Sentences with phrase «knee flexion»

Assessing the effect of knee flexion angle, Klein et al. (1996) measured the moment arm as a function of ankle joint range of motion in 10 cadavers.

In the lowering phase, external oblique muscle activity was greatest at knee flexion angles of 60 — 31.

Assessing the effect of foot placement, Escamilla et al. (2001) compared the horizontal leg press performed with a high foot placement (90 — 100 degrees of knee flexion in bottom position) and a low foot placement (20 cm lower).

Comparing differences between legs during the back squat, Flanagan and Salem (2007) found that peak knee flexion angles displayed bilateral differences, with the right side achieving a more acute angle than the left side.

However, when Park and Yoo (2014) investigated these factors, only increasing knee flexion increased gluteus maximus EMG amplitude.

Many studies that have reported muscle moment arms for the various hamstrings muscles for knee flexion with changing knee angle (Spoor et al. 1992; Herzog & Read, 1993; Wretenberg et al. 1996; Lu et al. 1996; Buford et al. 1997; Kellis et al. 1999).

Exploring multiple sets of the Nordic hamstring curl exercise, Marshall et al. (2015) noted that a single set of 5 repetitions led to substantial reductions in peak eccentric knee flexion moments during the exercise, with even further reductions in subsequent sets, implying that performing the Nordic hamstring curl prior to practice or other exercise might not be advisable.

Changing foot orientation changes the percentage of each of the 3 hamstrings during knee flexion.

And although more recent studies do suggest that eccentric knee flexion strength in a Nordic curl exercise might yet be a good predictor of hamstring strain injury (Opar et al. 2015; Timmins et al. 2015a), not all studies have reported exactly the same result (Bourne et al. 2015).

Both groups are activated in most hip extension and knee flexion movements exercises, but the balance between them during each exercise is not the same.

This is the same finding as for resistance training exercises, where isolated knee flexion exercises (such as leg curls) produced the best results with the greatest regularity.

Athletes who have poor eccentric knee flexion strength and / or short biceps femoris (long head) muscle fascicles are more likely to incur a strain, particularly if they have both risk factors.

In practical terms, both upper and middle trapezius display high muscle activity at knee flexion angles of 31 — 60 degrees.

It is noteworthy that in the studies that included exercises involving knee flexion without hip movement (Graham et al. 1993; Orishimo & McHugh, 2015; Tsaklis 2015), these exercises produced the greatest hamstrings EMG amplitude.

This is a very important muscle group for athletes though, because it performs multiple functions crucial for explosive strength, such as knee flexion and hip extension.

You want to achieve a full - range of motion, which puts emphasis on maximum knee flexion.

The biceps femoris (short head) is a single - joint muscle and causes only knee flexion.

It is unclear how the other categories should be viewed, with exercises from the hip extension with partial knee extension, hip extension without knee movement, and hip extension and knee flexion categories all appearing in the best exercises category in some but not all studies.

They found that hip extension performed in knee flexion led to greater gluteus maximus EMG amplitude than hip extension performing in knee extension (23 % vs. 13 % of MVIC).

Think it, the gastrocs pass the genu and play a job in slight knee flexion.

Testing on the 1 R.M. continuum on knee flexion exercises (a.k.a. leg curls) show that to stay within 70 % of the maximum, you can not do more than 8 reps.. So in my opinion, leg curls done above eight reps are a complete waste of time.

These issues set the stage for squatting characterized by quad - dominance, excessive knee flexion, glute inactivity, and spinal flexion.

If you are truly dedicated in solving the problem, I would suggest 10 - 12 sets of low rep knee flexion in the morning, and 8 - 10 sets of high rep hip extensors exercise in the afternoon.

The SQJ test began with the subject in a stance with 90 ° knee flexion, with the feet hip - width apart.

Ideally you should do two types of movement for the hamstrings — a compound hip extension movement (where the hamstrings work in conjunction with the glutes and spinal erectors) and an isolation knee flexion movement.

I am under the impression that the primary function of the quadricep femoris muscles is knee extension, not knee flexion.

And female athletes tend to display less knee flexion than males (Malinzak et al. 2001).

They also have a large knee flexion moment arm, making them a key knee flexor.

Knee flexion force production seems to be greater in prone than in supine (Barr & Duncan, 1988; Worrell et al. 1990), while standing may lead to greater force than prone (Kramer et al. 1996).

They report that with increasing knee flexion angle gastrocnemius muscle activity decreased and soleus muscle activity remained unchanged.

Purpose: Most hamstring - focused exercises typically involve a curling motion, which only involves knee flexion.

In general, there is a trend for hamstrings muscle moment arms to increase with increasing knee flexion angle.

However, increases in muscle fascicle length are also likely dependent on the mechanical load incurred by the prime mover, as knee flexion (hamstring only) exercise seems to lead to greater adaptations in the hamstrings than hip extension (hamstring, gluteus maximus, and adductor magnus) exercise, even when muscle length at peak contraction is shorter (Bourne et al. 2016).

This is an advanced squat where the squatter uses maximum knee flexion.

Similarly, since previous studies have found that knee flexion leads to increased gluteus maximus EMG amplitude through active insufficiency of the hamstrings, placing the knee into flexion during back extensions might also be expected to increase gluteus maximus EMG amplitude during back extensions.

It is thought that lower hip abduction strength leads to a reduced ability to control the hip abduction and internal rotation movements of the thigh during knee flexion.

Catch the bar with a slight knee flexion (do not catch it with straight legs, learn to squat under it) 2.

Rectus abdominis muscle activity was highest at knee flexion angles of 60 — 31 degrees in the lowering phase.

Once you reach 90 - degree knee flexion in both knees, pass the kettlebell through the legs to the other hand and push off the starting position.

Jones et al. (2009) reported that COD ability was more closely associated with eccentric knee flexion (hamstring) strength (r = 0.63), than with other strength measures taken.

Here is an important study, showing that two different exercises (one knee flexion exercise and one hip extension exercise) produced different levels of activation in the upper and lower regions of the hamstrings, even though lateral and medial hamstrings activation appeared much more similar.

Some patients will even feel a tender, thickened band of tissue in this location which is becoming caught under the knee cap between 30 to 70 degrees of knee flexion.