ABSTRACT
Purpose: This study aimed to compare the performance-derived parameters utilizing isolinear (ISOLIN) and isovelocity (ISOVEL) sprint cycling modes. Method: For that, 20 male trained cyclists performed 2 sprints of 7 s on an electromagnetically braked cycle ergometer in ISOLIN and six sprints in ISOVEL mode with cadences between 90 and 180 rpm, each separated by 3-min. A linear function modeled the sprints within each mode to extrapolate maximal cadence (CMAX) and torque (TMAX), and a quadratic function was used to extrapolate the apex defined as optimal cadence power (OPTCAD) and peak power output (PMAX). Fifteen subjects performed another 4 sprints at ISOLIN mode on different days to verify the reliability. Results: The measures from the power-cadence relationship were not different between the ISOLIN and ISOVEL modes. Although significant differences were detected in the T-C relationship, TMAX was greater at ISOLIN than ISOVEL (p = .006). On the other hand, CMAX was higher at ISOVEL than ISOLIN (p < .001). The correlation between parameters was large to very large (r = 0.51 to 0.89). However, high limits of agreement were verified. The ISOLIN presented consistency during the trials, and the random errors were acceptable (CV = 5.3% to 11.5%). Conclusion: Using the power-cadence relationship, PMAX and OPTCAD could be detected similarly between the two sprint modes (ISOLIN and ISOVEL). Thus, the findings demonstrated that a single ISOLIN sprint test could be a suitable tool for quantifying the time course of muscle fatigue during and after cycling exercises in well-trained male cyclists.
ABSTRACT
Abstract The identification of barriers to regular physical activity (PA) is a form of an initial and effective strategy to encourage behavior modification and adherence to a more active lifestyle in hypertensive patients. This cross-sectional study aimed to identify the barriers to PA practice in patients with hypertension classified as physically inactive and to analyze the association of the number of these barriers with sociodemographic factors and health indicators. Two hundred one hypertensive patients of both sexes (61.7±12.7 years) answered an anamnesis with health information and sociodemographic data, a PA level questionnaire, and a barrier questionnaire for the practice of PA. Regarding the level of PA of the participants, 48.8% were classified as physically inactive and reported, on average, 6.1 (±3.8) barriers to PA practice, with the barrier "fear of falling or getting hurt" the most commonly reported. Furthermore, women and patients with low education, negative perception of health, and a greater presence of comorbidities reported a greater number of barriers to PA practice. PA practice as a non-pharmacological tool for the treatment of hypertension should focus on women and patients with low education, negative perception of health, and a greater presence of associated comorbidities.
Resumo A identificação de barreiras à atividade física regular (AF) é uma forma de estratégia inicial e eficaz para encorajar a modificação do comportamento e a adesão a um estilo de vida mais ativo em pacientes hipertensivos. Este estudo transversal visou identificar as barreiras à prática de AF em pacientes com hipertensão classificados como fisicamente inativos e analisar a associação do número destas barreiras com fatores sociodemográficos e indicadores de saúde. Duzentos e um pacientes hipertensos de ambos os sexos (61.7±12.7 anos) responderam a uma anamnese com informações de saúde e dados sociodemográficos, um questionário de nível de AF, e um questionário de barreira para a prática de AF. Relativamente ao nível de AF dos participantes, 48,8% foram classificados como fisicamente inativos e reportaram, em média, 6,1 (±3,8) barreiras à prática de AF, sendo a barreira "medo de cair ou de se magoar" a mais frequentemente reportada. Além disso, mulheres e pacientes com baixa educação, percepção negativa da saúde, e uma maior presença de comorbidades reportaram um maior número de barreiras à prática de AF. A prática de AF como ferramenta não farmacológica para o tratamento da hipertensão deve ter como foco mulheres e pacientes com baixa escolaridade, percepção negativa de saúde e maior presença de comorbidades associadas.
