Percorrer por autor "Campos, Pedro"
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- 23 ways to nudge: a review of technology-mediated nudging in human-computer interactionPublication . Caraban, Ana; Karapanos, Evangelos; Gonçalves, Daniel; Campos, PedroTen years ago, Thaler and Sunstein introduced the notion of nudging to talk about how subtle changes in the ‘choice archi tecture’ can alter people's behaviors in predictable ways. This idea was eagerly adopted in HCI and applied in multiple con texts, including health, sustainability and privacy. Despite this, we still lack an understanding of how to design effective technology-mediated nudges. In this paper we present a sys tematic review of the use of nudging in HCI research with the goal of laying out the design space of technology-mediated nudging –the why (i.e., which cognitive biases do nudges combat) and the how (i.e., what exact mechanisms do nudges employ to incur behavior change). All in all, we found 23 distinct mechanisms of nudging, grouped in 6 categories, and leveraging 15 different cognitive biases. We present these as a framework for technology-mediated nudging, and discuss the factors shaping nudges’ effectiveness and their ethical implications.
- Abalearn: a risk-sensitive approach to self-play learning in AbalonePublication . Campos, Pedro; Langlois, ThibaultThis paper presents Abalearn, a self-teaching Abalone pro gram capable of automatically reaching an intermediate level of play without needing expert-labeled training examples, deep searches or ex posure to competent play. Our approach is based on a reinforcement learning algorithm that is risk seeking, since defensive players in Abalone tend to never end a game. We show that it is the risk-sensitivity that allows a successful self-play training. We also propose a set of features that seem relevant for achiev ing a good level of play. We evaluate our approach using a fixed heuristic opponent as a bench mark, pitting our agents against human players online and comparing samples of our agents at different times of training.
- Analyzing the effects of competitive fatigue on body composition and functional capacities of youth elite handball playersPublication . Martins, Francisco; França, Cíntia; Sarmento, Hugo; Przednowek, Krzysztof; Śliż, Maciej; Campos, Pedro; Lopes, Helder; Marques, Adilson; Gouveia, Élvio Rúbio; Pestana Martins, João Francisco; França, Cíntia; Sarmento, Hugo; Pereira Campos, Pedro Filipe; Lopes, Helder; Marques, Adilson; Gouveia, Élvio RúbioHandball demands intense movements like rapid direction changes and physical contact. Consecutive competitions expose player fatigue and weaknesses due to the sport’s exhaustive nature. Therefore, the aims of this study are twofold: (i) to investigate the impact of competitive fatigue on the body composition of youth elite handball players, and (ii) to analyze the impact of concentrated competition on their functional capacity performance. Seventeen young male handball players (age: 16.2 years, height; 177.8 cm, body mass: 73.0 kg) were assessed twenty-four hours before (TM1) and after the competitive period (TM2) in body composition, static strength, lower- and upper-body explosive strength, speed, agility, balance, and flexibility indicators. A Wilcoxon Signed Rank Test was conducted to assess differences in body composition and functional capacities assessment between TM1 and TM2. Regarding results, body mass significantly increased in TM2 (p < 0.01), while increases in waist circumference and body fat percentage were not statistically significant. Functional capacity assessments revealed a significant decline in jumping performance (CMJ and SJ; p ≤ 0.01). Speed and agility assessments showed worse performance in TM2, significantly increasing 30 m sprint time (p ≤ 0.01). Balance indicators showed no significant differences, with mixed results in performance across different conditions. In sum, evaluating vertical jumps and long-distance maximum speed (i.e., 30 meters) could be valid tests for measuring and controlling fatigue in young elite handball players. Future research should regularly monitor young handballers after the competition to analyze the entire fatigue recovery process.
