Percorrer por autor "Fonseca, Pedro"
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- 3D Analysis of the Initial and End Positions of an Active and Passive Prone Hip Extension Test and Its Correlation with Lower Limb Isokinetic Neuromuscular Function of College Students: A Pilot StudyPublication . Lumini, José; Hedirian, Benjamin; Fonseca, Pedro; Ribeiro, Andrea; Schneider, André; Monteiro, António M.; Vilas-Boas, João PauloManual therapists routinely evaluate changes in pain, movement, and function through clinical tests that support clinical reasoning. The Prone Hip Extension Test (PHET) is commonly used as a self-perturbation task to assess lumbopelvic control and hip motion patterns related to gait. Performing the PHET actively and passively may reveal how voluntary activation and passive structures influence joint kinematics and contribute to force production. This study aimed to compare active and passive PHET execution and investigate how initial (IP) and final hip positions (FP) correlate with lower-limb neuromuscular function. Methods: Seven healthy volunteers (24.3 ± 3.4 years; 173.1 ± 7.5 cm; 72.1 ± 9.5 kg) without musculoskeletal conditions participated. Hip kinematics were recorded using a 12-camera Qualisys Oqus system (200 Hz) with 22 reflective markers, processed in Qualisys Track Manager 2.13 and exported to Visual3D. Participants performed three PHET trials in both IP and FP, with mean angles considered for analysis. Knee isokinetic performance was assessed on a Biodex System 4 at 180◦/s and 300◦/s for flexion and extension. Results: Significant differences between active and passive PHET emerged in the FP for rotational movements bilaterally (p = 0.02) and in IP adduction/abduction for both hips (right p = 0.03; left p = 0.02). No side-to-side differences were observed. Passive FP of the right hip showed multiple significant correlations with isokinetic flexion and extension parameters at 180◦/s and 300◦/s, particularly with torque/body weight, acceleration and deceleration times, and agonist/antagonist ratios (ρ ranging from −0.86 to 0.90). Conclusions: Meaningful differences exist between active and passive PHET performance, especially in frontal-plane IP and rotational FP measures. Additionally, passive FP strongly correlates with several neuromuscular variables, suggesting that PHET kinematics may reflect lower-limb isokinetic function.
- Analyzing Breathing Patterns in the Breaststroke Technique Through Dual-Media Kinematics and Fractal DimensionPublication . Alves, Miriam; Fonseca, Pedro; Fernandes, Aléxia; Brito, André V.; Barbosa, Tiago M.; Vilas-Boas, João PauloThe most hydrodynamic swimming position occurs with the head submerged, highlighting the benefit of reduced breathing frequency for efficiency. This study aimed to characterize and compare kinematics between two breaststroke breathing patterns—breathing every cycle and breathing every two cycles—while also analyzing intra-cyclic velocity variation (dv) and fractal dimension. In the breathing every cycle pattern, each cycle included a breath. In the breathing every cycle pattern, swimmers breathed once per cycle. In the breathing every two cycles pattern, breathing occurred every second cycle, resulting in three types of cycles: breathing, non-breathing, and the breathing cycle following a non-breathing cycle. To ensure familiarity with the new breathing pattern, swimmers underwent a six-week intervention program. They then performed three maximal 25 m bouts in each breathing pattern. Kinematic data were collected using a dual-media optoelectronic system (Qualisys AB, Sweden), integrating underwater and dry-land camera recordings. The results showed minimal differences between the three cycle types. The non-breathing cycle had the shallowest and deepest head positions, the lowest horizontal head amplitude out of water, and the smallest vertical head amplitude. It also had the fastest maximum vertical velocity of the feet and maximum center of mass velocity in the swimming direction.
- Welcome messagePublication . Lopes, Ana Cristina; Pires, Gabriel; Pinto, Vítor H.; Lima, José; Fonseca, PedroWelcome to the 2023 IEEE International Conference on Autonomous Robot Systems and Competitions (ICARSC). ICARSC is an international scientific meeting in the field of Mobile Robotics financially co-sponsored by the Portuguese Robotics Society, IEEE Portugal Section and IEEE Portugal RAS Chapter and technically co-sponsored by the IEEE Robotics and Automation Society (RAS). ICARSC is currently a recognized international scientific conference in the field of autonomous robotics and competitions. This conference is promoted by Instituto Politécnico de Tomar and the Portuguese Society of Robotics, with the support from Tomar Municipality. Thank you all for participating in this conference. We hope you feel it as a highly productive and sociable event and that you will enjoy your staying in Tomar.