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Kettlebell swing targets semitendinosus and supine leg curl targets biceps femoris: an EMG study with rehabilitation implications
  1. Mette Kreutzfeldt Zebis1,2,
  2. Jørgen Skotte3,
  3. Christoffer H Andersen3,
  4. Peter Mortensen3,
  5. Højlund H Petersen4,
  6. Tine C Viskær4,
  7. Tanja L Jensen4,
  8. Jesper Bencke2,
  9. Lars L Andersen3
  1. 1Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark
  2. 2Gait Analysis Laboratory, Hvidovre Hospital, Hvidovre, Denmark
  3. 3National Research Centre for the Working Environment, Copenhagen, Denmark
  4. 4School of Physiotherapy, Copenhagen, Denmark
  1. Correspondence to Mette Kreutzfeldt Zebis, University of Southern Denmark, Institute of Sports Science and Clinical Biomechanics, Campusvej 55 DK-5230, Odense, Denmark; mettezebis{at}hotmail.com

Abstract

Background The medial hamstring muscle has the potential to prevent excessive dynamic valgus and external rotation of the knee joint during sports. Thus, specific training targeting the medial hamstring muscle seems important to avoid knee injuries.

Objective The aim was to investigate the medial and lateral hamstring muscle activation balance during 14 selected therapeutic exercises.

Study design The study design involved single-occasion repeated measures in a randomised manner. Sixteen female elite handball and soccer players with a mean (SD) age of 23 (3) years and no previous history of knee injury participated in the present study. Electromyographic (EMG) activity of the lateral (biceps femoris – BF) and medial (semitendinosus – ST) hamstring muscle was measured during selected strengthening and balance/coordination exercises, and normalised to EMG during isometric maximal voluntary contraction (MVC). A two-way analysis of variance was performed using the mixed procedure to determine whether differences existed in normalised EMG between exercises and muscles.

Results Kettlebell swing and Romanian deadlift targeted specifically ST over BF (Δ17–22%, p<0.05) at very high levels of normalised EMG (73–115% of MVC). In contrast, the supine leg curl and hip extension specifically targeted the BF over the ST (Δ 20–23%, p<0.05) at very high levels of normalised EMG (75–87% of MVC).

Conclusion Specific therapeutic exercises targeting the hamstrings can be divided into ST dominant or BF dominant hamstring exercises. Due to distinct functions of the medial and lateral hamstring muscles, this is an important knowledge in respect to prophylactic training and physical therapist practice.

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Footnotes

  • Competing interests None.

  • Patient consent Obtained.

  • Ethics approval The study was approved by the local ethical committee (HC2008103).

  • Provenance and peer review Not commissioned; externally peer reviewed.

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