Navegando por CNPq "CNPQ::CIENCIAS BIOLOGICAS::FISIOLOGIA::FISIOLOGIA DO ESFORCO"

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Acesso aberto (Open Access)
Condicionamento físico e desempenho em testes neuropsicológicos em adultos jovens
(Universidade Federal do Pará, 2015-12-21) TOMÁS, Alessandra Mendonça; DINIZ, Cristovam Wanderley Picanço; http://lattes.cnpq.br/2014918752636286; SÓSTHENES, Márcia Consentino Kronka; http://lattes.cnpq.br/7881527576747420
Brazil is a country in demographic transition period and significantly increased population over 65 years, which requires changes in public policies for health. The early onset of specific care to young adult population with a view to successful aging may represent future reduction of public and lower incidence of diseases associated with aging expenses such as dementias. To provide grants to health policies based on evidence, this study investigated the effects of physical fitness on performance in automated neuropsychological tests selected for measurement of learning functions, visuospatial memory and language. We evaluated 109 healthy young adults of both sexes, submitted to an interview; global cognitive assessment using the Mini Mental State Examination, language tests (including verbal fluency and word list of CERAD drums) and automated neuropsychological tests (Cantab Battery); assessment of physical fitness (indirect assessment of cardiorespiratory fitness, strength of lower limbs, agility assessment, measurement surround and anthropometric indices). Based on multivariate statistics by cluster analysis (Ward method, Euclidean distance) three groups divided volunteers, matched for age and education, to make up the ANOVA criterion or the Kruskal-Wallis, in the event of samples with unequal variances. In addition, the correlation analysis was performed, principal components and discriminant analysis, which showed that the cardiorespiratory fitness was the variable that most contributed to the formation of clusters. The level of significance was set at p ≤ 0.05 values. Significant differences were found in the semantic verbal fluency tests; in physical fitness tests including resting heart rate, cardiorespiratory fitness, lower limb strength and agility assessment and neuropsychological tests of Cantab Battery (paired learning - PAL and reaction time - RTI). The correlation analysis showed only weak correlations. The results obtained in this study indicate that fitness young adult practitioners or no regular exercise cannot predict performance on neuropsychological tests. However, the fitness shown to be associated with better performance on attention tasks, visuospatial memory and learning, measured through the PAL and RTI.
Acesso aberto (Open Access)
Efeito da suplementação aguda de guaraná (Paullinia Cupana) e de uma dose equivalente de cafeína sobre parâmetros de potência muscular na execução do exercício supino reto
(Universidade Federal do Pará, 2024) COLAÇO, Fernando Sampaio; PENNA, Eduardo Macedo; http://lattes.cnpq.br/3746450308327976; https://orcid.org/0000-0003-0058-7967
Introduction: Guarana (Paullinia Cupana) is a natural substance rich in caffeine and other bioactive components. It is known that its acute ingestion can improve cognitive performance and effort perception parameters, but it is still unclear whether this ingestion can be efficient as an ergogenic substance in the production of muscular power, and whether this possible ergogenic effect is due to its caffeine concentration Objective: The objective of the present research was to compare the effect of acute ingestion of Guaraná (Paullinia Cupana) with an equivalent dose of caffeine on muscle power parameters. Methods: 34 individuals (18 to 35 years old) practicing resistance training were recruited and randomized into three experimental situations: PLACEBO (PLA); 500mg of guarana (GUA-500, containing 130mg of caffeine) and 130mg of caffeine (CAF-130). The individuals underwent a familiarization session with the bench press exercise performed on the Smith machine, in which the individuals' 1RM value and the optimal load for power production were measured. After a minimum interval of 48 hours from the 1RM test and optimal load, the individuals performed, on different days, the three experimental sessions in a randomized order: acute ingestion of caffeine, placebo or Guarana. Each experimental situation had a minimum washout interval of two days. A percentage of optimal load for power production was estimated through a progressive test on the bench press using only the bar, 30%, 40%, 50% and 60% of 1RM in order to identify the best load to perform 3 sets up to 40% of the loss of movement speed, with a 5-minute break between sets. Before performing the physical task, the individuals performed two sets of five repetitions using the load identified as optimal, with a 3-minute break between each set. warm-up series. Participants performed the concentric phase of movement performed at maximum intentional speed, and the eccentric phase lasting 2 seconds, in which the following variables were measured: average power (Watts), peak power (Watts), peak speed (m/s), and average propulsive speed (m/s). Results: Regarding the number of repetitions achieved between the experimental situations, no statistically significant difference was identified between the