[:en]Video Analytics[:fr]Analyses de vidéos[:]

Analyse Vidéo #1 – Maggie

Dans les vidéos qui me seront transmises via le site, je prends le parti de ne choisir à chaque fois qu’un seul point technique à développer même s’il y a beaucoup de choses à dire sur chaque vidéos. Je réserverai les analyses plus exhaustives à mes étudiants.

La vidéo d’aujourd’hui est une vidéo de Maggie (Taiwan – DYN 151m – NR) où on la voit nager en DYN avec monopalme. Cette technique pourrait être appelée « Deux Temps » et sous-entend : deux cycles de nage alternés avec un temps de glisse. 

On le voit bien dans la vidéo de Maggie : le premier temps de glisse survient au moment du départ après avoir poussé contre le mur puis apparaissent les deux premiers cycles de nage qui vont permettre de créer un nouveau temps de glisse. Durant la phase de glisse Maggie économise son effort et se profile afin de parcourir efficacement la plus grande distance possible.

Pour rentrer un peu dans le détail, un cycle de nage en monopalme est généralement définit par un mouvement descendant (action d’appuyer sur la monopalme) + un mouvement ascendant (action de remonter la palme). En DYN au premier coup d’œil on remarque bien deux cycles de nage entre deux temps de glisse. Mais si la technique DYN « Deux Temps » est bien appliquées, ces deux cycles ne sont pas du tout identiques, leurs amplitudes et leur rythme d’exécution sont vraiment différents. 

Pour amener un peu plus de clarté : 
1 cycle de nage =  un mouvement descendant + un mouvement ascendant .
1 cycle DYN =  2 cycles de nage + un temps de glisse.

Le temps de glisse. 
Dans l’eau à cause des résistances à l’avancement, le corps du nageur durant la phase de glisse perd irrémédiablement de sa vitesse. Vient alors le moment de débuter le premier cycle de nage. Si le nageur a trop attendu, sa vitesse de déplacement sera proche de zéro  ce qui va créer deux problèmes. Le premier c’est la perte d’équilibre, le nageur va devoir monopoliser des resources energétiques importantes afin de le rétablir. Le deuxieme probleme qui survient avec la perte de vitesse c’est que pour recréer du mouvement en partant d’une vitesse zéro il lui faudra dépenser une grande quantité d’énergie pour bouger la masse de son corps. 
Vous l’aurez compris, pour être efficade durant la phase de glisse il faut savoir profiter de son inertie le plus longtemps possible mais sans trop attendre que la vitesse ne se rapproche du 0 absolu en m/s.

Sur la vidéo de Maggie, il n’y a pas d’erreurs majeures à ce niveau là. A l’entraînement dans le cadre d’un exercice spécifique elle peut essayer de déclencher le plus tard possible le premier mouvement après son temps de glisse. En travaillant de cette manière elle trouvera le bon moment pour déclencher  avec un équilibre maitrisé et une vitesse minimale le premier cycle de nage. Elle affinera sur cette phase technique ses sensations proprioceptives (gaînage général pour garder l’équilibre) et ses sensations exteroceptives (sensations de l’eau sur le corps et de sa vitesse d’écoulement ce qui aide à la décision pour déclencher le cycle de nage).

Le premier cycle. 
En DYN l’objectif du premier cycle est de s’appuyer sur une grosse quantité d’eau afin de pouvoir mouvoir la masse du corps du nageur qui est alors presque à l’arrêt.
Pour recréer du mouvement après avoir perdu de la vitesse durant la glisse, la façon la plus efficace pour se relancer est de chercher à s’appuyer sur un gros volume d’eau afin d’avoir un maximum d’appui et de puissance sur un seul cycle. La recherche de l’amplitude implique une vitesse d’execution du cycle de nage plus lente car il faut pouvoir appuyer progressivement sur la monopalme pour profiter pleinement de cette appui.

Le deuxième cycle.
Une fois que la masse du corps a commencé à se déplacer grâce au premier cycle de nage il faut accélérer le deuxième cycle.  Le deuxième cycle est réduit dans son amplitude et  permet une exécution plus rapide ce qui favorise la prise de vitesse pour se lancer dans la phase de glisse.

