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  • 1
    In: Scientific Reports, Springer Science and Business Media LLC, Vol. 6, No. 1 ( 2016-03-09)
    Abstract: Early increased sophistication of human tools is thought to be underpinned by adaptive morphology for efficient tool manipulation. Such adaptive specialisation is unknown in nonhuman primates but may have evolved in the New Caledonian crow, which has sophisticated tool manufacture. The straightness of its bill, for example, may be adaptive for enhanced visually-directed use of tools. Here, we examine in detail the shape and internal structure of the New Caledonian crow’s bill using Principal Components Analysis and Computed Tomography within a comparative framework. We found that the bill has a combination of interrelated shape and structural features unique within Corvus and possibly birds generally. The upper mandible is relatively deep and short with a straight cutting edge and the lower mandible is strengthened and upturned. These novel combined attributes would be functional for (i) counteracting the unique loading patterns acting on the bill when manipulating tools, (ii) a strong precision grip to hold tools securely and (iii) enhanced visually-guided tool use. Our findings indicate that the New Caledonian crow’s innovative bill has been adapted for tool manipulation to at least some degree. Early increased sophistication of tools may require the co-evolution of morphology that provides improved manipulatory skills.
    Type of Medium: Online Resource
    ISSN: 2045-2322
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2016
    detail.hit.zdb_id: 2615211-3
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  • 2
    In: Sports, MDPI AG, Vol. 10, No. 2 ( 2022-01-31), p. 19-
    Abstract: Injuries to the shoulder are very common in sports that involve overhead arm or throwing movements. Strength training of the chest muscles has the potential to protect the shoulder from injury. Kinematic and kinetic data were acquired in 20 healthy subjects (age: 24.9 ± 2.7 years) using motion capture, force plates for the bench press exercises and load cells in the cable for the cable pulley exercises with 15% and 30% of body weight (BW). Joint ranges of motion (RoM) and joint moments at the shoulder, elbow and wrist were derived using an inverse dynamics approach. The maximum absolute moments at the shoulder joint were significantly larger for the cable pulley exercises than for the bench press exercises. The cable cross-over exercise resulted in substantially different joint angles and loading patterns compared to most other exercises, with higher fluctuations during the exercise cycle. The present results indicate that a combination of bench press and cable pulley exercises are best to train the full RoM and, thus, intra-muscular coordination across the upper limbs. Care has to be taken when performing cable cross-over exercises to ensure proper stabilisation of the joints during exercise execution and avoid joint overloading.
    Type of Medium: Online Resource
    ISSN: 2075-4663
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2704239-X
    SSG: 31
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  • 3
    In: Sports, MDPI AG, Vol. 11, No. 7 ( 2023-06-23), p. 125-
    Abstract: Velocity-based training (VBT) is a method to monitor resistance training based on measured kinematics. Often, measurement devices are too expensive for non-professional use. The purpose of this study was to determine the accuracy and precision of the Apple Watch 7 and the Enode Pro device for measuring mean, peak, and propulsive velocity during the free-weighted back squat (in comparison to Vicon as the criterion). Velocity parameters from Vicon optical motion capture and the Apple Watch were derived by processing the motion data in an automated Python workflow. For the mean velocity, the barbell-mounted Apple Watch (r = 0.971–0.979, SEE = 0.049), wrist-worn Apple Watch (r = 0.952–0.965, SEE = 0.064) and barbell-mounted Enode Pro (r = 0.959–0.971, SEE = 0.059) showed an equal level of validity. The barbell-mounted Apple Watch (Vpeak: r = 0.952–0.965, SEE = 0.092; Vprop: r = 0.973–0.981, SEE = 0.05) was found to be the most valid for assessing propulsive and peak lifting velocity. The present results on the validity of the Apple Watch are very promising, and may pave the way for the inclusion of VBT applications in mainstream consumer wearables.
