Yamashita (1988) compared hamstrings EMG amplitude during isolated hip extension and isolated
knee extension movements performed with 20 % of the MVIC moment to hamstrings EMG amplitude with a combined hip and knee extension movement using the same hip and knee extension moments.
Moreover, Lloyd and Buchanan (2001) noted that the gracilis does possess a muscle moment arm that is supportive of knee valgus moments during
knee extension movements.
The majority of these comparisons demonstrate that exercises with minimal
knee extension movement and with the peak muscle force exerted with a fully - extended hip are superior (quadruped hip extension, prone hip extension with flexed knee, and front plank with hip extension).
Not exact matches
The leg
extension is a simple, limited
movement which occurs only at the
knee joint and can be used to strengthen the quads.
The Lying
Knee Extension is the first of three ground - based resistance band
movements in this series.
Lift the bar up by extending the hips and
knees and keeping the bar close to the body until you reach full
extension before lowering it to the bottom of the
movement again.
It trains a lot of muscle groups at the same time, trains
movement patterns that are heavily relied upon in rugby (hip and
knee extension + a ton torso stability), and it can be heavily loaded, which lends itself to strength development.
But here's the problem - leg
extensions can be trouble for your
knees, especially if you already have bad
knees or if you use a ballistic
movement on the exercise (or too much range of motion!).
Training the jerk may require improving
knee extension strength, and the jerk may transfer best to
movements requiring substantial net
knee joint moments.
When an agonist muscle contracts (for example the quads, causing
knee extension), the antagonist muscle is inhibited, causing it to relax (in this example the hamstrings), allowing the full
movement of the antagonist muscle (
knee extension).
As you begin to reach the end of the
movement stop just before full
extension and do not lock out
knees!
I am seeing a complete lack of glute firing when trying to teach any triple
extension movement,
knees buckling in when squatting, and the inability to straighten their legs and touch the floor without pain and discomfort.
The hamstrings have two major functions...
knee flexion (which is the better known «leg curl» type of
movement) and hip
extension (which is bringing the thigh backwards).
Olympic lifts are triple
extension movements, targeting the hips,
knees and ankles.
Looking at the
movement of the squat, it trains the flexion and
extension of the hip and
knees.
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.
It may be the case that the
movement pattern can be performed in either a hip - dominant or a
knee - dominant way and that greater inclination of the trunk leads to greater hip
extension moments (Yoshioka et al. 2007).
However, noting the significant gain in hip
extension in the intervention group from prelunge to postlunge in the second session and comparing them to the results reported by Macdonald et al. (6) of immediate gains in
knee flexion angle post foam rolling, it is reasonable to conclude that the effects of foam rolling are immediate, even in a dynamic
movement, but do not remain for longer bouts of time.
From a review of the literature, it is immediately apparent that very few studies have included any rehabilitation exercises in the hip
extension and
knee flexion, and hip
extension without
knee movement categories.
Warm - Up Group Dynamic Skill Tactics and pacing Room set up Workout of the Day «Filthy Fifty» For Time: 50 Box Jumps50 Jumping Pull - ups50 Kettlebell Swings, 1 pood50 Lunges 50
Knees to Elbows50 Push Presses, 45 pounds 50 Hip
Extensions 50 Wallball Shots, 20 pounds50 Burpees50 Double - UndersLEVELS L1: 25 of every
movement (scaled if needed) L2: 35 of -LSB-...]
Training to increase the strength and size of the gluteus maximus may be better performed with
movements that limit
knee extension (e.g. hip thrusts and back
extensions) compared to with
movements that involve substantial
knee extension (squats and step ups).