Sentences with phrase «shoulder flexion moment»

Between 100 — 60 degrees of shoulder flexion the moment arm length increases linearly approximately -5.0 mm to -10.0 mm.

As is clear from the chart below, the anterior deltoid has a large shoulder flexion moment arm length, which makes it a prime mover in this movement.

Although overall the pectoralis major may have a small shoulder flexion moment arm, this obscures the fact that the different heads have very different moment arm lengths.

Therefore, the superior performance of the flat bench press over the incline bench press for the sternocostal head is probably because there is a greater horizontal shoulder adduction moment in the flat and decline variations, but a larger shoulder flexion moment in the incline variations.

In contrast, the close grip bench press benefits the clavicular head, probably because there is a larger shoulder flexion moment.

Not exact matches

Keuchle et al. (1997) showed that the pectoralis major moment arm peaked at 45 degrees of shoulder horizontal flexion while the smallest moment arm was found at 140 degrees (reaching across the body).

As the shoulder moves in horizontal flexion from 0 degrees (with the arms reaching out sideways from the body), the moment arm length increases from approximately 32 mm to 46 mm at 45 degrees.

Indeed, the pectoralis major has longer moment arm lengths for shoulder horizontal adduction (also called shoulder horizontal flexion) than any of the other chest muscles, indicating it is the prime mover for this action (Keuchle et al. 1997).

Landin & Thompson (2010) investigated the effect of elbow flexion and shoulder extension joint angle on the peak moment of the long head of the triceps.

Ackland et al. (2008) showed that the inferior sternocostal fibers produce large moment arms throughout full shoulder flexion range of motion that is highest around the mid-range but remains high at 120 degrees (arms above head).

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).

Ackland et al. (2008) showed that the pectoralis major (clavicular head) displayed a peak moment arm length of 30.2 mm at 120 degrees of shoulder flexion (arms above head) and a minimum moment arm length at 2.5 degrees (length = +3.1 mm) of shoulder scapular plane flexion.

The moment arm length displays a plateau between 120 — 100 degrees of shoulder flexion.

In contrast, Ackland et al. (2008) reported the middle deltoid also displayed a peak moment arm length of only 12.2 mm at 120 degrees of shoulder flexion.

As explained above, the inferior fibers of the latissimus dorsi muscle display a peak moment arm length of -10.8 mm at 53 degrees of shoulder flexion and a minimum moment arm length of -2.9 mm at 120 degrees.

In contrast, Ackland et al. (2008) showed that the posterior deltoid displayed a peak shoulder extension moment arm length of -33.0 mm at 30 degrees of flexion (arm pointing down), indicating that it likely acts as a primary shoulder extensor, second to the teres major while the arm is close to the body.

While the anterior deltoid has only the fourth largest peak moment arm length during shoulder flexion, the clavicular pectoralis major and posterior and anterior subscapularis have maximum moment arms lengths at moderate (71 degrees) and small (2.5 degrees) shoulder positions respectively.

The inferior fibers displayed a peak moment arm length of 38.1 mm at a shoulder flexion angle of 71 degrees, while the minimum moment arm length was -3.3 mm at 10 degrees.

Ackland et al. (2008) reported that the middle deltoid displayed a similarly large shoulder flexion muscle moment arm of 33.1 mm at 120 degrees, indicating that both the anterior and middle deltoids are capable of producing large forces during shoulder flexion in the scapular plane.

However, it does seem likely that the anterior deltoid moment arm length increases with shoulder flexion and peaks as the arm approaches or passes parallel.

Keuchle et al. (1997) reports the change in moment arm length with the change in shoulder flexion range of motion.

The superior fibers of the latissimus dorsi displayed a peak moment arm length of 22.1 mm at 45 degrees of shoulder flexion (midway below horizontal) and a minimum moment arm length of -0.1 mm at 120 degrees (arms above the head).

The moment arm length increases between 120 degrees and 60 degrees of shoulder flexion.

Ackland et al. (2008) reported that the peak moment arm length of the latissimus dorsi was displayed in a wide range between 10 — 71 degrees of shoulder flexion depending on the muscle region measured.