factors capsule ingested (F(2, 264) = 1.4689, P = 0.2320; partial η² = 0.01); between the three series performed (F(2, 264 = 0.5775, P = 0.5620) and in relation to Capsule: Series (F = 0.2937, P = 0.8819), in relation to Peak Power, the analyzes did not detect any significant effect on the values Capsule (F (2,264) = 0.0908; P = 0.7479), Series (F (2, 264) = 1.5053; P = 0.2238) and for the interactions Capsule: Series (F (4, 264) = 0.7674; P = 0.5453), regarding Average Power, the analysis did not detect significant effects for the Capsule factors (F (2, 264) = 0.028; P = 0.972; partial η² < 0.01), Series (F (2, 264) = 1.187; P = 0.306; partial η² < 0.01), and for the Capsule interaction: series (F (4,264) = 1.266; P = 0.283; partial η² = 0.02), as for Peak Speed, the analysis indicated no effect for the Capsule factor (F (2,263) = 1.162; P = 0.314; partial η² < 0.01), a significant effect for the factor Series (F (2, 263) = 3, 479; P = 0.03; partial η² = 0.03), in the Capsule:series interaction analysis (F (4, 263) = 1, 337; P = 0.256 ; partial η² = 0.02), no significant effect was identified. With regard to Average propulsive speed, no significant differences were identified for the factors Capsule (F (2, 264) = 0.401; P = 0.669; partial η² = 0.01), Series (F (2,264) = 1 , 327; P = 0.266; partial η² < 0.01) and for the Capsule: series interaction (F (4, 264) = 1.199; P = 0.311; partial η² < 0.01). Conclusion: Supplementation with 500mg of Guarana containing 130mg and 130mg of caffeine alone did not trigger any ergogenic effect on muscle power parameters and bench press speed.
Acesso aberto (Open Access)
Influência da facilitação neuromuscular proprioceptiva na alteração da fibra do músculo rectus femoris vista através da eletromiografia de superfície e dinamometria analógica
(Universidade Federal do Pará, 2013-09-23) PIN, Alessandro dos Santos; SILVA FILHO, Manoel da; http://lattes.cnpq.br/2032152778116209
The PNF - Proprioceptive Neuromuscular Facilitation - is a technique that is increasingly being used in muscle training of healthy people and athletes. Studies have shown that resistance exercise, including PNF, are able to convert the trained muscle fiber type. This research aimed to verify the effectiveness of PNF in increased muscle strength and check for non-invasive methods would be indicative of conversion of muscle fiber type after training. A sample group of 22 young, female university students aged between 18 and 25 years, physically active, was divided into a control group (CG n = 10) and experimental group (EG n = 12). It was collected first the Maximum Volunteer Contraction MVC of Quadriceps muscle for analogic dynamometry and root mean square - RMS by surface electromyography (EMG) of all subjects. After the first data collecting GE conducted FNP based training in the dominant lower limb to 15 sessions in 5 weeks. Before the training sessions, new MVC and RMS data were collected of all samples. Regarding muscular strength, there was an increase in both groups, significant in CG (p< 0.01) and GE (p <0.05) for RMS and MVC time, there wasn´t significant increase in GE, but the interaction Vxt was significantly increased for this group. The results corroborate the literature by showing that muscles with a predominance of resistant fibers (fiber I / IIA) have greater contraction time with more electrical activation and that the FNP is able to type IIB fibers II A. In conclusion the training sample was efficient to increase muscle strength and EMG data presented show strong evidence of the conversion of muscle fibers trained.
Acesso aberto (Open Access)
Treinamento desportivo e incidência de infecções respiratórias agudas em atletas de natação (Belém, Pará)
(Universidade Federal do Pará, 2005-06-27) REIS, Fernando Vinicius Faro; SOUSA, Rita Catarina Medeiros; http://lattes.cnpq.br/3560941703812539
The physiologic stress exercise-induced can to raise the susceptibility of athletes to acute respiratory infections. This work evaluate the impact of training and matches competitions on incidence and duration of acute respiratory infections in swimmers of the “Associação dos Docentes da Escola Superior de Educação Física do Pará" team, Belém, Pará, of january to june of 2004. Follow up eighteen swimmers of both sex, including infantile (13 and 14 years), juvenile (15 and 16 years) and junior (17 and 18 years) categories during 24 weeks of training season to aim at the matches of swimming Brazilian championship in this categories. The volume training and number matched competitions were registered. Using a clinic and epidemiologic questionary to survey the occurrence of signs and symptoms suggesting of flu and cold, we registered the number and time of respiratory infection episodes. The incidence (61,1%) and durations (9,5 days) of acute respiratory infections don’t were differ between sex, categories ands seasons of training. Identify frequently searching of the respiratory infections episodes in the followed up athletes. A clinic profile of respiratory infections, like flu, was observed, suggesting that Influenza virus appear to constitute the major etiologic agent of the respiratory infections presented by studied athletes. The results of study we conclude that incidence and durations of acute respiratory infections don’t were altered by volume training and number of competitions.