1,717 research outputs found
Head-to-head cycling and mental fatigue
No full textStudy about the acute effect of head-to-head cycling on 20-km time trial cycling in athletes mentally fatigued
Homenaje a Leonardo Polo
No full text15 páginasEste libro reúne diferentes artículos que ahondan en el concepto de abandono del límite mental, estipulado por Leonardo Polo, el filósofo español del siglo XX que ha propuesto una novedosa teoría del conocimiento de signo realista, la cual incluye el descubrimiento del límite mental.Semblanza de Leonardo Polo
Presentación
ESTUDIOS SOBRE EL PENSAMIENTO FILOSÓFICO DE LEONARDO POLO
Capítulo 1. Importancia de la filosofía de Leonardo Polo en la historia del Pensamiento humano y en nuestro momento actual
Juan A. García González
Capítulo 2. El método de la metafísica: la propuesta de Leonardo Polo
Juan José Sanguineti
Capítulo 3. El abandono del límite mental como método para la filosofía: libre glosa al planteamiento de Leonardo Polo
Jorge Mario Posada
Capítulo 4. El principio de causalidad como vigencia entre los primeros principios Rafael Corazón González
Capítulo 5. Las dualidades en las ciencias humanas: un intento de fundamentación, jerárquicamente ordenado, de los saberes humanísticos según Leonardo Polo
Juan Fernando Sellés
Capítulo 6. Buscad mi rostro: el conocimiento humano de Dios según Leonardo Polo
Hernán Salcedo Plazas
AVANCES DE INVESTIGACIÓN SOBRE DIVERSOS ASPECTOS DE LA REALIDAD HUMANA A LA LUZ DEL PENSAMIENTO DE LEONARDO POLO
Capítulo 7. Persona y verdad en la filosofía de Leonardo Polo: los barruntos de la persona en los socráticos
Genara Castillo
Capítulo 8. Los implícitos de la noción de `noúmeno¿
Rafael Reyna Fortes
Capítulo 9. Temas centrales para los empresarios: persona, ética, innovación y emprendimiento. La propuesta de Leonardo Polo
Silvia Carolina Martino
Capítulo 10. ¿Puede hablarse de espiritualidad en las organizaciones y en una escuela de administración?
Gustavo González Coutur
Relative Age Effect is Modulated by Playing Position but is Not Related to Competitive Success in Elite Under-19 Handball Athletes
No full textThis study aimed to verify the occurrence of the relative age effect (RAE) in male elite young handball athletes according to the playing position and its association with team performance in a World Championship. Data from 383 handball athletes from 24 countries who participated in the 7th World Men’s Championship in the under-19 category were analyzed. RAE was investigated from the birth trimester of the athletes, their playing position, and final ranking in the Championship. The results showed an overrepresentation of athletes born in the first two trimesters (Q1 and Q2) (χ2(3) = 32.97; p < 0.001, ω = 0.29). The analysis of the athlete’s position showed that most wings (χ2(3) = 18.37; p < 0.001, ω = 0.32) and backs (χ2(3) = 12.51; p = 0.006, ω = 0.34) were born in the first trimesters (Q1 and Q2). The ranking in the Championship presented no significant association with the date of the birth (p > 0.05). The results showed the existence of the RAE in youth handball elite athletes, especially for the back and wing positions. However, the strategy of selecting is questionable once the presence of RAE was not associated with competitive success
Effects of mental fatigue on perception of effort and performance in national level swimmers
No full textObjective: This study aimed to investigate the effects of mental fatigue on the perceptual and physiological responses to swimming at the lactate threshold (LT) and on 400-m front-crawl performance. Methods: Ten national-level swimmers were tested three separate times. In the first session, swimmers performed a 7x200-m incremental test for LT assessment. In sessions two and three, participants performed the AX-Continuous Performance Task for 90-min (mental fatigue condition) or rested for 90-min (control condition) in a randomized and counterbalanced order. After the experimental manipulation, the participants performed a 12x100-m constant-speed test at LT followed by a 400-m front-crawl performance test. Fatigue was measured using the Brunel Mood Scale before and after the experimental manipulation. Heart rate (HR), blood lactate concentration (La) and rating of perceived exertion (RPE) were measured during the swimming tests. Generalized Mixed Models were used to test main effects and interactions, and Holm-Bonferroni post-hoc correction was applied when necessary (p < 0.05). Results: Fatigue increased only for the mental fatigue condition (p = 0.018). During the 12 x 100 m constant-speed test at LT, athletes in the mental fatigue condition presented higher RPE (p = 0.001) despite similar HR and La responses compared to control. Performance in the 400-m front-crawl test was significantly impaired in mentally fatigued swimmers (p < 0.001). Conclusion: These findings show that mental fatigue increases the perception of effort during swimming at LT despite no significant physiological alterations and reduces 400-m front-crawl performance in national level swimmers
Effect of brain endurance training on maximal oxygen uptake, time-to-exhaustion, and inhibitory control in runners
