Browsing by Author "Fernandes, Ricardo J."
Now showing 1 - 10 of 11
Results Per Page
Sort Options
- Anaerobic Threshold Individualized Assessment in a Young SwimmerPublication . Fernandes, Ricardo J.; Sousa, Marisa; Pinheiro, Armindo; Vilar, Sonia; Colaco, Paulo; Vilas-Boas, J. Paulo
- Assessment of individual anaerobic threshold and stroking parameters in swimmers aged 10–11 yearsPublication . Fernandes, Ricardo J.; Sousa, Marisa; Pinheiro, Armindo; Vilar, Sonia; Colaço, Paulo; Vilas-Boas, J. Paulo
- AVALIAÇÃO DA COORDENAÇÃO ENTRE MEMBROS SUPERIORES NA TÉCNICA DE CROL EM NADADORES INFANTISPublication . Silva, Ana; Figueiredo, Pedro; Renato, Paulo; Amaral, Inês; Sousa, Marisa; Sampaio, António; Soares, Susana; Vilas-boas, J.Paulo; Fernandes, Ricardo J.
- Biomechanical analyses of synchronised swimming standard and contra-standard scullingPublication . Gomes, Lara Elena; Diogo, Vera; Castro, Flávio Antônio de Souza; Vilas-Boas, João Paulo; Fernandes, Ricardo J.; Figueiredo, PedroSynchronised swimming involves a variety of sculling movements essential for body support and propulsion but its study is scarce. We aimed to biomechanically compare standard and contra-standard sculling techniques, and to observe the relationship between measures. Six synchronised swimmers performed two, 30 s maximal intensity, fully tethered standard and contra-standard sculling motions. Kinetic and kinematic data were obtained using a load-cell and underwater cameras, respectively. Force decreased along both techniques' bouts, but no differences in-between techniques were noted for any kinetic variables. Standard sculling presented a higher cycle rate and a lower elbow mean angle than the contra-standard sculling (2.4 ± 0.3 vs. 2.0 ± 0.2 cycles/s and 134.1 ± 5.8 and 141.5 ± 4.7°, p < 0.05). In the standard sculling, by removing and maintaining the variation between participants (r w and r, respectively), the absolute mean force was directly related with cycle rate (r w = 0.60) and wrist angular velocity during flexion (r = 0.82), while in the contra-standard condition the force was inversely associated with wrist mean angle (r = -0.95) and directly with hand speed (r w = 0.76), and elbow angular velocity (r w ≈ 0.60). Therefore, technique learning and training require different attention by coaches and swimmers.
- Biophysical Determinants of Front-Crawl Swimming at Moderate and Severe IntensitiesPublication . Ribeiro, João; Toubekis, Argyris G.; Figueiredo, Pedro; de Jesus, Kelly; Toussaint, Huub M.; Alves, Francisco; Vilas-Boas, João P.; Fernandes, Ricardo J.To conduct a biophysical analysis of the factors associated with front-crawl performance at moderate and severe swimming intensities, represented by anaerobic-threshold (vAnT) and maximal-oxygen-uptake (vV̇O2max) velocities.
- Do player performance, real sport experience, and gender affect movement patterns during equivalent exergame?Publication . Soltani, Pooya; Figueiredo, Pedro; Fernandes, Ricardo J.; Vilas-Boas, João PauloThis study compared the movement patterns of forty-six college students, playing bouts of swimming exergame, while categorized based on their playing performance, gender, and prior experience of real swimming and exergames. Swimming events were divided into normal (controlled by visual feedback) and fast (no feedback) phases and upper limb kinematics were monitored during front crawl event. Those who performed better, completed the game with fewer upper limb cycles and in a shorter time (p < 0.003). Prior exergame experience resulted in higher start velocity (p ¼ 0.019) and those who were familiarized with this swimming exergame, completed the front crawl event with fewer cycles (p ¼ 0.022). Gender and real swimming experience did not affect biomechanical variables. With various playing styles and differences to real swimming movements, the data suggest that the motion capture device is not able to detect complex movements of swimming and previous knowledge of real swimming do not necessarily transfer into better exergame performance. These changes might have happened due to higher adaptation to the exergame. Understanding these patterns may help in the development of more realistic sport exergames and meaningful gameplay
- Does Warm-Up Have a Beneficial Effect on 100-m Freestyle?Publication . Neiva, Henrique P.; Marques, Mario C.; Fernandes, Ricardo J.; Viana, João L.; Barbosa, Tiago M.; Marinho, Daniel A.To investigate the effect of warm-up on 100-m swimming performance.
