Utilização do esforço percebido na determinação da velocidade crítica em corrida aquática

A relação linear entre intensidade do exercício e taxa de aumento da atividade neuromuscular avaliada pela eletromiografia permite a estimativa do limiar de fadiga, que seria a intensidade que poderia ser mantida indefinidamente sem aumento dos sinais eletromiográficos ao longo do tempo. Levantou-se a hipótese de que a percepção subjetiva de esforço teria comportamento semelhante ao da ativação neuromuscular e que um limiar de esforço percebido (LEP), identificado de forma semelhante ao limiar de fadiga eletromiográfica, poderia coincidir com a velocidade crítica (VCrit). Treze indivíduos de ambos os sexos (23,0 ± 2,5 anos), em uma piscina de 15m de extensão e 2,5m de profundidade, realizaram três testes exaustivos de corrida aquática para determinação dos parâmetros do modelo de velocidade crítica, reportando o esforço percebido (escala de Borg de 6-20 pontos), a cada 15m. Para identificação do LEP, os coeficientes de inclinação das retas do aumento do esforço percebido no tempo (ordenada) e velocidades utilizadas (abscissa) foram ajustados a uma função linear que fornecia um ponto no eixo da velocidade onde, teoricamente, o esforço percebido seria estável indefinidamente. A VCrit foi estimada pelas equações usadas no modelo de velocidade crítica. Para comparação das estimativas de VCrit e do LEP, e de suas associações, foi feita ANOVA para medidas repetidas (p < 0,05) e calculada a correlação de Pearson. Os dados obtidos para a determinação da VCrit atenderam aos critérios adotados para a validade do modelo; a VCrit e o LEP não apresentaram diferença estatística (0,23 ± 0,02m/s x 0,24 ± 0,03m/s) e foram significativamente correlacionados (r = 0,85). Esses resultados sugerem que o LEP parece representar a intensidade máxima de exercício em que variáveis fisiológicas e psicofísicas encontrariam estabilidade, e que esse índice pode ser utilizado na determinação da VCrit.

O limiar de esforço percebido (LEP) corresponde à potência crítica e a um indicador de máximo estado estável de consumo de oxigěnio

The perceived exertion has been a target of several investigations, many times with association with objective physiological indicators in exercise. Recently, the identification of the perceived exertion threshold (PET) was proposed in the water running, which presented no difference in relation to the critical velocity. Theoretically, both parameters would be indicators of the maximum steady state of variables such as V̇O2 and blood lactate. The objective of this work was to verify the coincidence between PET, critical power (PCrit) and an indicator of maximum V̇O2 steady state (PCrit') in cycle ergometer. Eight male participants were submitted to progressive effort test in order to determine V̇O2peak (46.7 ± 8.5 ml/kg/min) and to four rectangular tests until exhaustion for the estimation of the critical power model parameters, PET and PCrit'. The hyperbolic relation between mechanical power and time spent for the V̇O2peak to be reached in each test was used for the PCrit' estimation, considered as the asymptote in the power axis, and the portion of the anaerobic work capacity (CTAnaer) depleted up to the establishment of the V̇O2peak (CTAnaer'). In order to identify PET, the straight lines angular coefficients of the perceived exertion in time (ordinate) and the powers used (abscissa) were adjusted to a linear function that provided a point in the power axis in which the perceived exertion would be kept indefinitely stable. The parameters PCrit and CTAnaer were estimated by means of the power-time non-linear equation. In order to compare the estimations of PET, PCrit and PCrit', the analysis of variance ANOVA for repeated measurements was employed, and the associations were established through the Pearson correlation. CTAnaer and CTAnaer' were compared through the t test. PET (180 W ± 61 W), PCrit (174 W ± 43 W) and PCrit' (176 W ± 48 W) were not significantly different and the correlations were of 0.92-0.98. CTAnaer' (14,080 ± 5,219 J) was lower than CTAnaer (22,093 ± 9,042 J). One concludes that the PET predicts the intensity of PCrit and PCrit' with accuracy.

Validação das escalas de preocupação com o peso corporal e de estresse percebido

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Prática de caminhada no lazer e no deslocamento e associação com fatores socioeconômicos e ambiente percebido em adultos

O objetivo do presente estudo foi analisar a associação da prática de caminhada no domínio lazer e no domínio deslocamento com a percepção do ambiente em adultos residentes no município de Rio Claro - SP. Foi realizado um estudo transversal de base domiciliar com amostra composta por 470 adultos (45,7±17,8 anos). Os sujeitos responderam o Questionário Internacional de Atividades Físicas (versão longa) e uma versão adaptada da Escala de Mobilidade Ativa no Ambiente Comunitário, que foi utilizada para investigar a percepção do ambiente construído e social. Para análise dos dados foi realizada uma regressão logística, sendo considerado como desfecho, caminhar ≥10minutos/semana no domínio lazer e no deslocamento. A prevalência de sujeitos que realizavam caminhada no lazer foi de 20,6% e 58,9% para a caminhada no deslocamento. A prevalência de caminhada no deslocamento entre as mulheres foi maior quando comparado com os homens (66,3% e 50,0%, respectivamente) e menor no domínio lazer (19,8% e 21,7%, respectivamente). A caminhada como forma de deslocamento foi associada com sexo feminino, classe econômica mais baixas (C, D e E) e percepção da disponibilidade da presença de faixa de pedestre. Para a caminhada no domínio lazer as variáveis pessoais e do ambiente que se associaram foram: idade (60 anos ou mais), classe econômica (B2, C, D e E), convite de amigos e/ou vizinhos para a prática. Os resultados apresentados demonstram que há uma associação entre a percepção do ambiente e a prática de caminhada no lazer e no deslocamento.