No full textWe aimed to analyze the effect of brain endurance training on maximum oxygen consumption (VO2max), time-to-exhaustion, and inhibitory control in amateur trained runners. We employed a mixed experimental design, with the group as the between-participant factor and time as the within-participant factor. 45 participants attended 36 training sessions over 12 weeks. The cognitive training group (CT) performed the Stroop word-color task [trials of each type (congruent, incongruent, and neutral) were randomly presented during each training session], the endurance training group (ET) participated in a running training program (intensity was 60%. of maximal aerobic velocity and performed on a motor-driven treadmill), and the brain endurance training group (BET) make cognitive and endurance training simultaneously over 12 weeks. The total time of each session (i.e., 20-40 min) was identical in the experimental groups. VO2max, time-to-exhaustion, and inhibitory control tests were measured before (baseline) and after (post-experiment) the 12-week intervention. A significant effect of interaction (group x time) for VO2max (p < 0.05) was found. A post-hoc test showed an increase in VO2max from baseline to post-experiment only for ET (Delta% = 2.98) and BET (Delta% = 3.78) groups (p < 0.05). Also, the analyses showed a significant interaction (group x time) for time-to-exhaustion (p < 0.05), and a post-hoc test revealed an improvement in time-to-exhaustion for ET (Delta% = 8.81) and BET (Delta% = 11.01) (p < 0.05). No group x time interaction was found for accuracy and response time in the inhibitory control task (p > 0.05). The results conclude that BET was not superior to ET for improving VO2max and time-to-exhaustion. Also, the findings conclude that BET improved inhibitory control similar to CT
Acute effect of intensity and volume during strength training on sensation of pleasure, rating of perceived exertion, and pain in trained men
No full textPurpose. The purposes of this study were: (a) to compare the sensation of pleasure, rating of perceived exertion (RPE), and pain in different volumes (volitional failure [VF] vs. fixed repetitions [FR]), equalizing the intensity; and (b) to compare the sensation of pleasure, RPE, and pain in different intensities (40%, 60%, and 80%) of one-repetition maximum (1RM), with equalization of training volume. Methods. A total of 12 trained men (aged 24.9 ± 4.3 years) performed 3 sets of seated row, leg press 180°, and chest press at 3 different intensities (40%, 60%, and 80% 1RM) for both training strategies (VF vs. FR). Results. There was a decrease in pleasure and an increase in RPE and pain in VF training sessions at intensities of 40% and 60% 1RM compared with FR. However, no difference was observed for the intensity of 80% 1RM for pleasure. A doseresponse effect was revealed in the comparison of intensities for pain and RPE. In turn, no effect was found for pleasure. Conclusions. VF training sessions decreased responses regarding pleasure, as well as increased RPE and perceived pain for the intensities of 40% and 60% 1RM when compared with the same intensity in FR among trained men. Different intensities were not able to change the sensation of pleasure
Letter to the Editor regarding the article "A 4-week endurance training program improves tolerance to mental exertion in untrained individuals"
No full textTo the Editor. We read with excitement the original article by Filipas et al. (2020) about the influence of physical training on tolerance to mental fatigue. First, we congratulate the authors for their recent work on mental fatigue, which has generated valuable discussion. In the last decade, several studies have shown that mental fatigue decreases cognitive and exercise performance. Thus, understanding how ergogenic interventions, individual characteristics, and strategies that might reduce mental fatigue's deleterious effects is crucial. Although we agree that the present study is relevant and the methods are well-conducted, we propose that the results may have been misinterpreted. The title and discussion state that endurance training improves tolerance to mental exertion; however, the results indicate the contrary. The rationale that an improvement in physical performance was due to increased mental fatigue tolerance without any change in cognitive or mental fatigue scores seems flawed. It is well-established in the literature that physical training alone might have caused the observed physiological adaptations responsible for improving performance. For example, even in theoretical models that consider the brain the determinant factor, the periphery (e.g., cardiorespiratory fitness) plays an essential role in modulating endurance performance. According to the psychobiological theory model, any factor that affects the rating of perceived exertion (RPE) and motivation will, in turn, affect performance. Thus, once motivation was similar between groups, we should closely observe what caused the differences in the RPE
Does Social Media Use on Smartphones Influence Endurance, Power, and Swimming Performance in High-Level Swimmers?