    Type of Medium: Online Resource
    ISSN: 2075-4663
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2704239-X
    SSG: 31
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  • 4
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  • 5
    Online Resource
    Online Resource
    Hindawi Limited ; 2015
    In:  Computational and Mathematical Methods in Medicine Vol. 2015 ( 2015), p. 1-12
    In: Computational and Mathematical Methods in Medicine, Hindawi Limited, Vol. 2015 ( 2015), p. 1-12
    Abstract: Background . Knowledge of the musculoskeletal loading conditions during strength training is essential for performance monitoring, injury prevention, rehabilitation, and training design. However, measuring muscle forces during exercise performance as a primary determinant of training efficacy and safety has remained challenging. Methods . In this paper we review existing computational techniques to determine muscle forces in the lower limbs during strength exercises in vivo and discuss their potential for uptake into sports training and rehabilitation. Results . Muscle forces during exercise performance have almost exclusively been analysed using so-called forward dynamics simulations, inverse dynamics techniques, or alternative methods. Musculoskeletal models based on forward dynamics analyses have led to considerable new insights into muscular coordination, strength, and power during dynamic ballistic movement activities, resulting in, for example, improved techniques for optimal performance of the squat jump, while quasi-static inverse dynamics optimisation and EMG-driven modelling have helped to provide an understanding of low-speed exercises. Conclusion . The present review introduces the different computational techniques and outlines their advantages and disadvantages for the informed usage by nonexperts. With sufficient validation and widespread application, muscle force calculations during strength exercises in vivo are expected to provide biomechanically based evidence for clinicians and therapists to evaluate and improve training guidelines.
    Type of Medium: Online Resource
    ISSN: 1748-670X , 1748-6718
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2015
    detail.hit.zdb_id: 2256917-0
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  • 6
    Online Resource
    Online Resource
    Hindawi Limited ; 2019
    In:  Applied Bionics and Biomechanics Vol. 2019 ( 2019-02-17), p. 1-8
    In: Applied Bionics and Biomechanics, Hindawi Limited, Vol. 2019 ( 2019-02-17), p. 1-8
    Abstract: Challenges remain in accurately capturing the musculoskeletal geometry of individual subjects for clinical and biomechanical gait analysis. The aim of this study was to use and validate the Host Mesh Fitting (HMF) technique for fitting a generic anatomically based musculoskeletal model to 3D body surface data of individual subjects. The HMF technique is based on the free-form idea of deforming geometrically complex structures according to the deformation of a surrounding volumetric mesh. Using the HMF technique, an anatomically based model of the lower limbs of an adult female subject (29 years) was customized to subject-specific skin surface data of five typically developing children (mean age 10.2 years) and six children with Cerebral Palsy (CP) (mean age 9.6 years). The fitted lengths and volumes of six muscle-tendon structures were compared against measures from Magnetic Resonance (MR) images for validation purposes. The HMF technique resulted in accurate approximations of the lower limb shapes of all subjects in both study groups. The average error between the MR data and the fitted muscle-tendon lengths from HMF was 4 ± 4 % in children without CP and 7 ± 5 % in children with CP, respectively. The average error between the MR data and the fitted muscle volumes from HMF was 28 ± 19 % in children without CP and 27 ± 28 % in children with CP, respectively. This study presents a crucial step towards personalized musculoskeletal modelling for gait analysis by demonstrating the feasibility of fitting a generic anatomically based lower limb model to 3D body surface data of children with and without CP using the HMF technique. Additional improvements in the quality of fit are expected to be gained by developing age-matched generic models for different study groups, accounting for subject-specific variations in subcutaneous body fat, as well as considering supplementary data from ultrasound imaging to better capture physiological muscle tissue properties.
    Type of Medium: Online Resource
    ISSN: 1176-2322 , 1754-2103
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2019
    detail.hit.zdb_id: 2179924-6
    SSG: 12
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  • 7
    Online Resource
    Online Resource
    University of Bern ; 2023
    In:  Current Issues in Sport Science (CISS) Vol. 8, No. 2 ( 2023-02-14), p. 023-
    In: Current Issues in Sport Science (CISS), University of Bern, Vol. 8, No. 2 ( 2023-02-14), p. 023-
    Abstract: Introduction Strength training is a fairly popular topic, both among sports product users and among scientists in Switzerland and other countries around the world. Nevertheless, the analysis of the literature is indicating that there is not enough scientifically based research on gender-specific issues of strength training loads planning for female athletes in sports of higher achievements. Purpose The goal of this study was to identify gender-specific issues in the planning of strength training loads for elite female athletes based on the psychophysiological and biomechanical methods of controlling. Methods To determine the model characteristics of the optimal psychophysiological state (indicators of the efficiency of attention, volume of voluntary attention, productivity, coefficients of motivational, volitional and typological components, stress resistance) and balance function of elite male and female athletes during practising competitions, we compared two independent groups (women, n = 17 and men, n = 24). All participants were aware of the objectives of the study and agreed to participate. Mathematical and statistical processing and data analysis were carried out using the computing and graphic capabilities of the computer programs “Statistica” (Statsoft, version 7.0) and Microsoft Excel 2010. Results The analysed factors and their component indicators to determine the state of psychophysiological functions for women and men. The analysis of the obtained indicators indicates that the manifestation of the characteristics of psychophysiological functions for men and women has its own gender characteristics. For men, it is a predominance of attention, and for women, mobility and strength of nervous processes. As for the quality of the balance function, significantly higher indicators (p 〈 0,05) are observed for women precisely when performing an attempt with closed eyes. Conclusions The sexual peculiarities of the formation of psychophysiological functions of elite athletes, the functional peculiarities of psychomotor and mental activity, as well as the peculiarities of the psychophysiological organization of information processing were revealed. The nuances regarding the indicators of quality of the balance function among elite athletes, depending on gender, are revealed, which is primarily related to the location of the centres of gravity: in women, it is located in the hips, and in men, it is much higher. This will, for example, directly affect the difference in the recommended angle in the knee area for female and male athletes during the strength exercise “squat with a barbell”. In addition, we would like to note that the data of the studied literature sources and our previous studies allow us to formulate a hypothesis regarding the change in the speed of basic training in elite female athletes under the influence of hormonal changes in different phases of their menstrual cycle. This hypothesis will be further investigated in forthcoming research.