- Associations between muscular strength and vertical jumping performance in adolescent male football playersPublication . França, Cíntia; Marques, Adilson; Ihle, Andreas; Nuno, João; Campos, Pedro; Gonçalves, Frederica; Martins, João; Gouveia, ÉlvioThis study aimed to investigate the associations between muscular strength tests and vertical jumping performance (countermovement jump [CMJ] and squat jump [SJ]) in adolescent male football players, while controlling for important predictors such as chronological age and body composition. Methods. The sample involved 161 male footballers (mean age: 15.8 ± 1.7 years) from the under-19, under-17, and under-15 age groups. Body fat percentage (BF%) was calculated with Slaughter equations. Muscular strength assessment included handgrip strength and push-up and sit-up tests. Vertical jumping was examined through CMJ and SJ. Pearson correlations and hierarchical regression analyses were run to analyse the data. Results. All muscular strength tests showed significant correlations with CMJ and SJ. Handgrip strength was the most substantial predictor for CMJ (r = 0.43, p < 0.01) and SJ (r = 0.44, p < 0.01). However, regression models identified sit-ups (CMJ: = 0.15, p < 0.01, R2 = 0.23; SJ: = 0.16, p < 0.01, R2 = 0.27) and push-ups (CMJ: = 0.13, p < 0.01; SJ: = 0.15, p < 0.01) as significant predictors after controlling for chronological age, body mass, and BF%. In contrast, BF% remained a significant predictor of jumping performance (CMJ: = –0.43, p < 0.01, R2 = –0.39; SJ: = –0.52, p < 0.01, R2 = –0.52) in the whole hierarchical regression model. Conclusions. This study reinforces the importance of players’ overall physical development, including healthy diet habits, to enhance jumping performance.
- Atmos: a hybrid crowdsourcing approach to weather estimationPublication . Niforatos, Evangelos; Vourvopoulos, Athanasios; Langheinrich, Marc; Campos, Pedro; Doria, AndreMotivated by the novel paradigm of participatory sensing in collecting in situ automated data and human input we introduce the Atmos platform. Atmos leverages a crowd-sourcing network of mobile devices for the collection of in situ weather related sensory data, provided by available on-board sensors, along with human input, to generate highly localized information about current and future weather conditions. In this paper, we share our first insights of an 8-month long deployment of Atmos mobile app on Google Play that gathered data from a total of 9 countries across 3 continents. Furthermore, we describe the underlying system infrastructure and showcase how a hybrid people-centric and environment-centric approach to weather estimation could benefit forecasting. Finally, we present our preliminary results originating from questionnaires inquiring into how people perceive the weather, how they use technology to know about the weather and how it affects their habits.
- Bilateral asymmetry and the relationship between unilateral isokinetic strength and balance performance in male adolescent football playersPublication . França, Cíntia; Martins, Francisco; Martinho, Diogo; Ihle, Andreas; Marques, Adilson; Sarmento, Hugo; Clemente, Manuel; Przednowek, Krzysztof; Campos, Pedro; Gouveia, Élvio Rúbio; França, Cíntia; Pestana Martins, João Francisco; Gouveia, Élvio RúbioMuscle strength and balance ability have been related to injury prevention and game actions performance in football. The aims of this study are twofold: (1) to examine bilateral asymmetries in isokinetic strength and balance assessments, and (2) to evaluate the relationship between muscle strength and balance measures. Eighty-eight male adolescent football players were assessed for body composition (InBody 770), isokinetic strength (Biodex System 4 Pro Dynamometer), and balance performance (Biodex Balance System). Paired samples t-tests were conducted to determine bilateral differences in strength and balance. Pearson correlations and multiple linear regression analyses evaluated the relationship between strength and balance. No significant bilateral strength differences were observed in knee flexors (KF) and knee extensors (KE) peak torque (PT) scores. No bilateral differences were found for balance measures, except in the lateromedial stability index, which was better while performing with the preferred leg (p ≤ 0.01; d = 0.29). Significant correlations were found between KE PT and balance tasks (p ≤ 0.01). KF and KE PT shared between 18 and 22% of the common variance in the overall stability index in the non-preferred and preferred leg, respectively. Monitoring strategies of bilateral asymmetries may be crucial to enhance performance in tasks underpinned by unilateral movements, such as changes of direction and sprints, and to identify players at risk of injury. Adopting these strategies during the early stages of football training might be crucial for players’ long-term development.
