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Abstract
Twitch acceleration has been used to measure muscle endurance. PURPOSE: To evaluate the use of consecutive correlation to measure muscle acceleration twitch contractions in ultrasound videos. METHODS: Thirty-five healthy, able bodied participants were tested on one occasion. Surface electrodes and a triaxial accelerometer were placed over the hamstring muscles. The stimulation occurred for 5 minutes at five Hz. B-mode ultrasound images were recorded analyzed using a developed analysis program consisting of correlational methods. RESULTS: Optimization of consecutive correlations favored the 1:3 over the 1:2 sequence (R2 of 0.05±0.05 versus 0.03±0.01, p =0.001). No relationship between ultrasound endurance index and accelerometer index was found (R2 < 0.01, p = 0.5). CONCLUSION: We were able to successfully develop and test the parameters of an analysis program, however we could not accept our hypothesis that ultrasound index and accelerometer index were similar.