Activation of shoulder muscles in healthy men and women under isometric conditions

Anders, C.; Bretschneider, Susanne; Bernsdorf, Annette; Erler, Kerstin; Schneider, Wilhelm

doi:10.1016/j.jelekin.2004.04.003

Cited by 62 publications

(44 citation statements)

References 24 publications

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“…In the literature, most authors find no statistically significant difference in muscle fiber compositions between genders [26]. In this study, male and female subjects show consistency with the regularity of variation of median frequency (MNF).…”

Section: Discussionsupporting

confidence: 77%

The Surface EMG Characteristics between Erector Spinae and Vastus Lateralis during Bending Forward and Squatting Down Tasks

et al. 2015

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Bending forward and squatting down are two common physical tasks in everyday life and at work. This study determined the sEMG characteristics between erector spinae and vastus lateralis during bending forward and squatting down tasks by analyzing the regularity of variation in sEMG frequency domain index-median frequency (MNF) in healthy subjects. The results indicate that sEMG activities in erector spinae are significantly higher than those in the right vastus lateralis during bending forward task. Instead, in squatting down task, sEMG activities in the right vastus lateralis are significantly greater than those in erector spinae. It also shows that the fatigue degree of low back caused by trunk bending is much deeper than that by squatting down. The ratio scope of one-order fitting values of MNF between erector spinae and vastus lateralis ranges from 0.87 to 1.72 among 80% of subjects during bending forward task and ranges from 0.31 to 1.11 during squatting down task. This study provides certain theoretical basis for using the strength of low back in a proper way to avoid getting it hurt in daily physical activities.

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Section: Discussionsupporting

confidence: 77%

The Surface EMG Characteristics between Erector Spinae and Vastus Lateralis during Bending Forward and Squatting Down Tasks

et al. 2015

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“…In an earlier surface EMG (SEMG) investigation, we found diVerent shoulder muscle co-ordination patterns in women as compared to men (Anders et al 2004). Since shoulder anatomy does not diVer between genders (Bonsell et al 2000) this result argues for diVerent strategies: women tended to use stabilizing and also antagonist muscles more in comparison to men.…”

Section: Introductionmentioning

confidence: 75%

Gender specific activation patterns of trunk muscles during whole body tilt

et al. 2007

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Gender specific differences as evidenced in both anthropometric data and physical performance of healthy persons have been broadly demonstrated. Recently advancements in surface electromyography (SEMG) have shown possible differences in men's and women's muscle coordination patterns. However, quantitative information about gender related muscle co-ordination patterns are rare. This investigation was carried out to both verify if trunk muscle SEMG amplitude-force relationship differs between men and women and refine techniques of measurement and data analysis using SEMG. Thirty-one healthy volunteers (16 women, 15 men) were investigated during whole body tilt at angles from 5 degrees to 90 degrees (from quasi vertical to horizontal position). Subjects had to maintain body in body axis while their lower body was fixed and the upper body remained unsupported. SEMG was taken from five different trunk muscles of both sides simultaneously. At corresponding tilt angles women exhibited higher amplitude levels of their abdominal muscles in comparison to men, who were characterized by higher back muscle amplitudes. Abdominal muscles showed a non-linear SEMG amplitude-force relationship but differed between genders with more linearity in women. Back muscles showed a linear amplitude-force relationship with no differences between genders. Women were characterized by higher levels of co-contraction of all investigated muscles. The data are in accordance with histological investigations, which already proved specific fiber distribution patterns in both abdominal and back muscles and gender related differences in relative area of Type 1 fibers of back muscles. The observed differences in SEMG-force relationship for the abdominal muscles remain hypothetical because of lack of histological information.

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“…The scapula and humerus are stabilized by muscle activation. A difference has been shown between healthy men and women in shoulder muscle activation, with men exhibiting superior muscle activation in the main force direction 21) . It is suggested that weaker muscle strength in women than in men may result in greater joint laxity 15,22) .…”

Section: Discussionmentioning

confidence: 99%

Analysis of scapular kinematics in three planes of shoulder elevation: A comparison between men and women

Nakayama

Onishi

Nojima

et al. 2018

JPFSM

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The aim of this study was to compare scapular kinematics between men and women during shoulder flexion, scapular plane elevation, and shoulder abduction. Eleven healthy men and 11 healthy women participated in this study. As participants performed shoulder flexion, scapular plane elevation, and abduction at a consistent speed, an electromagnetic motion capture system was used to analyze scapular motion. The change in scapular orientation from its resting position was calculated at 30°, 60°, 90° and 120° of humeral elevation. The study found that scapular upward rotation and posterior tilt angles increased significantly with each successive humeral elevation angle, but less so in women than in men. Scapular internal or external rotation differed significantly according to the plane of elevation, that is the scapula was internally rotated during flexion, with no change during scapular plane elevation, and it was externally rotated during abduction. This variation was more marked in women. This study revealed gender differences in scapular kinematics during shoulder motion. During shoulder elevation, the scapulothoracic joint played a greater role in men than in women, whereas the glenohumeral joint played a greater role in women.

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Activation of shoulder muscles in healthy men and women under isometric conditions

Cited by 62 publications

References 24 publications

The Surface EMG Characteristics between Erector Spinae and Vastus Lateralis during Bending Forward and Squatting Down Tasks

The Surface EMG Characteristics between Erector Spinae and Vastus Lateralis during Bending Forward and Squatting Down Tasks

Gender specific activation patterns of trunk muscles during whole body tilt

Analysis of scapular kinematics in three planes of shoulder elevation: A comparison between men and women

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