella™ Inc., Henderson, USA) was used to record motion in three-dimensional space within a standardized environment. All tests were performed on a set course by the Bavarian Mountain Rescue Service. The test person lay on a mountain rescue stretcher and was immobilized with a vacuum mattress, either with or without a cervical orthosis. The axes of cervical spine movements were analyzed separately.
Results
There were no significant differences between immobilization with and without a cervical orthosis with regard to lateral flexion (max. 3.7° compared to 3.0°) in the frontal plane and maximum excursion in flexion (max. 1.6° compared to 2.8°) or extension (max. -1.6° compared to -1.7°). There was significantly greater rotation movement around the craniocaudal axis without an orthosis (max. 2.4° compared to 1.3°).
Conclusion
During mountain rescues, the cervical spine can be immobilized without a rigid cervical spine orthosis. Future research should explore the fundamental benefits of cervical spine immobilization, while the findings of this work contribute to the safe care of patients by avoiding the disadvantages associated with rigid cervical orthoses.