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Influence of different ranges of motion on selective recruitment of shoulder muscles in the sitting military press: an electromyographic study.
J Strength Cond Res. 2010 Jun; 24(6):1578-83.JS

Abstract

Popular fitness literature suggests that varying the elbow range of motion (ROM) during the Military press can lead up to specific muscle isolation especially for deltoid and trapezius muscles. The purpose of the study was to examine the effect of ROM at different loads on the electromyographic (EMG) activity of 8 preselected muscles. Six experienced lifters performed 3 sets of 10 repetitions, each one with a different ROM: the first one with a final elbow angle of 90 degrees (R1); the second with 135 degrees (R2), and the last one with a final elbow angle of 180 degrees (R3). Three resistances were chosen (no load, 30% of one repetition maximum [1-RM], and 70% of 1-RM), and sets were separated by 5 minutes rest. Electromyographic surface electrodes were placed on the clavicular head of pectoralis major, anterior deltoid, medial deltoid (MD), posterior deltoid (PD), upper trapezius, middle trapezius (MT), long head of triceps, and teres minor (TM). Analysis of variance showed a significant increase of rmsEMG activation with the widest ROM for each muscle and for each load condition except in MT and TM and PD with no load. The results showed that the use of the widest ROM increased the EMG activity of all the muscles selected with respect to the closest one, whereas this effect is not totally confirmed with the employment of R2. In addition, the use of intermediate ROMs was able to isolate the activity of the MD with respect to the trapezius only in the condition of the heaviest load. This suggests to coaches that in strength development programs the employment of an incomplete ROM can reduce the involvement of the trapezius without decreasing medium deltoid activation only with heavy loads.

Authors+Show Affiliations

Department of Human Anatomy and Physiology, Section of Physiology, University of Padova, Padova, Italy. antonio.paoli@unipd.itNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

20508462

Citation

Paoli, Antonio, et al. "Influence of Different Ranges of Motion On Selective Recruitment of Shoulder Muscles in the Sitting Military Press: an Electromyographic Study." Journal of Strength and Conditioning Research, vol. 24, no. 6, 2010, pp. 1578-83.
Paoli A, Marcolin G, Petrone N. Influence of different ranges of motion on selective recruitment of shoulder muscles in the sitting military press: an electromyographic study. J Strength Cond Res. 2010;24(6):1578-83.
Paoli, A., Marcolin, G., & Petrone, N. (2010). Influence of different ranges of motion on selective recruitment of shoulder muscles in the sitting military press: an electromyographic study. Journal of Strength and Conditioning Research, 24(6), 1578-83. https://doi.org/10.1519/JSC.0b013e3181d756ea
Paoli A, Marcolin G, Petrone N. Influence of Different Ranges of Motion On Selective Recruitment of Shoulder Muscles in the Sitting Military Press: an Electromyographic Study. J Strength Cond Res. 2010;24(6):1578-83. PubMed PMID: 20508462.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of different ranges of motion on selective recruitment of shoulder muscles in the sitting military press: an electromyographic study. AU - Paoli,Antonio, AU - Marcolin,Giuseppe, AU - Petrone,Nicola, PY - 2010/5/29/entrez PY - 2010/5/29/pubmed PY - 2010/9/15/medline SP - 1578 EP - 83 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 24 IS - 6 N2 - Popular fitness literature suggests that varying the elbow range of motion (ROM) during the Military press can lead up to specific muscle isolation especially for deltoid and trapezius muscles. The purpose of the study was to examine the effect of ROM at different loads on the electromyographic (EMG) activity of 8 preselected muscles. Six experienced lifters performed 3 sets of 10 repetitions, each one with a different ROM: the first one with a final elbow angle of 90 degrees (R1); the second with 135 degrees (R2), and the last one with a final elbow angle of 180 degrees (R3). Three resistances were chosen (no load, 30% of one repetition maximum [1-RM], and 70% of 1-RM), and sets were separated by 5 minutes rest. Electromyographic surface electrodes were placed on the clavicular head of pectoralis major, anterior deltoid, medial deltoid (MD), posterior deltoid (PD), upper trapezius, middle trapezius (MT), long head of triceps, and teres minor (TM). Analysis of variance showed a significant increase of rmsEMG activation with the widest ROM for each muscle and for each load condition except in MT and TM and PD with no load. The results showed that the use of the widest ROM increased the EMG activity of all the muscles selected with respect to the closest one, whereas this effect is not totally confirmed with the employment of R2. In addition, the use of intermediate ROMs was able to isolate the activity of the MD with respect to the trapezius only in the condition of the heaviest load. This suggests to coaches that in strength development programs the employment of an incomplete ROM can reduce the involvement of the trapezius without decreasing medium deltoid activation only with heavy loads. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/20508462/Influence_of_different_ranges_of_motion_on_selective_recruitment_of_shoulder_muscles_in_the_sitting_military_press:_an_electromyographic_study_ L2 - https://doi.org/10.1519/JSC.0b013e3181d756ea DB - PRIME DP - Unbound Medicine ER -