- CanonSketch and TaskSketch: innovative modeling tools for usage-centered designPublication . Constantine, Larry; Campos, PedroTwo experimental tools to support usage-centered design using essential use cases and canonical abstract prototypes are described. The models and methods of usage-centered design are outlined and the new tools are described briefly.
- CBT-Darts: identifying cognitive distortions in an immersive VR gamePublication . Camacho, Élton; Campos, Pedro; Bala, Paulo; Pereira Campos, Pedro Filipe; Campos, Pedro; Bala, Paulo; Camacho, ÉltonCognitive Behavioral Therapy is a empirically validated treatment for anxiety and depression. By identifying negative thinking pat terns (cognitive distortions), individuals are able to reevaluate and reframe thinking patterns for better mental health. Building on pre vious research in digital health interventions, we explore the use of games and VR for increasing awareness of cognitive distortions. CBT-Darts is an immersive VR game where players match state ments to cognitive distortions by throwing darts at balloons. By mixing a physical and cognitive task, we hope to create an engaging and fun way to teach how to identify cognitive distortions.
- Characterizing psychomotor abilities of male handball players of different age categoriesPublication . Martins, Francisco; Śliż, Maciej; França, Cíntia; Sarmento, Hugo; Gouveia, Élvio Rubio; Campos, Pedro; Lopes, Helder; Przednowek, Krzysztof; Pestana Martins, João Francisco; França, Cíntia; Borges Sarmento, Hugo Miguel; Sarmento, Hugo; Gouveia, Elvio Rúbio; Gouveia, Élvio Rúbio; Pereira Campos, Pedro Filipe; Lopes, Helder; Przednowek, KrzysztofSports performance is highly influenced by players’ mental, emotional, and psychomotor abilities. Particularly in handball, training methods aim to maximize players’ performance by fusing physical conditioning with cognitive abilities. The aim of this research was twofold: (1) to characterize players’ psychomotor abilities according to their age categories (U14, U16, and U18), and (2) to analyze the differences between psychomotor abilities profiles according to players’ field positions. The study population comprised 75 male youth handball players (15.3 ± 1.5 years) from different competitive age groups (U14 = 20 players; U16 = 27 players; U18 = 28 players). The psychomotor abilities were evaluated using the Test2Drive system. Three tests were performed to measure psychomotor abilities: (a) a simple reaction time test (SIRT), (b) a choice reaction time test (CHORT), and (c) a spatial anticipation test (SPANT). The only statistically significant difference was observed in the percentage of correct answers in the SPANT, showing that U16 players had a higher rate of correct answers than the others. However, some trends were visible throughout the analysis: (i) the U16 group performed better in terms of reaction time in all the tests, (ii) right-wingers were always the ones who had the best percentage of correct answers, and (iii) central players had the best movement time performance. Future research should include youth players' maturation stage, body composition, and physical fitness performance to characterize their profile deeply and analyze their psychomotor abilities, considering other factors that can impact their sports performance.
- Citizen X: designing for holistic community engagementPublication . Ashby, Simone; Hanna, Julian; Oakley, Ian; Vieira, Tatiana; Abreu, Filipe; Campos, PedroCrowdsourcing in urban environments, geospatial annotation, social curation, and engaging citizens through social media applications and community-aware, place-based computing systems are at the forefront of pervasive urban technologies aimed at improving satisfaction, strengthening communities, and empowering citizens as stakeholders. This paper reports on the user-centered design of a holistic community engagement platform that combines the above aims and uncovers insights from both sides of the citizen-government divide for a people's GIS for enhancing urban livability.