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Browsing by Issue Date, starting with "2023-09-26"

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  • A Diagonal Movement Pattern of Arm Elevation and Depression in Overhead Throwing Athletes: An Exploratory Kinematic Analysis for Clinical Application
    Publication . Morais, Nuno; Ferreira, Joana; Gordo, Jéssica; Vilas-Boas, J. Paulo; Pascoal, Augusto Gil
    Assessing scapular position and motion during functional arm movement patterns may add relevant information to the evaluation of the clinical status and athletic performance of overhead sports athletes’ shoulders. This study aimed to examine the three-dimensional scapular kinematics of elite volleyball players with (n = 11) and without scapular dyskinesis (n = 11) in comparison to non-athletes (n = 27). Four distinct arm elevation/depression tasks were assessed: shoulder abduction/adduction, flexion/extension, scaption, and a diagonal movement pattern mimicking throwing (proprioceptive neuromuscular facilitation diagonal 2 for flexion/extension or PNF–D2– flx/ext). Kinematic data was recorded from the spiking/dominant shoulder using an electromagnetic system (FASTRAK, Polhemus Inc., Colchester, VT, USA); MotionMonitor v9 software, Innovative Sports Training, Inc., Chicago, IL, USA). The study compared scapular rotations at 15◦ intervals of humero-thoracic (HT) angles, ranging from minimum to 120◦. Significantly different 3D scapular kinematics were observed between traditional arm motion tasks and PNF–D2 arm motion task (HT angle × task interaction effect, p < 0.001, 0.275 ≤ η2p ≤ 0.772). However, when considering the combined influence of phase, HT angle, task, and group factors, no differences were found between groups (phase × HT angle × task × group, p ≥ 0.161, 0.032 ≤ η2p ≤ 0.058). The inclusion of a functional arm movement pattern when evaluating scapular position and movement in overhead athletes does not appear to be mandatory. However, these findings are preliminary and highlight the need for more research in this area.
    2023-09-26Journal article Open access Show more
  • Examining the Role of Perceived Source Credibility on Social Media Influencer’s Ascribed Opinion Leadership
    Publication . Crespo, Cátia Fernandes; Tille, Melanie
    Building on the theoretical framework of the source credibility model, this study aims to investigate how the different dimensions of social media influencer’s (SMI) perceived source credibility, respectively expertise, attractiveness, and trustworthiness impact on influencers’ ascribed opinion leadership, and ultimately affect social media users’ purchase intentions. A cross-cultural analysis focused on the German and Portuguese markets of Instagram users was implemented. Data were collected with an online survey distributed in Germany and Portugal, resulting in a sample of 467 participants, 214 from Germany and 253 from Portugal. Data were analyzed using structural equation modeling with partial least squares (PLS-SEM). Findings confirmed that expertise and attractiveness enhance the influencer’s ascribed opinion leadership. On the contrary, trustworthiness does not influence ascribed opinion leadership. The influencer’s ascribed opinion leadership promotes purchase intention. This study advances influencer marketing literature by deepening our understanding on the influence of online opinion leaders on social media user’s behavioral intentions.
    2023-09-26Journal article Restricted access Show more