Electromyographical Differences Between the Hyperextension and Reverse-Hyperextension

• Cuthbert, Matthew ^[1] ; Ripley, Nicholas J. ^[1] ; Suchomel, Timothy J. ^[1] ; Alejo, Robert ^[3] ; McMahon, John J. ^[1] ; Comfort, Paul ^[2]
  1. [1] University of Salford

     University of Salford

     Reino Unido

     
  2. [2] Edith Cowan University

     Edith Cowan University

     Australia

     
  3. [3] California State University Northridge

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• Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 35, Nº. 6, 2021, págs. 1477-1483
• Idioma: inglés
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• Resumen

  • The aims of this study were to compare muscle activation of the erector spinae (ES), gluteus maximus (GMax), and biceps femoris (BF) during the hyperextension (HE) and reverse-HE (RHE) exercises. Ten subjects (age, 23 +/- 4 years; height, 175.9 +/- 6.9 cm; mass, 75.2 +/- 9.7 kg) had electromyography (EMG) electrodes placed on the ES, GMax, and BF muscles in accordance with SENIAM (Surface EMG for Non-Invasive Assessment of Muscles) guidelines. Subjects performed 3 maximum voluntary isometric contraction trials of lumbar extension and hip extension using a handheld and isokinetic dynamometer, respectively, to normalize the EMG during the HE and RHE exercises. Three repetitions of each exercise were executed in a randomized order. High reliability (intraclass correlation coefficient >=0.925) was observed with low variability (coefficient of variation [CV] < 10%) in all but the GMax during the extension phase of the HE (CV = 10.64%). During the extension and flexion phases, the RHE exhibited significantly greater (p <= 0.024; 34.1-70.7% difference) peak EMG compared with the HE in all muscles tested. Similarly, the RHE resulted in significantly greater mean EMG compared with the HE (p <= 0.036; 28.2-65.0% difference) in all muscles except the BF during the flexion phase (p = 9.960). Therefore, the RHE could be considered as a higher-intensity exercise for the posterior chain muscles compared with the HE, potentially eliciting greater increases in strength of the posterior chain muscles.