    Type of Medium: Online Resource
    ISSN: 2414-6641
    Language: Unknown
    Publisher: University of Bern
    Publication Date: 2023
    detail.hit.zdb_id: 2859600-6
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  • 8
    In: Sports, MDPI AG, Vol. 9, No. 9 ( 2021-08-27), p. 118-
    Abstract: The goal of this study was to assess the validity, reliability and accuracy of a smartwatch-based workout analysis application in exercise recognition, repetition count and One Repetition Maximum (1RM) prediction in the strength training-specific setting. Thirty recreationally trained athletes performed four consecutive sets of barbell deadlift, barbell bench press and barbell back squat exercises with increasing loads from 60% to 80% of their estimated 1RM with maximum lift velocity. Data was measured using an Apple Watch Sport and instantaneously analyzed using an iOS workout analysis application called StrengthControl. The accuracies in exercise recognition and repetition count, as well as the reliability in predicting 1RM, were statistically analyzed and compared. The correct strength exercise was recognised in 88.4% of all the performed sets (N = 363) with accurate repetition count for the barbell back squat (p = 0.68) and the barbell deadlift (p = 0.09); however, repetition count for the barbell bench press was poor (p = 0.01). Only 8.9% of attempts to predict 1RM using the StrengthControl app were successful, with failed attempts being due to technical difficulties and time lag in data transfer. Using data from a linear position transducer instead, significantly different 1RM estimates were obtained when analysing repetition to failure versus load-velocity relationships. The present results provide new perspectives on the applicability of smartwatch-based strength training monitoring to improve athlete performance.
    Type of Medium: Online Resource
    ISSN: 2075-4663
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2704239-X
    SSG: 31
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  • 9
    In: Bioengineering, MDPI AG, Vol. 10, No. 7 ( 2023-07-21), p. 865-
    Abstract: Identifying key criteria of squat performance is essential to avoiding injuries and optimizing strength training outcomes. To work towards this goal, this study aimed to assess the correlation between lower limb anatomy and back squat performance during a set-to-exhaustion in resistance-trained males and females. Optical motion captures of squat performance and data from magnetic resonance imaging (MRI) of the lower limbs were acquired in eight healthy participants (average: 28.4 years, four men, four women). It was hypothesized that there is a correlation between subject-specific musculoskeletal and squat-specific parameters. The results of our study indicate a high correlation between the summed volume of the hamstrings and quadriceps and squat depth normalized to thigh length (r = −0.86), and a high correlation between leg size and one-repetition maximum load (r = 0.81), respectively. Thereby, a marked difference was found in muscle volume and one-repetition maximum load between males and females, with a trend of females squatting deeper. The present study offers new insights for trainers and athletes for targeted musculoskeletal conditioning using the squat exercise. It can be inferred that greater muscle volume is essential to achieving enhanced power potential, and, consequently, a higher 1RM value, especially for female athletes that tend to squat deeper than their male counterparts.
    Type of Medium: Online Resource
    ISSN: 2306-5354
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2746191-9
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  • 10
    In: Sports Biomechanics, Informa UK Limited, Vol. 22, No. 6 ( 2023-06-03), p. 752-766
    Type of Medium: Online Resource
    ISSN: 1476-3141 , 1752-6116
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2023
    detail.hit.zdb_id: 2098824-2
    SSG: 31
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