Introduction: The Samsung company was first who develop their own app S Health, which allows users to manage their activity, diet, stress data, heart rate and sleep by capturing and tracking informations and measurements via a smartphone. S Health provides informations about physical activity related to burned calories, measured distance, and number of steps taken during the activity. Purpose: We wanted to find out the compatibility of Samsung's three phones, ranged by price, with their app for step counting S Health, which we also installed on two phones generation 2016 (Samsung and Huawei), and compared all the results with the Step Watch pedometer. We also determined the consistency of the results in three activities: walking on short distance, walking on long distance and stair walking. Methods: Twenty-two subjects participated in three walking tests - the Twenty Step Test, the Stair Walk Test, and the Six Minute Walk Test. During the tests, the telephones were all at the same tome and in a random order inserted into a waist bag at the height of the hips and in the midline of the right thigh. The Step Watch pedometer was mounted on the ankle. Results: In the Test of twenty steps, the phones had an error in range from 5,79% to 56,9%. The phone from highest price rang was the only one with a poor correlation (r = 0.34) in comparison with the pedometer results, all other phones had negligible (0.0-0.1), and it was the only one who didn`t record zero in any measurement. In the Stair walking test, the phone from highest price rang was the only one which had an error less than five percent (1.9%). Phone A had the only one a very high correlation with the pedometer (r = 0.84), all other phones had low or medium (0.26 -0.38) and it was the only one who didn`t record zero in any measurement. In the Six-minute walk test, the phone from higher price rang was the only one which had an error less than five percent (1.14%), it has nearly perfect correlation (r = 0.98) compared to the pedometer results, all other phones had the middle one (0.42- 0.48). No phone recorded a value of 0 in this test. Discussion and conclusion: We have found more accurate results for phone from highest price rang compared to phones from lower prices rang, regardless of the length of the walk or the terrain of straight or stairs. There were no differences between phones of different generations. Accuracy and consistency between the pedometer and telephones increased as the number of steps increased or the measurement duration increased.
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