Gerda Strutzenberger

Private University for Health Sciences, Medical Informatics and Technology GmbH | UMIT · Research Unit for Orthopaediic Sports Medicine and Injury Prevention

Der Gang stellt eine der wichtigsten funktionellen Bewegungsformen des täglichen Lebens dar, da er die Fortbewegung des Körpers ermöglicht. Funktionelle Defizite des aktiven und passiven Bewegungsapparates können mit Hilfe der Ganganalyse aufgezeigt werden. Dieser Beitrag ist Teil der Sektion Sportbiomechanik, herausgegeben vom Teilherausgeber Herm...

Der Gang stellt eine der wichtigsten funktionellen Bewegungsformen des täglichen Lebens dar, da er die Fortbewegung des Körpers ermöglicht. Funktionelle Defizite des aktiven und passiven Bewegungsapparates können mit Hilfe der Ganganalyse aufgezeigt werden. Dieser Beitrag ist Teil der Sektion Sportbiomechanik, herausgegeben vom Teilherausgeber Herm...

In injury prevention, a vertical drop jump (DJ) is often used for screening athletes at risk for injury; however, the large variation in individual movement patterns might mask potentially relevant strategies when analysed on a group-based level. Two movement strategies are commonly discussed as predisposing athletes to ACL injuries: a deficient le...

A simple and accurate method of determining foot strike angle (FSA) during running can simplify data collections and validations of wearable sensors. The purpose of this study was to determine the validity of two simplified methods for estimating FSA and foot angle (throughout the ground contact) from three-dimensional kinematics. Markers were plac...

Strutzenberger G, Zehnder L, Borcard LM, Scherr J, Spörri J. Are Thigh Muscle Activation Patterns During Drop Jumps Dependent on Sex and Fatigue? A Pilot Study in Competitive Soccer Players. ISBS Proceedings Archive. 2022

Various tests are available to assess athletes for factors associated with their susceptibility and risk of anterior cruciate ligament (ACL) injury or reinjury; however, it is unclear which tests are clinically meaningful and what should be considered when using them. Therefore, the aim of this scoping review was to screen and summarize testing and...

In competitive alpine skiing, a superior antirotation and rear-chain stabilization capacity is essential to constantly remain in dynamic equilibrium while skiing and to counteract the ski-specific adverse loading patterns of the back. As such, skiers’ trunk stabilization performance during deadbug bridging (DBB) exercises has been shown to be assoc...

Background Inclined treadmills or static ramp constructions can be used to investigate downhill gait in a standardised laboratory condition. There is a lack of information how the gait patterns are affected when walking on a ramp or an inclined treadmill during uphill and downhill walking. Research question Is there a difference in temporo-spatial...

The purpose of this study was to compare the performance of a video-based markerless motion capture system to a conventional marker-based approach during a counter movement jump (CMJ). Twenty-three healthy participants performed CMJ while data was collected simultaneously via a marker-based (Oqus) and a 2D video-based motion capture system (Miqus,...

Background: Ankle-foot and knee components are important determinants of mobility for individuals with transfemoral amputation. Individually, advanced ankle-foot and knee components have been shown to benefit mobility in this group of people. However, it is not clear what effect a variety of combinations of ankle-foot and knee components have on m...

The purpose of the current study was to evaluate the ecological validity of two previously developed laboratory-based random forest machine learning models and train two new ecologically valid models for the 1) prediction of foot strike angle (FSA) and 2) classification of foot strike pattern (FSP) from wearable insoles during running. The original...

Recent studies have developed wearable sensor systems to detect, classify and evaluate performance during alpine skiing. In order to enrich skiing data to provide motion quality feedback, edge angle (EA) and radial force (Fr) are parameters of interest. However, the estimation of these parameters via calibration free wearable technologies has not b...

This is the first kinematic investigation of articulator motion in Austrian Sign Language, which connects kinesiology of sign production and linguistic markers of Aktionsart in the native language of the Deaf1 community in Austria. Our work used a 3D motion capture approach to sign language analysis to investigate the relationship between the seman...

Spatiotemporal parameters can characterize the gait patterns of individuals, allowing assessment of their health status and detection of clinically meaningful changes in their gait. Video-based markerless motion capture is a user-friendly, inexpensive, and widely applicable technology that could reduce the barriers to measuring spatiotemporal gait...

Background Gait initiation in level walking is suggested to take three steps before reaching steady-state walking speed. In sloped gait, it is not clear if the general recommendation of level gait can be used. Research question The aim of this study was to investigate (1) if steady-state walking speed is reached within four steps in sloped gait, a...

Artificial turf (AT) is common at all levels of soccer and rugby. Employing an interdisciplinary design, this study aimed to examine the extent to which the negative attitude commonly expressed by players concerning AT is based on the difference in technique between AT and natural turf (NT), or due to pre-existing biases. Thirty professional soccer...