ABSTRACT
This study aimed to assess the predictive capability of different critical power (CP) models on cycling exercise tolerance in the severe- and extreme-intensity domains. Nineteen cyclists (age: 23.0 ± 2.7 y) performed several time-to-exhaustion tests (Tlim) to determine CP, finite work above CP (W'), and the highest constant work rate at which maximal oxygen consumption was attained (IHIGH). Hyperbolic power-time, linear power-inverse of time, and work-time models with three predictive trials were used to determine CP and W'. Modeling with two predictive trials of the CP work-time model was also used to determine CP and W'. Actual exercise tolerance of IHIGH and intensity 5% above IHIGH (IHIGH+5%) were compared to those predicted by all CP models. Actual IHIGH (155 ± 30 s) and IHIGH+5% (120 ± 26 s) performances were not different from those predicted by all models with three predictive trials. Modeling with two predictive trials overestimated Tlim at IHIGH+5% (129 ± 33 s; p = 0.04). Bland-Altman plots of IHIGH+5% presented significant heteroscedasticity by all CP predictions, but not for IHIGH. Exercise tolerance in the severe and extreme domains can be predicted by CP derived from three predictive trials. However, this ability is impaired within the extreme domain.
ABSTRACT
O objetivo do presente estudo foi verificar o desempenho de corrida e natação de guarda-vidas civis após uma temporada de verão em Florianópolis SC. Quatorze guarda-vidas civis (idade: 23.4 ± 5.0 anos; massa corporal: 74.6 ± 8.9 kg; estatura: 176 ± 0.1 cm) realizaram testes de 500m de natação e 1600m de corrida antes e após uma temporada de verão de 5 meses. Não foi realizada nenhuma intervenção na rotina dos guarda -vidas durante esse período. A comparação no desempenho pré e pós temporada foi realizada pelo teste t de Student para dados pareados (bicaudal), enquanto as correlações entre as variáveis foram verificadas pelo coeficiente de correlação de Pearson, com nível de significância de 5% (p < 0.05). Houve piora nos tempos dos testes de 500m de natação (Pré: 501.4 ± 77.9; Pós: 523.1 ± 84.6 s; p < 0.01) e 1600m de corrida (Pré: 371.6 ± 42.3 s; Pós: 393.9 ± 42.7 s; p < 0.01), sem associação entre o tempo de desempenho pré-temporada no teste de natação (r = 0.441, p = 0.115) ou corrida (r = -0.179, p = 0.541) com as magnitudes de piora. Concluiu-se que houve uma piora no desempenho de corrida e natação ao término da temporada de verão nos guarda-vidas civis, o que pode levar a uma perda no rendimento nas atividades que são submetidos rotineiramente. Dessa forma, tornam-se importantes estratégias, como o treinamento sistematizado, para minimizar essa queda no rendimento dos guarda-vidas civis, evitando o risco a si mesmo e a potenciais vítimas.(AU)
: The aim of this study was verify the performance of the running and swimming of civilian lifeguards after a summer season in Florianópolis - SC. Fourteen civilian lifeguards (age: 23.4 ± 5.0 years; body mass: 74.6 ± 8.9 kg; height: 176 ± 0.1 cm) performed tests of 500m swimming and 1600m running before and after a summer season of 5 months. There was no intervention in the routine of the lifeguards during this period. Statistical analysis consisted of a paired t-test (two-tailed) for the pre and post-season comparison, with the correlations between the variables being verified by Pearson's correlation coefficient, with level of significance of 5% (p < 0.05) for all tests. There was an impairment in the 500m swimming test (Pre: 501.4 ± 77.9; Post: 523.1 ± 84.6 s; p <0.01) and 1600m running test (Pre: 371.6 ± 42.3 s; Post: 393.9 ± 42.7 s; p <0.01), without association between the pre-season performance time and the swimming (r = 0.441, p = 0.115) or running (r= -0.179, p = 0.541) impairment magnitudes. It was concluded that running and swimming performance are impaired at the end of the summer season on civilian lifeguards, which could cause a loss of performance in routine activities. Thus, become important strategies, such as systematic training, to minimize this fall in the performance of civilian lifeguards, avoiding the risk to themselves and potential victims. (AU)
