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Kettlebell swing targets semitendinosus and supine leg curl targets biceps femoris: an EMG study with rehabilitation implications.
Br J Sports Med. 2013 Dec; 47(18):1192-8.BJ

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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Authors+Show Affiliations

Zebis MK
Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark.
Skotte J
No affiliation info available
Andersen CH
No affiliation info available
Mortensen P
No affiliation info available
Petersen HH
No affiliation info available
Viskaer TC
No affiliation info available
Jensen TL
No affiliation info available
Bencke J
No affiliation info available
Andersen LL
No affiliation info available

MeSH

Biomechanical PhenomenaElectromyographyExerciseExercise TherapyFemaleHumansIsometric ContractionLower ExtremityMovementMuscle StrengthMuscle, SkeletalPostural BalanceRange of Motion, ArticularSupine PositionYoung Adult

Pub Type(s)

Journal Article

Language

eng

PubMed ID

22736206

Citation

Zebis, Mette Kreutzfeldt, et al. "Kettlebell Swing Targets Semitendinosus and Supine Leg Curl Targets Biceps Femoris: an EMG Study With Rehabilitation Implications." British Journal of Sports Medicine, vol. 47, no. 18, 2013, pp. 1192-8.
Zebis MK, Skotte J, Andersen CH, et al. Kettlebell swing targets semitendinosus and supine leg curl targets biceps femoris: an EMG study with rehabilitation implications. Br J Sports Med. 2013;47(18):1192-8.
Zebis, M. K., Skotte, J., Andersen, C. H., Mortensen, P., Petersen, H. H., Viskaer, T. C., Jensen, T. L., Bencke, J., & Andersen, L. L. (2013). Kettlebell swing targets semitendinosus and supine leg curl targets biceps femoris: an EMG study with rehabilitation implications. British Journal of Sports Medicine, 47(18), 1192-8. https://doi.org/10.1136/bjsports-2011-090281
Zebis MK, et al. Kettlebell Swing Targets Semitendinosus and Supine Leg Curl Targets Biceps Femoris: an EMG Study With Rehabilitation Implications. Br J Sports Med. 2013;47(18):1192-8. PubMed PMID: 22736206.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Kettlebell swing targets semitendinosus and supine leg curl targets biceps femoris: an EMG study with rehabilitation implications. AU - Zebis,Mette Kreutzfeldt, AU - Skotte,Jørgen, AU - Andersen,Christoffer H, AU - Mortensen,Peter, AU - Petersen,Højland H, AU - Viskaer,Tine C, AU - Jensen,Tanja L, AU - Bencke,Jesper, AU - Andersen,Lars L, Y1 - 2012/06/26/ PY - 2012/6/28/entrez PY - 2012/6/28/pubmed PY - 2014/7/10/medline SP - 1192 EP - 8 JF - British journal of sports medicine JO - Br J Sports Med VL - 47 IS - 18 N2 - 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. SN - 1473-0480 UR - https://www.unboundmedicine.com/medline/citation/22736206/Kettlebell_swing_targets_semitendinosus_and_supine_leg_curl_targets_biceps_femoris:_an_EMG_study_with_rehabilitation_implications_ L2 - https://bjsm.bmj.com/lookup/pmidlookup?view=long&amp;pmid=22736206 DB - PRIME DP - Unbound Medicine ER -