The effects of shoulder joint abduction angles on the muscle activity of the serratus anterior muscle and the upper trapezius muscle while vibrations are applied

Jung, Dae Soo; Moon, Dong-Chul

doi:10.1589/jpts.27.117

Cited by 8 publications

(7 citation statements)

References 14 publications

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“…Previous studies have shown that shoulder joint positions could affect muscle activation 25 , 26 , 27 ) around the shoulder and the shoulder’s rotational strength 14 , 15 , 18 ) . The present study also found that the ER and IR strengths of the shoulder changed with the shoulder abduction angles in the scapular plane.…”

Section: Discussionmentioning

confidence: 99%

The changes in shoulder rotation strength ratio for various shoulder positions and speeds in the scapular plane between baseball players and non-players

Lin

Lee

et al. 2015

J Phys Ther Sci

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[Purpose] This study aimed to investigate the effect of shoulder positions and speeds on internal and external rotation torque of college baseball players and age-matched non-players. [Subjects] Twenty first-level collegiate baseball players and 19 college students were recruited. [Methods] A dynamometer system was used to evaluate the shoulder rotation strength in sitting postures. Three testing positions, namely shoulder abduction of 45°, 70°, and 90° in the scapular plane, were combined with three testing speeds at 60°/s, 120°/s, and 210°/s. [Results] The maximum external and internal rotation torques both occurred at shoulder abduction of 70°. However, only external rotation torque was affected by the speed, with the peak value observed at 60°/s. The internal rotation torque of baseball players was larger than that of the control group under all testing conditions, but the external rotation did not show any difference. The ratio of external to internal rotation torque changed with the testing positions and speeds in both groups. The ratio in the control group was greater than that in the player group. [Conclusion] The shoulder position could affect the rotational strength, and the baseball players could strengthen their external rotators for better performance and injury prevention.

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Section: Discussionmentioning

confidence: 99%

The changes in shoulder rotation strength ratio for various shoulder positions and speeds in the scapular plane between baseball players and non-players

Lin

Lee

et al. 2015

J Phys Ther Sci

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show abstract

“…Subjects were then instructed, with their arm raised in the same measured position, to resist a downward force of 5 pounds applied to the humerus with a hand-held dynamometer (Lafayette Instrument Co) by an experimenter, to achieve MVIC. (Figures 4, 5) Manual resistance at a shoulder abduction angle of about 120 degrees has been shown to achieve higher serratus anterior activation than other MVIC positions (Jung and Moon, 2015).…”

Section: [ Figure 3 ]mentioning

confidence: 91%

Peer Review #1 of "Surface electromyographic analysis of differential effects in kettlebell carries for the serratus anterior muscles (v0.1)"

Lodato¹

2018

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The purpose of this study was to examine differences in the Electromyography (EMG) amplitude of the serratus anterior between forty-five degree kettlebell carries and ninety degree kettlebell carries. Thirty-three men aged roughly between 19-23 and who were either college or professional baseball pitchers were chosen and randomly assigned to either perform the forty-five degree kettlebell carry followed by the ninety degree kettlebell carry (n=17) or the ninety degree kettlebell carry followed by the forty five degree kettlebell carry (n=16). Each pitcher was instructed in the proper usage of the exercise and assigned a short break between the two carries. Changes in EMG amplitude were examined after proper band-pass filtering, normalization, and moving averagesmoothing of the raw EMG signal. Differences of the EMG amplitude mean frequencies were examined between each subject's individual carries and the clumped groups of all forty-five and ninety degree carries. Among each individual comparison, eight pitchers had "large" Effect Size differences between the EMG amplitudes of their two carries, with seven of them signaling the forty-five degree carry as the larger value. In addition, when examining the grouped mean differences of the EMG amplitudes, we found the forty-five degree carries to be significantly higher (p-value of 0.018).

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“…4 and 5 ). Manual resistance at a shoulder abduction angle of about 120° has been shown to achieve higher serratus anterior activation than other MVIC positions ( Jung & Moon, 2015 ).…”

Section: Methodsmentioning

confidence: 99%

Surface electromyographic analysis of differential effects in kettlebell carries for the serratus anterior muscles

Caravan

Scheffey

Briend

et al. 2018

PeerJ

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The purpose of this study was to examine differences in the Electromyography (EMG) amplitude of the serratus anterior between 45° kettlebell carries and 90° kettlebell carries. Thirty-three men aged roughly between 19 and 23 and who were either college or professional baseball pitchers were chosen and randomly assigned to either perform the 45° kettlebell carry followed by the 90° kettlebell carry (n = 17) or the 90° kettlebell carry followed by the 45° kettlebell carry (n = 16). Each pitcher was instructed in the proper usage of the exercise and assigned a short break between the two carries. Changes in EMG amplitude were examined after proper band-pass filtering, normalization, and moving average-smoothing of the raw EMG signal. Differences of the EMG amplitude mean frequencies were examined between each subject’s individual carries and the clumped groups of all 45° and 90° carries. Among each individual comparison, eight pitchers had “large” Effect Size differences between the EMG amplitudes of their two carries, with seven of them signaling the 45° carry as the larger value. In addition, when examining the grouped mean differences of the EMG amplitudes, we found the 45° carries to be significantly higher (p-value of 0.018).

show abstract

The effects of shoulder joint abduction angles on the muscle activity of the serratus anterior muscle and the upper trapezius muscle while vibrations are applied

Cited by 8 publications

References 14 publications

The changes in shoulder rotation strength ratio for various shoulder positions and speeds in the scapular plane between baseball players and non-players

The changes in shoulder rotation strength ratio for various shoulder positions and speeds in the scapular plane between baseball players and non-players

Peer Review #1 of "Surface electromyographic analysis of differential effects in kettlebell carries for the serratus anterior muscles (v0.1)"

Surface electromyographic analysis of differential effects in kettlebell carries for the serratus anterior muscles

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