Sentences with phrase «of pectoralis»

As you can see from the chart below, the clavicular head of the pectoralis major displays the largest shoulder flexion muscle moment arm out of all parts of the pectoralis major, with a peak moment arm length of 53.7 mm at 71 degrees of shoulder flexion (arms just below parallel with the ground).

In contrast, the inferior part of the sternocostal head of the pectoralis major provides a large shoulder scapular plane extensor muscle moment arm length.

Using a reverse (supinated) grip could increase the involvement of the clavicular part of the pectoralis major.

The purpose of this section is to describe the muscle architecture of the pectoralis major muscle.

There is limited data regarding the physiological cross section of the pectoralis major.

So the clavicular head of the pectoralis major seems only to assist in shoulder abduction and then mainly only above 40 degrees, peaking at 120 degrees (arms above the head), as is shown in the following chart below.

Using a wide or narrow grip width causes differences in the shoulder abduction angle, which are probably what leads to the stress being placed on different parts of the pectoralis major muscle.

The flat and decline variations of the bench press appear best for developing the sternocostal head of the pectoralis major.

Several studies have directly compared the EMG activity of the pectoralis major across a range of resistance exercises.

Yasuda et al. (2011) recorded cross-sections of the pectoralis major using magnetic resonance imaging (MRI) scans from three groups of 10 healthy recreationally active male subjects prior to a resistance training program.

Since the other prime movers (including the triceps brachii) did not display such close relationships with increasing bench press strength, these findings demonstrate that the bench press is an ideal exercise for increasing the size of the pectoralis major muscles, particularly when a wide grip variation is used.

Strangely, even though larger muscles tend to be more pennate than smaller ones, the smaller clavicular head of the pectoralis major appears to be more highly pennated than the much larger sternocostal head.

In practice, large levels of pectoralis major EMG amplitude can be achieved by a number of traditional multi-joint shoulder horizontal adduction and elbow extension exercises.

Indeed, in many cases it is likely that performing the push up without additional external load (such as elastic resistance) is unlikely to produce sufficient levels of pectoralis major EMG amplitude such that the exercise will help develop muscular strength and size.

Single - joint exercises involving shoulder horizontal adduction also produce high levels of pectoralis major activation.

Overall, research indicates that the free - weight and machine bench press produce very similar levels of pectoralis major EMG amplitude and therefore either will train the muscle effectively.

Targeting each of the two parts of the pectoralis major can be done by altering grip width and pressing angle during the bench press.

Studies investigating multi joint exercises (such as the bench press) and single joint exercises (such as the dumbbell fly, pec deck machine, and bent - forward cable cross-over) have generally found similar levels of pectoralis major EMG amplitude across all exercises, which suggests that either type of exercise can be used to good effect (Welsch et al. 2005; Rocha - Junior 2007; Shanke 2012).

In contrast, the sternocostal head of the pectoralis major provides one of the largest shoulder adduction moment arms of the upper body musculature.

Intervention — any acute study assessing the muscle activity of the pectoralis major during the bench press exercise

Even so, most push ups probably do not provide sufficient levels of pectoralis major activation to be that effective.

There seem to be significant differences between the two heads of the pectoralis major insofar as they perform shoulder adduction or abduction.

In contrast, the chart shows that the lower sternocostal head of the pectoralis major actually displays a shoulder extension peak moment arm of -9.3 mm at 98 degrees (arms just above parallel with the ground).

In contrast, with a wide grip, they found greater levels of pectoralis major sternocostal muscle activity with an incline of 0 degrees (flat) compared with the other inclines.

In addition, the sternocostal head of the pectoralis major can be further partitioned into up to 7 individual segments in a fan - like arrangement, where each segment lies partially over the segment below it (Fung et al. 2009).

The moment arm lengths of the pectoralis major change considerably depending on (1) where in the overall joint range of motion they are measured, and (2) which part of the muscle is measured (upper, middle, or lower).

The purpose of this section is to detail the muscle moment arms of the pectoralis major muscle in each of the sagittal, frontal, and transverse planes, and to explain how they change with changing joint angles.

Such a training program produces consistently greater hypertrophy of the pectoralis major than the other prime movers, such as the triceps brachii or the anterior deltoids.

Dumbbell pullover develops the bulk of the pectoralis major, long heat of triceps brachii, teres major, latissimus dorsi, serratus anterior, rhomboids, and pectoralis minor.

This puts your humerii (plural of humerus) in external rotation, thus preventing the full activation of the pectoralis major, which is an internal rotator of the humerus.

An upper body workout is not complete without some exercises that focus on the antagonists of the pectoralis major and deltoids, namely the rhomboids, trapezius, and latismuss dorsi.

More precisely, it is situated medial to the lateral deltoid and lateral to the clavicular head of the pectoralis major.

Decline bench cable fly targets the fibres of the sternal head of the pectoralis major (lower chest).

The other two - thirds of the collarbone serves as the launching point for the uppermost fibers of the pectoralis major.

All chest exercises work both heads of the pectoralis major, so you can't «isolate» either one of them.

Both parts of the pectoralis major will move the arm back towards the side (adduction), pull the arm across the chest (horizontal adduction) and turn the shoulder inwards (internal rotation).

Both portions of the pectoralis major insert on the lateral lip of the bicipital groove of the humerus

Sticking with the bench press as an example, it may only consist of the pectoralis muscles, the deltoids and the triceps but the pectoralis is a massive muscle (comparatively for the upper body) but this explains why it is one of the best measures of upper body strength there is available.

EMG studies have shown that it stimulates more of the pectoralis major muscle than any other bench press variation.

With the neck press, your arms are positioned in a way that minimizes the use of the front deltoids and maximizes the use of the pectoralis major of the chest.

In a recent EMG experiment whose results were published over at T-Nation.com, strength coach Bret Contreras compared 20 different chest exercises to see which ones best stimulated the lower, middle and upper portions of the pectoralis major muscle of the chest.

These regions of the pectoralis major have to be targeted specifically for optimal growth.

It's a super effective move that targets the sternal head, the lower part of your pectoralis major.

In UCS, tightness of the upper trapezius and levator scapula on the dorsal side crosses with tightness of the pectoralis major and minor.

It consists of the pectoralis major and minor.

As the incline goes from -45 degrees (a decline flye), to 0 degrees (the flat bench flye), to 45 degrees (an incline flye), to 90 degrees (the military, or shoulder press), the primary muscles being worked progresses from the sternal region of the pectoralis major, to the clavicular region of the pectoralis major, to the deltoids (shoulders).

However, EMG studies have shown that, surprisingly enough, the decline bench press stimulates the upper portion of the pectoralis major muscle, better than it does the lower.

The sternal (lower) region of the pectoralis major does most of the work for your chest with some help from the clavicular region.

The pectorals are predominantly used to control the movement of the arm, with the contractions of the pectoralis major pulling on the humerus to create lateral, vertical, or rotational motion.

Incline bench tears up the upper pecs and provides great definition along the collarbone.Decline bench rounds out the lower areas of the pecs, tightening up the lower curve of the pectoralis muscle.