No full textObjective: This study aimed to investigate the repeated effect of social media on smartphones immediately before training sessions on inhibitory control (Stroop task), endurance (tethered swimming), countermovement jump (CMJ), and swimming performance (50, 100, and 400-m freestyle) in high-level female swimmers.Methods: It is a randomized and experimental investigation with parallel groups. Twenty-two participants underwent the eight weeks of the experiment. The swimmers (eight to twelve sessions per week with 15.9 +/- 1.6 hours/week, and training experience of similar to 5.6 years) were randomized in two groups: control (CON,n= 11) and smartphone (SMA,n= 11). Immediately before each training session, the CON group watched videos about Olympic Games for 30-min. The SMA group used social network smartphone apps during 30-min. The inhibitory control, endurance, CMJ, and swimming performance were measured before and after the eight weeks of intervention.Results: No group x time interaction for 50-m freestyle (F-(4,F- 18) = 1.04;p= .33;eta(2) = 0.09) and CMJ performance (F-(4,F- 18) = 0.31;p= .58;eta(2) = 0.03) was found. Both experimental groups improved CMJ (F-(2,F- 20) = 8.71;p= .01;eta(2) = 0.46). Only the CON group improved the 100-m (p= .02), 400-m freestyle (p= .01), and endurance performance (p= .01). The CON group improved the inhibitory control response (p= .01).Conclusion: It is concluded that the repeated effect of social media on smartphones immediately before swimming training sessions might reduce or nullify training gains on swimming and endurance performance
Utilisation de règles -fortes pour caractériser des classes
No full text@inproceedings{CN-CREMILLEUX-2002, author = {Crémilleux, B. and Boulicaut, J-F.}, title = {Utilisation de règles -fortes pour caractériser des classes}, booktitle = {Actes du 13ème Congrès Francophone AFRIF-AFIA de Reconnaissance des Formes et Intelligence Artificielle (RFIA'02)}, year = {2002}, month = {janvier}, address = {Angers, France}, pages = {685-694} }National audienc
Prolonged cognitive effort impairs inhibitory control and causes significant mental fatigue after an endurance session with an auditive distractor in professional soccer players
No full textBackground
Throughout official soccer matches, the presence of cheer by the crowd could be considered a critical auditive distraction that could further impair the cognitive interference control system, multiple object tracking (MOT) skill, heart rate variability (HRV), and increase mental fatigue. As the resource is not immediately replenished, the impairment of the cognitive interference control system may be delayed following a soccer game. Then, evaluating the recovery time course of the cognitive interference control system, MOT skill, HRV, and mental fatigue after prolonged tasks combining physical, endurance, and cognitive effort are essential.
Purpose
We aimed to analyze the acute effect of cognitive effort and auditive distractor with 24-h follow-up throughout a prolonged endurance session on inhibitory control, subjective mental fatigue, MOT skill, and HRV in professional soccer players.
Methods
Twenty professional male soccer players were recruited (23.56 ± 3.8 years, 78.1 ± 6.9 kg, 1.77 ± 0.06 m, and 12.5 ± 5.3% body fat). The sessions were performed in a randomized and counterbalanced crossover design, divided into four experimental conditions: endurance, endurance + MOT, endurance + MOT + AD, and endurance + AD. The soccer players completed the incongruent Stroop task utilizing an eye-tracker to assess cognitive effort. MOT task, subjective mental fatigue, and HRV were evaluated before the endurance training (60%Δ of maximal aerobic velocity during 40-min) and after 30-min and 24-h of recovery. These sessions were designed to investigate the acute effect of prolonged cognitive effort (repeated MOT throughout the endurance task) and AD (constant crowd noise and coach's voice each 15–40 s, totalizing = 80 voices) on inhibitory control, MOT skills, HRV, and subjective mental fatigue after a fixed endurance training session.
Results
There was no condition × time interaction for accuracy of inhibitory control (p > 0.05, ηp2 = 0.001). There was a significant condition × time interaction for inhibitory control response time (p < 0.05, ηp2 = 0.16). A higher response time of inhibitory control was found for the endurance + MOT + AD and endurance + MOT experimental sessions (p < 0.05). There was a significant condition × time interaction for subjective mental fatigue (p < 0.05, ηp2 = 0.46). A higher subjective mental fatigue was found for the endurance + MOT + AD and endurance + MOT experimental sessions (p < 0.05). There was no condition × time interaction for HRV (p > 0.05, ηp2 = 0.02).
Conclusion
We concluded that cognitive effort throughout a prolonged endurance session impaired inhibitory control and increased mental fatigue without promoting greater MOT skill and HRV changes in professional soccer players
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