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- W2917091566 abstract "Abstract Objective: The aerobic fitness on predicting firefighters’ air consumption time from self-contained breathing apparatus (T_SCBA) during physical task was investigated. Methods: Twenty firefighters were divided in two groups: G1 (n=10; 28.0±3.1 years) for the generation of a predictive equation of T_SCBA and G2 (n=10; 25.4±2.3 years) for the validation of the predictive equation. The groups completed two performance tests in separate days: 1) maximal 1600m running in order to determine mean velocity (1600mV) and maximal heart rate; 2) submaximal running/walking at intensity between 88–92% of the maximal heart rate. In second test, the firefighters were equipped with protective clothing (boots, gloves, cape, helmet and balaclava) and the self-contained breathing apparatus. The T_SBCA (corresponding to 1020 liters of pressurized air), blood lactate, heart rate and rate of perceived exertion were measured. Results: The linear regression of G1 (T_SCBA vs. 1600mV) resulted in the following predictive equation: T_SCBA= 0.0442*1600mV (m.min-1) + 4.5029 (r= 0.85; SEE= 0.73; p<0.001). When analyzing in G2, the measured and predicted T_SCBA using the equation generated in G1, no significant differences were found (T_SCBA measured= 15.5±2.5 min vs. T_SCBA predicted= 14.7±0.4 min; p=0.21). High correlation (r=0.95; SEE= 0.79; p<0.001) and agreement of the difference of the means (0.9 min [-3.1/+4.8]) were also found. Conclusion: Aerobic fitness presented high correlation with T_SCBA. In addition, the proposed predictive equation was considered valid to estimate T_SCBA during physical task of firefighters, which can have practical application in the labor activity of this population. Resumen Objetivo: Investigar la capacidad aeróbica como factor de predicción del tiempo de consumo de aire de un equipo de respiración autónoma (T_ERA) durante la realización de tareas físicas de bomberos. Método: Veinte bomberos se dividieron en dos grupos: G1 (n=10; 28.0±3.1 años) para la generación de la ecuación predictiva de T_ERA y G2 (n=10; 25.4±2.3 años) para la validación de la ecuación predictiva. Los grupos completaron dos test en días separados: 1) 1600m de carrera máxima para determinar la velocidad media (1600mV) y la frecuencia cardiaca máxima; 2) carrera submáxima/caminata a una intensidad entre el 88-92% de la frecuencia cardiaca máxima. En el segundo test, los bomberos usaron su ropa de protección (botas, guantes, capa, casco y pasamontañas) y el equipo de respiración autónomo. Se midió: el T_ERA (correspondiente a 1020 litros de aire presurizado), el lactato en sangre, la frecuencia cardiaca y el índice de esfuerzo percibido. Resultados: La regresión lineal del G1 (T_ERA vs. 1600mV) resultó en la siguiente ecuación predictiva: T_ERA= 0.0442*1600mV (m.min-1) + 4.5029 (r= 0.85; EEE= 0.73; p<0.001). Cuando se analizó el G2, no se encontraron diferencias significativas entre el valor de T_ERA medido y el calculado usando la ecuación generada con el G1 (T_ERA medido= 15.5±2.5 min vs. T_ERA calculado= 14.7±0.4 min; p=0.21). Se encontró una alta correlación (r=0.95; EEE= 0.79; p<0.001) y concordancia con la diferencia de las medias (0.9 min [-3.1/+4.8]). Conclusión: La capacidad aeróbica presentó una alta correlación con el T_ERA. Además, la ecuación de predicción propuesta se consideró válida para estimar el T_ERA durante tareas físicas de bomberos, lo que tiene grandes aplicaciones prácticas en la labor de esta población. Resumo Objetivo: Investigar a aptidão aeróbia na predição do tempo de consumo de ar durante tarefa física de bombeiros a partir do equipamento de proteção respiratória (T_EPR). Método: Vinte bombeiros foram divididos em dois grupos: G1 (n=10; 28.0±3.1 anos) para geração da equação preditiva do T_EPR e G2 (n=10; 25.4±2.3 anos) para validação da equação preditiva. Os grupos realizaram dois testes de desempenho em dias distintos: 1) 1600m de corrida em máxima intensidade para determinar a velocidade média (Vm1600) e a frequência cardíaca máxima; 2) corrida/caminhada em intensidade submáxima entre 88–92% da frequência cardíaca máxima. No segundo teste, os bombeiros estavam equipados com roupa de proteção (botas, luvas, capa, capacete e balaclava) e equipamento de proteção respiratória. O T_EPR (correspondente a 1020 litros de ar pressurizado), lactate sanguíneo, frequência cardíaca e percepção subjetiva de esforço foram mensurados. Resultados: A regressão linear do G1 (T_EPR vs. Vm1600) resultou na seguinte equação de predição: T_EPR= 0.0442*Vm1600 (m.min-1) + 4.5029 (r= 0.85; EPM= 0.73; p<0.001). Quando analizado em G2, o T_EPR medido e predito a partir da equação gerada em G1, não foi encontrada diferença significante (T_EPR medido= 15.5±2.5 min vs. T_EPR predito= 14.7±0,4 min; p=0.21). Alta correlação (r=0.95; EPM= 0.79; p<0.001) e concordância na média das diferenças (0.9 min [-3.1/+4.8]) também foi encontrada. Conclusão: A aptidão aeróbia apresentou alta correlação com o T_EPR. Em adicional, a equação preditiva proposta foi considerada valida em estimar o T_EPR durante tarefa física de bombeiros, o que pode ter aplicação prática na atividade laboral dessa população." @default.
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- W2917091566 date "2019-01-28" @default.
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- W2917091566 title "Aerobic fitness predicts the air consumption time in the self-contained breathing apparatus during physical task of firefighters" @default.
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