Activity of Different Shoulder Muscles during Dynamic Bear Crawl Exercise (original) (raw)
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Comparison of electromyographic activity during the bench press and barbell pullover exercises
The aim of the study was to compare the electromyographic (EMG) activity of the following muscles: clavicular portion of pectoralis major, sternal portion of pectoralis major, long portion of triceps brachii, anterior deltoid, posterior deltoid and latissimus dorsi during dynamic contractions between flat horizontal bench press and barbell pullover exercises. The sample comprised 12 males individuals experienced in resistance training. The volunteers made three visits to the laboratory. The first one consisted of 12 repetitions of the exercises for the electromyographic data collection. The results showed a higher EMG activation of the pectoralis major and anterior deltoid muscles in the flat horizontal bench press in comparison with the barbell pullover. The triceps brachii and latissimus dorsi muscles were more activated in the barbell pullover.
Electromyographic analysis of shoulder muscles during press-up variations and progressions
2014
Due to the versatility of the press-up it is a popular upper extremity strengthening and rehabilitation exercise. Press-up programmes are often progressed by increasing weightbearing load and using unstable bases of support. Despite the popularity of the press-up research examining press-up variations is limited. The aim of the study was to examine the influence of common press-up exercises on serratus anterior, infraspinatus, anterior deltoid, pectoralis major and latissimus dorsi muscles overall EMG activity. Twenty one healthy individuals participated in this study. Surface electrodes were placed on pectoralis major, anterior deltoid, infraspinatus, serratus anterior and latissimus dorsi muscles. Participants were tested under 7 static press-up conditions that theoretically progressively increase weight-bearing load and proprioceptive challenge while surface electromyographic activity was recorded. There was a high correlation between increased weight-bearing load and increased EMG activity for all muscles in stable base conditions. The introduction of the unstable base conditions resulted in an activation decline in all muscles. Within the twoarmed press-up the Swiss ball resulted in decreased activation in all muscles except pectoralis major. Serratus anterior demonstrated the greatest activation as a percentage of maximum isometric contraction across all exercises. The findings of this study indicate that by varying the weight-bearing load and base of support whilst in the press-up position results in significantly different demands on shoulder and scapula muscles.
Journal of Strength and Conditioning Research, 2013
Schoenfeld, B, Sonmez, RGT, Kolber, MJ, Contreras, B, Harris, R, and Ozen, S. Effect of hand position on EMG activity of the posterior shoulder musculature during a horizontal abduction exercise. J Strength Cond Res 27(10): 2644-2649, 2013-The reverse fly machine is a popular exercise for strengthening the horizontal shoulder abductors including the posterior deltoid.
Electromyographic Activity of the Upper Limb Muscleduring Specific Salat’s Position and Exercise
International Journal of Applied Physics and Mathematics, 2013
This study investigated the muscle activity of the neck extensors (NE), sternocleidomastoideus (SCM) and biceps brachii (BB) muscles in healthy subjects during salat and specified exercises using surface electromyography (EMG). A group of undergraduates aged between 19 to 25 years voluntarily participated in this study. For the assessment of the NE and SCM, the subjects were asked to perform salat (salam's position) and exercise [neck rotation exercise (NRE)]. Subjects were asked to perform takbir's position and biceps dumbbell curl (BDC) to access BB. The EMG and the motion signals of the muscles were recorded. The findings indicate that there were contractions of the muscles during the salat and exercise with difference EMG level. For NE and SCM, Wilcoxon's Rank Sum Test showed a statistically no significant difference between salat and exercise for NE (p = 0.482) and SCM (p=0.161). For the BB, Wilcoxon's Rank Sum Test showed a statistically significant difference between salat and exercise (p<0.05) with differences 18.48% MVC. However, BB showed the EMG level with mild contraction. Therefore, salat may be useful in warm up exercise or in rehabilitation programs. This pilot study can be as initial research about other biomechanical response of human muscle with other position in salat.
Journal of Strength and Conditioning Research, 2008
Imbalance and weakness of the serratus anterior and upper trapezius force couple have been described in patients with shoulder dysfunction. There is interest in identifying exercises that selectively activate these muscles and including it in rehabilitation protocols. This study aims to verify the UT/SA electromyographic (EMG) amplitude ratio, performed in different upper limb exercises and on two bases of support. Twelve healthy men were tested (average age = 22.8 6 3.1 years), and surface EMG was recorded from the upper trapezius and serratus anterior using single differential surface electrodes. Volunteers performed isometric contractions over a stable base of support and on a Swiss ball during the wall push-up (WP), bench press (BP), and push-up (PU) exercises. All SEMG data are reported as a percentage of root mean square or integral of linear envelope from the maximal value obtained in one of three maximal voluntary contractions for each muscle studied. A linear mixed-effect model was performed to compare UT/SA ratio values. The WP, BP, and PU exercises showed UT/SA ratio mean 6 SD values of 0.69 6 0.72, 0.14 6 0.12, and 0.39 6 0.37 for stable surfaces, respectively, whereas for unstable surfaces, the values were 0.73 6 0.67, 0.43 6 0.39, and 0.32 6 0.30. The results demonstrate that UT/SA ratio was influenced by the exercises and by the upper limb base of support. The practical application is to show that BP on a stable surface is the exercise preferred over WP and PU on either surfaces for serratus anterior muscle training in patients with imbalance between the UT/SA force couple or serratus anterior weakness.