Ambiente percebido e sua associação com a atividade física total no lazer em adultos residentes no município de Rio Claro, SP

Introduction: Given the repercussion of the important role of physical activity in the prevention of sickness and non-communicable diseases / loss, many works have been done in order to understand the association of sociodemographic characteristics with sedentarism. The elements which influence the physical activity practice are countless. Besides the intrapersonal element, environment elements (social environment, cultural environment, public politics, information environment, natural environment etc.) are also important in the life style. Yet, the way that the person understands the environment can be considered in the planning of the strategies to change the sedentary behavior. Objective: Verify the association of the environment perception with the practice of physical activity (FA) at leisure time in adults living in Rio Claro – SP. Methodology: The sample consists of 470 adults, all residente in rio Claro-SP, aged ≥ 18 years old. The chosen participants answered to the questionnaires: Neighborhood Environmental Walkability Scale (NEWS), International Physical Activity (IPAQ) and to a specific questionnaire with personal data (age, sex, educational level, economical level, weight, height and marital status). The analysis of the connection between the variables was done through the Logistic Regression with Confidence Interval of 95%, using the software SPSS 17.0. Those who reached the recommendation of 10 minutes or more of physical activity in leisure time for week were classified as active, and those who did not reach the recommendation were classified as underactive. Results: The proportion of subjects who practiced physical activity in leisure time was 38,7%, and the male subjects, as well as those classified as better social level showed higher chances to practice at least 10 minutes weekly of physical activity during leisure. Still, walking the dog, soccer fields and gardens near the house (less than 10 walking minutes), were...

Depressão e apoio social percebido por mães de crianças hospitalizadas

This study was performed as a requirement of the final course in Nursing. The study is cross-cutting, in order to identify associations between socioeconomic factors, education, child hospitalization in the ICU or not, degree of depression and level of social support (material, affective, emotional, informational and positive social interaction) and how to identify subgroups of mother - child vulnerable. Constitute themselves as subjects, mothers of children 0 to 17 years, 11 months and 29 days in hospital after the second day of hospitalization in the pediatric unit of a State Hospital Interior Paulista. Data collection was initiated after obtaining the assent of the Research Ethics Committee, as well as signing the consent form. We used the following instruments to collect data: the data form for socioeconomic and hospitalization; Beck Depression Inventory and Medical Outcomes Study (MOS). We obtained the result that there is a strong association between availability and social support and income per capita and the degree of depression, but did not find an association between time and hospital stay and whether the child was admitted to the ICU or not. We conclude that it is necessary to establish treatment services from the patient’s family, plus an appropriate social service support to meet this big demand for mothers who need support

Validação de uma escala colorida de esforço percebido para adultas jovens e idosas em caminhada na esteira

The perceived exertion has been used for the intensity control and exercise prescription. Among the various scales that estimate the perceived exertion, the Borg’s RPE scale is one of the best known. However, for populations with low levels of schooling or with visual difficulties such as the elderly, the application of these scales becomes more difficult. In previous studies, a color scale of perceived exertion was developed to aim for assistance in application of the scale and interpretation of perceived exertion. This scale showed high correlation with the Borg’s scale and proved to be valid to estimate the perceived exertion. Thereby, the aim of this study was to assess the validity of the color scale of perceived exertion to measure the perceived exertion in adult women of different ages. Participated in the study 12 young adult women with age of 21,7 ± 1,5 years old, and 10 elderly women with age of 60,3 ± 3,5 years old. The participants were submitted to an incremental exercise of treadmill walking with stages of 2 minutes duration. The inicial load was 5,5 km/h and inclination of 6% for young women and 2% for elderly women, both with 2% increments at each stage completed, without changing the speed. Heart rate and oxygen comsuption responses were determined at the 30 finals seconds of each stage. At the 60 finals seconds of each stage participants indicated the perceived exertion for the overall body, for the legs and for the chest, primarily in the color scale and following in the tradicional Borg’s scale. The analysis of variance for repeated measures was used to assess the effect of different loads on the perceived exertion and physiological responses. The correlations betwen physiological variables, color scale and Borg’s scale were analyzed in group and individually. In all analysis the significance...(Complete abstract click electronic access below)

Escala de estresse percebido aplicada a estudantes universitárias: estudo de validação

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Desconforto percebido em condutores de veículos baja: parâmetros para o design ergonômico do assento

O Projeto Baja SAE Brasil envolve várias competições relativas ao desempenho de equipes quanto ao projeto dos veículos desenvolvidos. Dentre as várias provas, são avaliadas as condições ergonômicas do condutor. O presente estudo objetivou avaliar a percepção do desconforto antes e após a realização da prova “enduro”. Participaram condutores titulares de seis equipes e os resultados apontam que o design do assento dos veículos deve ser desenvolvido com base em parâmetros ergonômicos.