CONCORDÂNCIA ENTRE DOPPLER PORTÁTIL E OXÍMETRO DE PULSO NA DETERMINAÇÃO DA PRESSÃO ARTERIAL DE OCLUSÃO DE JOVENS SAUDÁVEIS.

Abstract

Introduction: The determination of the arterial occlusion of pressure (AOP) is a critical measurement for selection of adequate pressures to the BFR method. Effective restriction pressures (usually 40-50% of the AOP) could be selected to be used in association with muscle contractions against minor resistance, when the main purpose is gaining mass. Recently doppler hand-held equipment have been utilized for such purpose, on the other hand, pulse oximeter has been largely utilized in the clinical practice for monitoring the hemoglobin saturation and the blood flow inside the capillary bed, via laser diode sensors. Both methods are capable to detect the presence or absence of blood flow but they never have been tested before, in regards to its use to predict the AOP. Objective: Verify the agreement between doppler and pulse oximeter occlusion in measuring arterial occlusion pressure. Materials Methods: The sample consisted of 70 subjects (37 women and 33 men), aged 18 to 33 years. The assessments were made in a single session composed by anthropometric measures, response to Physical Activity Readiness Questionnaire (PAR-Q) and International Physical Activity Questionnaire (IPAQ) followed for the blinded and simultaneously determination of arterial occlusion pressure with doppler and pulse oximeter in the siting, standing and lying positions. Results: The results showed an excellent agreement Kappa between methods in the three positions analyzed, seated, standing and lying, respectively (0.963, 0.967, 1.00) and very strong Spearman’s correlation (rs= 0.997, 0.992, 0,993). Discussion: Arterial occlusion pressure (AOP) measure is determinant for the effectiveness and safety execution of blood flow restriction protocols associated or not with exercise. Currently the literature available suggest the use of doppler handheld for the precise measurement of AOP however it’s a hospital equipment with specific technical manipulations demands, a higher cost besides depends to the specific moment of silencing arterial pulse which could be very hard in many times. In instance we propose the use of the pulse oximeter, a lower cost and easier to manipulate equipment that show an excellent agreement with the gold standard to access the AOP, making possible to coaches in physical education and all community the use of methods of blood flow restriction on non-laboratory environments. Conclusion: The pulse oximeter has been shown to be effective in comparison to doppler handheld to access the AOP. It can be adopted as an instrument to facilitate the achievement of this measure in academic, professional and leisure environments allowing the practice of techniques of blood flow restriction even safer, more efficient and accessible.