Cross-sectional Study of EMG and EMG Rise During Fast and Slow Hamstring Exercises
| Autor: | Thomas Bandholm, Kasper Krommes, Mette K Zebis, Per Hölmich, Kristian Thorborg, Markus D. Jakobsen, Lars L. Andersen, Anthony J. Shield |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
electromyography
medicine.medical_specialty Cross-sectional study Physical Therapy Sports Therapy and Rehabilitation Electromyography nordic hamstring Biceps Physical medicine and rehabilitation medicine Orthopedics and Sports Medicine rate of emg rise Leg curl hamstring strain injuries Original Research medicine.diagnostic_test business.industry Rehabilitation hamstring catches Hamstring exercises Sports medicine Motor unit recruitment Fatiguability business RC1200-1245 leg curl Hamstring |
| Zdroj: | Krommes, K, Jakobsen, M D, Bandholm, T, Andersen, L L, Zebis, M, Shield, A, Hölmich, P & Thorborg, K 2021, ' Cross-sectional Study of EMG and EMG Rise During Fast and Slow Hamstring Exercises ', International Journal of Sports Physical Therapy, vol. 16, no. 4 . https://doi.org/10.26603/001c.25364 International Journal of Sports Physical Therapy International Journal of Sports Physical Therapy, Vol 16, Iss 4 (2021) |
| DOI: | 10.26603/001c.25364 |
| Popis: | Background Hamstring injuries remain a major burden in football while the effective prevention exercise the Nordic Hamstring is poorly adopted, despite the added positive effects on performance. Better understanding of hamstring function during Nordic Hamstring compared to other exercises may provide better insight to the physiological adaptations of different types of hamstring curls. Purpose This cross-sectional study therefore aimed to compare the Nordic Hamstring curl with a conventional prone Leg Curl at different loads, and novel high velocity Hamstring Catches; in terms of peak normalized electromyographical activity (nEMG) and rate of electromyographic rise (RER) of Biceps Femoris long head, and angular velocity of the knee. Study design Cross-sectional study. Methods Out of 28 participants enrolled, the final sample included 23 recreationally active male participants who attended a session for determining RM (repetition maximum) to establish loading (8 and 16RM for Hamstring Catches, and 8, 16 and 24RM for Leg Curl) and to familiarize themselves with the three different exercises (Nordic Hamstring, Leg Curl and Hamstring Catch), and a testing session >4 days after during which EMG data were collected during 3 repetitions of each exercise performed in a random order. Results The Nordic Hamstring evoked higher RER (1091.8 nEMG/s) than Hamstring Catches (mean difference: 421 nEMG/s, p Conclusion The Nordic Hamstring displayed the highest level muscle activity and most explosive recruitment characteristics with early and high rate of electromyographic rise, compared to even high velocity exercises, thus providing a possible mechanism by which it may increase performance and reduce injuries. Levels of evidence 3 What is known about the subject Early phase force and muscle recruitment have been linked to both performance and hamstring-related inhibition and fatiguability. However, the potential for different hamstring exercises to elicit explosive recruitment is unknown. What this study adds to existing knowledge Early phase recruitment was higher and faster during the Nordic Hamstring exercise compared with conventional hamstring Leg Curl exercises with different loads and a high-velocity hamstring exercise. Clinical Relevance The surprisingly fast and explosive recruitment characteristics during the Nordic Hamstring exercise suggests the possibility that this exercise have the potential to improve the rate of force development and perhaps counter the effects of hamstring-related inhibition and fatigue. |
| Databáze: | OpenAIRE |
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