i*********5
发帖数: 19210 | 1 【 以下文字转载自 Swimming 讨论区 】
发信人: ironman2015 (1/2 ironman x3), 信区: Swimming
标 题: high elbow catch / early vertical forearm (EVF)
发信站: BBS 未名空间站 (Fri Dec 28 09:51:33 2012, 美东)
http://www.osbmultisport.com/articles/strokeanalysis2.html
One of the main points we make in our Powerstroke® clinics is the
emphasis we place on high elbow catch / early vertical forearm (EVF) during
the catch and pull phase of the stroke. Note that you can have a high elbow
catch that does not start particularly early in the stroke – hence the
additional name of early vertical forearm.
“Early” means that the elbow begins to rotate upward / hand and forearm
downward or perpendicular relative to the bottom of the pool just after the
extension phase of the stroke.
Some swimmers start to pull down in what we call a straight arm pull, and
then begin the high elbow catch. This is good but not as technically
proficient a move or ultimately as powerful a swim stroke as an EVF will be
(used in conjunction with high force output).
Regardless, below are a few underwater shots and accompanying explanations.
Figure I. Initial extension
In this shot you can see the extent to which the swimmer has extended his
lat and ‘reached’ forward. The hand is just beginning to initiate a catch
position (the forearm will follow momentarily). The swimmer’s body has
rotated quite a bit so that he is almost directly on his right side with the
right shoulder extended forward.
Figure II. high elbow catch phase begins
At this point in the stroke, the swimmer’s right shoulder remains extended
forward, and has rotated internally while the right hand and forearm are
moving into the ‘early vertical forearm’ position. The left arm has just
entered the water to begin extending forward.
Figure III. Vertical forearm 1
Now the swimmer’s body has rotated so that his chest is facing the bottom
of the pool, while the right hand and arm are nearly entirely vertical.
Note that the right shoulder remains extended forward and the right lat
muscle is fully flexed, beginning a powerful contraction (the pull). This
contraction will move the body forward through the water; the hand and
forearm act as an anchor point. The swimmer is literally pulling himself
forward through the water by anchoring his hand in front of him and then ‘
levering’ himself forward stroke by stroke. That is what swimming is all
about.
Figure IV. Vertical forearm 2
Now the shoulder has moved back towards the torso (or the torso has moved
forward through the water) and the hand and forearm are entirely vertical.
There may be some internal rotation of the arm (towards the torso) as the
body rotates forward to allow the left arm to extend fully. The lat remains
the primary mover through this point in the stroke.
Figure V. The push phase
Once the arm has moved under the shoulder, the pulling motion becomes a
pushing motion. At this point the triceps, biceps, and pectorals take over
some of the work of the lat. (The lat has now contracted quite a bit and is
no longer in a position to be used optimally).
Figure VI. Final push and left arm extension
The right arm has now moved back towards the hip. At this point the triceps
have taken over more work from the lats and can be used to get a bit more
forward propulsion out of the entire stroke. Meanwhile the left arm is
extending forward and slightly up in order to make the most out of the next
catch and pull.
Most of the power in the swim stroke takes place in Figures II through IV.
In Powerstroke®, we concentrate on a high force contraction through
these motions. It is crucial to note that without proper form, the power
will not be not applied effectively. That is why the full name of the DVD
is Powerstroke®: Speed through force and form. | C******u
发帖数: 900 | | p********r
发帖数: 3799 | 3 应该看看这个,这个是我见过的最好的示范了。 也有人把这个叫 Front Quadrant High
Elbow Catch，前叉高肘。 | i*********5
发帖数: 19210 | 4 嗯，这个特好，前两天我在泳版也贴了。
High
【在 p********r 的大作中提到】
: 应该看看这个,这个是我见过的最好的示范了。 也有人把这个叫 Front Quadrant High
: Elbow Catch，前叉高肘。
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