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Abstract

Blood flow restriction (BFR) training has acquired significant attention in rehabilitation and performance sciences. Polar is a popular heart rate (HR) device manufacturer, Polar Electro OY. PURPOSE: The purpose of this study was to investigate the validity of HR from the Polar Verity Sense biceps band vs the Polar H10 chest strap during a hand grip assessment with blood flow restriction. METHODS: Twenty-three adults (9 females, 14 males, Identified otherwise n = 0; age=24.74±8.19 years, height = 172 cm (SD =9) Mass = 79kg (SD= 18.5) were recruited via convenience sampling. Participants were asked to do a warm-up including 5-min rowing followed by a sponge grip test (75 reps across 4 sets) while using the SmartCuff BFR device on their arms to create a blood flow restriction (50% occlusion). After the warm-up a hand grip strength test was done while wearing a Polar Verity Sense on the BFR arm and the arm that was not occluded (Non-BFR). Average and maximum HR were recorded for analysis. Mean Absolute Percent Error (MAPE) and Lins Concordance Correlation Coefficient( CCC) were used to assess validity: MAPE ≤ 5% and CCC ≥ 0.90. RESULTS: The Polar Verity Sense met the threshold for average HR in both arms (BFR MAPE=3.9%, BFR CCC=0.92; Non-BFR MAPE=2.6%, Non-BFR CCC=0.96) but for max HR only in the non-occluded arm (Non-BFR MAPE=3.5%, Non-BFR CCC=0.94; BFR MAPE=12.3%, BFR CCC=0.94). CONCLUSION These results specify that in the present study, the Polar Verity Sense was accurate for measuring average HR but that BFR affects maximal HR accuracy in the occluded limb.

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