Spatiotemporal parameters can characterize the gait patterns of individuals, allowing assessment of their health status and detection of clinically meaningful changes in their gait. Video-based markerless motion capture is a user-friendly, inexpensive, and widely applicable technology that could reduce the barriers to measuring spatiotemporal gait...

Introduction: To avoid collapsing of the prosthetic knee during loading some prostheses contain a yielding mechanism, which can also be used for a safe downhill gait. The aim of this case study was to investigate; 1) the influence of downhill gradient on the utilization of yielding mechanisms during gait in individuals with UTA, 2) whether the yiel...

Inclined treadmills or static ramp constructions can be used to investigate downhill gait in a standardised laboratory condition. However, it is not clear how the different systems affect the gait pattern during downhill walking. Therefore temporo-spatial (Qualisys) and kinetic data (loadsol®) of 13 healthy participants walking with a given speed (...

For patients with knee osteoarthritis (KOA) downhill gait is often associated with pain. Therefore, the isometric muscle strength and gait biomechanics of 10 patients with moderate KOA was analysed during 4 different inclines and compared to a healthy control group (n=7). Patients with KOA showed significantly decreased peak knee joint moments duri...

Laboratory assessments of alpine ski tasks have the potential to be an effective initial investigation method prior to more intensive on-snow testing. Research questions involving acute changes elicited by sport-essential equipment would be an ideal application for such investigations. The purpose of the current study was to determine the reliabili...

Inclined treadmills or static ramp constructions can be used to investigate downhill gait in a standardised laboratory condition. However, it is not clear how the different systems affect the gait pattern during downhill walking. Therefore temporo-spatial (Qualisys) and kinetic data (loadsol®) of 13 healthy participants walking with a given speed (...

The aim of the study was to determine if sex differences exist in the key elbow and wrist joint injury risk factors during different cartwheel (CW) and round-off (RO) techniques performed by young male and female artistic gymnasts. Sixteen active young gymnasts (8 males and 8 females) performed 30 successful trials of CW and RO with three different...

Most ski boot-binding complexes have a positive ramp angle. This angle is not regulated or reported in the alpine ski industry, but may influence skier balance and pressure control. Therefore joint coordination during a dynamic ski squat task with increasing boot ramp angle (0°, 1°, 2°) in alpine skiers (n=19) was investigated. Average joint coupli...

Background: An inverted pendulum model represents the mechanical function of able-bodied individuals walking accurately, with centre of mass height and forward velocity data plotting as sinusoidal curves, 180° out of phase. Objectives: This study investigated whether the inverted pendulum model represented level gait in individuals with a unilat...

Introduction Prosthetic ankle-foot devices incorporating a hydraulic articulation between the pylon and prosthetic foot have been shown to be beneficial to the gait of more active individuals with unilateral transtibial amputation (UTA). However, the functional benefits of using hydraulic ankle-foot devices to less active individuals with UTA are y...

Biophysical loading of the elbow and wrist is a potential reason for chronic lesions in gymnastics and present a real concern for coaches, scientist and clinicians. Previous research has identified injury risk factors during round-off (RO) skills in elite female gymnasts. The aim of this study was to investigate key elbow and wrist joint injury ris...

Purpose: In the sprint events, the first two steps are used to accelerate the center of mass horizontally and vertically. Amputee athletes cannot actively generate energy with their running specific prosthesis. It is likely that sprint acceleration mechanics, including step asymmetry, are altered compared to able-bodied athletes. Therefore, the ai...

Background: Recent data have opened the debate on whether conservative treatment of anterior cruciate ligament (ACL) rupture might be an alternative treatment option to surgery. In a previous study, such a conservative treatment, i.e. 'Regenerative Therapy According to Mohammed Khalifa' (RegentK), had shown good effects over physiotherapy. Method...

Therapeutic climbing currently has high popularity in treating glenohumeral instability. Therefore, the aim of this study was to quantify the muscular activation of the middle and upper trapezius (MT, UT) and serratus anterior (SA) of four quasi-static climbing positions (Jug, Undercling, Sidepull with external and with internal rotation) of 15 par...

Introduction: Functional characteristics of prosthetic ankle design may facilitate sloped walking for individuals with transfemoral (TF) amputation. The aim of the current case study was to analyze the effects of a rigid versus a hydraulically articulating ankle component on the biological joint moments of an individual with TF amputation during do...

The aim of the study was to quantify the activation of arm and shoulder muscles during a static therapeutic climbing exercise and to investigate the possibility of altering the muscle activation through arm position (Jug, Undercling, Sidepull internal rotated, Sidepull external rotated), hand support (one-handed, double-handed) and wall inclination...

Zusammenfassung REHA AN DER KLETTERWAND Therapeutisches Klettern wird zunehmend in der Behandlung von orthopädisch-traumatischen Erkrankungen eingesetzt. Allerdings liegen nur wenige wissenschaftliche Erkenntnisse über die Wirkungsweise dieser Behandlungsmethode vor. Die vorliegende Studie liefert erstmals Daten über die Aktivierung der Arm- und Sc...

