Comparison of EMG activity of medial and lateral hamstrings during isometric contractions at various cuff weight loads

The Knee
I M FiebertL Raper

Abstract

Since both the medial head (MH) and lateral head (LH) of the hamstring muscles contribute to knee flexion, this study investigated whether the relative electrical activity of these heads remained constant with respect to each other or changed during isometric contractions at five different resistance levels. The relative electrical activity of these two heads was determined by comparing their integrated EMG (iEMG). Forty-two volunteers with no history of right lower extremity injury or disease, between the ages of 18 and 35, were studied. Following motor point location, surface electrodes were placed over the MH and LH. Subjects, positioned prone, flexed the knee to 45 degrees using a sawhorse as a tactile cue to help maintain this position. Three recordings, 8 s in length, were taken at each subject's maximum isometric contraction and then using cuff weights of 1, 3, 5, and 7% of their body weight. The average of the three recordings was used in the analysis. During maximum isometric contraction (at 45 degrees of knee flexion), the LH contributes a significantly greater percent of the total iEMG (63.4%) than the MH (P < 0.0001). Furthermore, within the four submaximal levels tested, the LH's contribution was significantly grea...Continue Reading

References

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Citations

Oct 9, 2009·Medicine and Science in Sports and Exercise·Robert M CampyDanny M Pincivero
Sep 24, 2014·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·K BriemT Sveinsson
May 9, 2012·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Eleftherios KellisKonstantinos Natsis
Oct 24, 2006·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Eleftherios Kellis, Athanasios Katis
Oct 12, 2013·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Massimo G BarcellonaAndrew A Amis
May 4, 2021·Journal of Back and Musculoskeletal Rehabilitation·Wootaek Lim
Jul 13, 2021·Journal of Back and Musculoskeletal Rehabilitation·Min-Joo KoMin-Hyeok Kang

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