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Previous studies have used an accelerometer to evaluate muscle endurance. This study compared endurance index values using a video phone to an accelerometer. Eleven healthy subjects (19-22yrs) were electrically stimulated for 5 minutes at 5 Hz on the hamstring muscles. Four 10s videos were captured at 1080p and 60fps (~283,000 pixels) with the phone. Videos were analyzed using sequential correlations (consecutive 1-2, or consecutive skipping an image 1–3) of the video images between the electrodes. The magnitude of the decrease in the correlation was used to indicate movement. A triaxial accelerometer measured the resultant vector of the movements and the decrease in acceleration was used to indicate fatigue. Analysis using 1-3 produced higher delta R2 values compared to 1-2 (0.038+0.004; 0.020+0.001). Endurance index was 72.1+19.4% for the accelerometer and 71.1+18.6% for the phone images, p=0.64. The mean difference between the methods was not different from zero and the 90% confidence interval was within 5%. In conclusion, the consecutive correlations method detected decreases in movement due to fatigue. The video method provided equivalent values to the previously established accelerometer method to measure muscle endurance. These results support the use of video to assess muscle acceleration during muscle specific endurance test.
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