Work performance and individual joint contribution to total work are important information for creating training protocols, but were not assessed so far for sloped walking. Therefore, the purpose of this study was to analyze lower limb joint work and joint contribution of the hip, knee and ankle to total lower limb work during sloped walking in a h...

To facilitate downhill walking in transfemoral amputees, some prostheses contain knee joints that have a yielding mechanism. The aim of this case study was to investigate 1) at which gradient unilateral transfemoral (UTF) amputees first utilised the yielding mechanism, 2) whether this mechanism is linked to altered spatio-temporal parameters and 3)...

Presentation of 1 year follow-up results after RegentK treatments.

Background: The purpose of this study was to investigate the immediate response to RegentK (Regeneration-Therapy by Khalifa) of patients with an acute rupture of the anterior cruciate ligament (ACL), regarding the gait mechanics and functional tests, in comparison to norm data. Patients and methods: 9 male patients with an acute unilateral ACL r...

The number of obesity prevalence in adolescents is still increasing. Obesity treatment programs typically include physical activity with walking being recommended as appropriate activity, but limited information exists on the demand uphill walking places on the joint loading and power of obese adolescents. Therefore, the purpose of this study was t...

The purpose of this study was to explore the relationship between the forces applied to the starting blocks and the start performances (SPs) of amputee sprinters (ASs) and non-amputee sprinters (NASs). SPs of 154 male and female NASs (100-m personal records [PRs], 9.58–14.00 s) and 7 male ASs (3 unilateral above knee, 3 unilateral below knee, 1 bil...

The aim of this study was to investigate 1st and 2nd stance phase spatio-temporal and ground reaction force (GRF) parameters of four unilateral transtibial amputee (AMP) and nine able-bodied (AB) sprinters. Data were collected using a 3D motion capture system (Vicon, 250 Hz) and two force plates (Kistler 1000 Hz). Aside from flight time (d=0.32) an...

Kinesio-tape® has been suggested to increase blood circulation and lymph flow and might influence the muscle's ability to maintain strength during fatigue. Therefore, the aim of this study was to investigate the influence of gluteal Kinesio-tape® on lower limb muscle strength in non-fatigued and fatigued conditions. A total of 10 male rugby union p...

The purpose of this study was to investigate an IMU system (GaitUp) with respect to validity in normal and induced impaired walking by comparing with a state-of-the-art 3D motion capture system. The gait of nine participants was analysed collecting data simultaneously with the GaitUp (Physiolog) placed at each foot and an eight camera motion captur...

The purpose of this study was to observe relationships between reaction forces measured with an instrumented force starting block, start performance (normalized average horizontal block power) and 100 m personal record times in 142 male and female able-bodied sprinters. Further, start kinetics of 7 amputee sprinters and able-bodied sprinters of sim...

The purpose of this study was to analyse the acute effects of the manual therapy RegentK on tibiofemoral joint forces and lower limb muscle forces in patients with an acute unilateral ACL rupture. Eight patients with an acute ACL rupture were recruited. Tibiofemoral joint forces and quadriceps, hamstring and gastrocnemius muscle forces were analyse...

The purpose of this study was to determine the accuracy of a newly developed pedal system (JA:Ped3) for measuring three-dimensional pedal forces in laboratory conditions in cycling. Three-dimensional force measurements were obtained using 12 strain gauges in each pedal, and the pedal angle was measured with a rotary potentiometer mounted on the ped...

Purpose: The purpose of this study was to investigate effects of a novel leaf spring midsole construction on biomechanical variables affecting running economy. The midsole construction is designed to exploit the directionality of the ground reaction force to shift the shoe anteriorly during the stance phase in running.Methods: Nine male long-distan...

Purpose The globalisation of artificial turf and the increase in player participation has driven the need to examine injury risk in the sport of football. The purpose of this study was to investigate the surface-player interaction in female football players between natural and artificial turf. Methods Eight university level female football players...

Non-circular chainrings theoretically enhance cycling performance by increasing effective chainring diameter and varying crank velocity, but research has failed to consistently reproduce the benefits in cycling trials. The aim of this study was (1) to investigate the effect of different chainring shapes on sagittal knee joint moment and sagittal lo...

Abstract The aim of this study was to investigate counter-movement jump performance and its reliability in children and adolescents with respect to age, sex and activity level. We tested 1835 children and adolescents aged between 4 and 17 years. All participants performed three counter-movement jumps on a force platform with arms akimbo. The partic...

Different designs of functional knee braces for ACL-injury rehabilitation exist. In addition to the mechanical stabilization provided by rigid shell braces, sleeve braces also address proprioceptive mechanisms, but little is known if this leads to benefits for ACL-deficient subjects. Therefore the aim of this study was to investigate the effect of...

Non-circular chainrings theoretically enhance cycling performance by increasing effective chainring diameter and varying crank velocity. Yet, scientific proof has failed to consistently reproduce the theoretical benefits in cycling trials. Therefore, the aim of this study was to analyse kinematics and kinetics between circular and two different sha...