- Influence of Prior Exercise on VO2 Kinetics Subsequent Exhaustive Rowing PerformancePublication . Sousa, Ana; Ribeiro, João; Sousa, Marisa; Vilas-Boas, João Paulo; Fernandes, Ricardo J.Prior exercise has the potential to enhance subsequent performance by accelerating the oxygen uptake (VO2) kinetics. The present study investigated the effects of two different intensities of prior exercise on pulmonary VO2 kinetics and exercisetime during subsequent exhaustive rowing exercise. It was hypothesized that in prior heavy, but not prior moderateexercise condition, overall VO2 kinetics would be faster and the VO2 primary amplitude would be higher, leading to longerexercise time at VO2max. Six subjects (mean 6 SD; age: 22.964.5 yr; height: 181.267.1 cm and body mass: 75.563.4 kg)completed square-wave transitions to 100% of VO2max from three different conditions: without prior exercise, with priormoderate and heavy exercise. VO2 was measured using a telemetric portable gas analyser (K4b2, Cosmed, Rome, Italy) andthe data were modelled using either mono or double exponential fittings. The use of prior moderate exercise resulted in afaster VO2 pulmonary kinetics response (t1 = 13.4163.96 s), an improved performance in the time to xhaustion(238.8650.2 s) and similar blood lactate concentrations ([La2]) values (11.861.7 mmol.L21) compared to the onditionwithout prior exercise (16.065.56 s, 215.3660.1 s and 10.761.2 mmol.L21, for t1, time sustained at VO2max and [La2], respectively). Performance of prior heavy exercise, although useful in accelerating the VO2 pulmonary kinetics responseduring a subsequent time to exhaustion exercise (t1 = 9.1861.60 s), resulted in a shorter time sustained at VO2max(155.5646.0 s), while [La2] was similar (13.561.7 mmol.L21) compared to the other two conditions. Although both priormoderate and heavy exercise ulted in a faster pulmonary VO2 kinetics response, only prior moderate exercise lead to improved rowing performance.
- Integrated Analysis of Young Swimmers’ Sprint PerformancePublication . Silva, Ana F.; Figueiredo, Pedro; Ribeiro, João; Alves, Francisco; Vilas-Boas, João Paulo; Seifert, Ludovic; Fernandes, Ricardo J.To analyze young swimmers' performance regarding sex and skill level, 23 boys and 26 girls (15.7 ± 0.8 and 14.5 ± 0.8 years old, respectively) were assessed for anthropometry, flexibility, strength, drag, coordination, and biomechanical variables. During a 50-m maximal front-crawl bout, seven aerial and six underwater Qualisys cameras assessed kinematics, and a load cell was used to measure drag (Tedea, United Kingdom) and tethered swimming force. A multivariate analysis of variance test (p < .05) enabled us to observe differences between skill levels in speed, stroke frequency, stroke index, and intracyclic velocity variations, but most relevant differences were noticed when comparing sexes, particularly for anthropometrics, shoulder flexibility, speed, stroke frequency, stroke length, drag, mechanical power, power per stroke, and maximal and mean force. Considering the included variables, only male swimmers' performance could be predicted through multiple linear regression, with stroke index, left shoulder flexion, and intracycle velocity variations showing great importance in achieving better results.
- Task Constraints and Coordination Flexibility in Young SwimmersPublication . Silva, Ana F.; Figueiredo, Pedro; Morais, Sara; Vilas-Boas, João P.; Fernandes, Ricardo J.; Seifert, LudovicThis study aimed to examine young swimmers' behavioral flexibility when facing different task constraints, such as swimming speed and stroke frequency. Eighteen (five boys and 13 girls) 13- to 15-year-old swimmers performed a 15 × 50-m front crawl with five trials, at 100%, 90%, and 70% each of their 50 m maximal swimming speed and randomly at 90%, 95%, 100%, 105%, and 110% of their preferred stroke frequency. Seven aerial and six underwater cameras were used to assess kinematics (one cycle), with upper-limb coordination computed through a continuous relative phase and index of coordination. A cluster analysis identified six patterns of coordination used by swimmers when facing various speed and stroke frequency constraints. The patterns' nature and the way the swimmers shifted between them are more important than getting the highest number of patterns (range of repertoire), that is, a change in the motor pattern in order to adapt correctly is more important than being able to execute a great number of patterns.