Journal of athletic training, 2015
The push-up is a widely used exercise for upper limb strengthening that can be performed with many variants. A comprehensive analysis of muscle activation during the ascendant phase (AP) and descendant phase (DP) in different variants could be useful for trainers and rehabilitators. To obtain information on the effect of different push-up variants on the electromyography (EMG) of a large sample of upper limb muscles and to investigate the role of the trunk and abdomen muscles during the AP and DP. Cross-sectional study. University laboratory. Eight healthy, young volunteers without a history of upper extremity or spine injury. Participants performed a set of 10 repetitions for each push-up variant: standard, wide, narrow, forward (FP), and backward (BP). Surface EMG of 12 selected muscles and kinematics data were synchronously recorded to describe the AP and DP. Mean EMG activity of the following muscles was analyzed: serratus anterior, deltoideus anterior, erector spi...
EFFECTS OF BODY POSITION AND LOADING MODALITY ON MUSCLE ACTIVITY AND STRENGTH IN SHOULDER PRESSES
Saeterbakken, AH and Fimland, MS. Effects of body position and loading modality on muscle activity and strength in shoulder presses. J Strength Cond Res 27(7): 1824–1831, 2013—Little is known about the effect of performing upper-body resistance exercises with dumbbells versus barbells and standing versus seated. Therefore, this study sought to compare electromyogram activity (EMG) and one-repetition maximum (1-RM) in barbell and dumbbell shoulder presses performed seated and standing. Fifteen healthy men volunteered for 1-RM and EMG testing with a load corresponding to 80% of the 1-RM. Electromyogram activity was measured in the anterior, medial, and posterior deltoids and biceps and tri-ceps brachii. The following EMG differences or trends were observed: For deltoid anterior: ;11% lower for seated barbell versus dumbbell (p = 0.038), ;15% lower in standing barbell versus dumbbell (p , 0.001), ;8% lower for seated versus standing dumbbells (p = 0.070); For medial deltoid, ;7% lower for standing barbell versus dumbbells (p = 0.050), ;7% lower for seated versus standing barbell (p = 0.062), 15% lower for seated versus standing dumbbell (p = 0.008); For posterior deltoid: ;25% lower for seated versus standing barbell (p , 0.001), ;24% lower for seated versus standing dumbbells (p = 0.002); For biceps, ;33% greater for seated barbell versus dumbbells (p = 0.002), 16% greater for standing barbell versus dumbbell (p = 0.074), ;23% lower for seated versus standing dumbbells (p , 0.001); For triceps, ;39% greater for standing barbell versus dumbbells (p , 0.001), ;20% lower for seated versus standing barbell (p = 0.094). 1-RM strength for standing dumbbells was ;7% lower than standing barbell (p = 0.002) and ;10% lower than seated dumbbells (p , 0.001). In conclusion, the exercise with the greatest stability requirement (standing and dumbbells) demonstrated the highest neuromuscular activity of the deltoid muscles, although this was the exercise with the lowest 1-RM strength.
EMG Analysis of Dynamic Warm-up Exercises for Overhead Sports
Physical Medicine and Rehabilitation Research, 2018
Objectives: In overhead throwing sports, traditional pre-throwing programs have focused primarily on the upper extremity. However, training the total body and utilizing both the lower and upper extremity in dynamic overhead movements is becoming more popular and advised. Thus, it was the purpose of this study to examine muscles about the lumbopelvic-hip complex (LPHC) and scapula during selected exercises that could possibly be utilized in a pre-throwing conditioning program. Design: A controlled laboratory study. Methods: Twenty-one healthy, active individuals (171.1 ± 13.0 cm; 75.5 ± 14.8 kg; 25.3 ± 5.5 years), regardless of sex, volunteered. Surface EMG was utilized to measure muscle activation of the biceps femoris, semitendinosus, bilateral gluteus medius, gluteus maximus, erector spinae, latissimus dorsi and lower trapezius while performing four total body exercises (lungeW, kettlebell swing, kettlebell deadlift, gluteal/hamstring raise). Results: A nonparametric Friedman Test revealed significantly different muscle activations as a factor of exercise for the biceps femoris (χ 2 (3) = 21.18, p < .001), gluteus maximus (χ 2 (3) = 39.17, p < .001), right gluteus medius (χ 2 (3) = 21.21, p < .001), left gluteus medius (χ 2 (3) = 11.02, p = .012), erector spinae (χ 2 (3) = 28.47, p < .001), and lower trapezius (χ 2 (3) = 29.84, p < .001). Conclusion: The four exercises successfully elicited moderate to high muscle activation in all musculature, except the lower trapezius. These results imply that these four exercises could be utilized as a warm-up/pre-throwing protocol to achieve LPHC as proximal scapula muscle activation.