Sur la vidéo de Maggie, on peut voir que les deux cycles sont identiques en amplitude et en vitesse d’éxecution.  Elle ne prend pas assez de vitesse durant le deuxième cycle ce qui a mon sens est dommage. J’invite Maggie à prendre en considération l’explication technique ci-dessus pour essayer d’appliquer mes recommandations.

La combinaison de cycles la plus efficace serait donc :
1 cycle ample + 1 cycle rapide.
Cette association permet de profiter d’une bonne prise d’appui puis d’une accélération qui va optimiser le lancement de la phase de glisse.

BONUS
« Comme un Dauphin » ou comment optimiser le lancement de la phase de glisse. L’astuce, appelé « Like a Bullet » dont je veux vous parler doit être effectuée lors du mouvement ascendant du deuxieme cycle de nage, quand la palme remonte, juste avant la phase de glisse et la position immobile du nageur.  
Durant ce mouvement ascendant la remontée de palme doit être très active, rapide et surtout s’arrêter net, presque violement lorsque les jambes et la monopalme se retrouvent alors à l’horizontal dans l’alignement du corps. Remontée la monopalme de façon active signifie que c’est vous qui allez remonter volontairement la palme. Cette recherche d’appui vous allez la réussir en maintenant le contact de la palme avec l’eau via les orteils  pour appuyer et repousser la palme vers le haut. Ce mouvement s’effectue avec l’idée d’une accéleration, il doit être réalisé jambe tendue et doit surtout s’arrêter net, sèchement, brutalement quand votre monopalme arrive à l’horizontal. Si ce mouvement est bien effectué et que votre corps est gaîné et profilé alors vous vous propulserez  comme un dauphin dans l’eau… Rien de mieux pour commencer une phase de glisse efficace!

NB: 
Bien sûr je ne parle pas d’avoir une amplitude maximale, extrême et ensuite de fournir un effort ultra violent pour prendre de la vitesse. Remettons tout en perspective… Votre premier cycle doit simplement être plus ample que le second et le deuxieme cycle doit être plus rapide que le premier. « The Bullet» doit-être  exécuté de façon active. A vous d’utiliser la juste énergie afin de vous calibrer durant votre effort à l’entraînement et/ou en compétition.

[:zho]

我希望在各位讀者之中能幫助我找到我更精確的翻譯。歡迎來信於以下電子郵件更正
theo@ylon.com

In the videos that will be sent to me via the site, I take the decision to choose only one technical point to develop even if there is a lot to say about each videos. I will reserve more exhaustive analyses for my students.

Today’s video is a video of Maggie from Taiwan (DYN 151m – NR) where she is seen swimming in DYN with a monofin. This technique could be called « Two Strokes », which means two swimming cycles alternating with a sliding time.


We can see it clearly in Maggie‘s video: the first sliding time occurs at the moment of the start after pushing against the wall. Then the first two swimming cycles appear, which will allow the creation of a new sliding time. During the glide phase Maggie saves her effort and profiles herself in order to cover the greatest possible distance efficiently

To go into a little more detail, a swimming cycle with a monofin is generally defined by a descending movement (pressing down on the monofin) + an ascending movement (raising the monofin). In DYN at first glance you can clearly see two swimming cycles between two glide times. But if the DYN « Two Strokes » technique is well applied, these two cycles are not at all identical, their amplitudes and rhythm of execution are really different. 

To bring a little more clarity : 
1 swimming cycle = one descending movement + one ascending movement.
1 DYN cycle = 2 swimming cycles + one sliding time.

Gliding Time. 
In the water, due to the resistance to forward swimming, the swimmer’s body loses speed during the sliding time. Then comes the moment to start the first swimming cycle. If the swimmer has waited too long, his or her speed will be close to zero, which will create two problems. The first one is the loss of balance, the swimmer will have to monopolize important energy resources in order to restore it. The second problem that arises with loss of speed is that to recreate movement from zero speed, the swimmer will have to expend a large amount of energy to move the mass of his or her body. 

As you will have understood, to be efficient during the gliding phase it is necessary to take advantage of its inertia for as long as possible but without waiting too long for the speed to get close to absolute 0 in m/s.

The first cycle. 
In DYN the objective of the first cycle is to lean on a large quantity of water in order to be able to move the mass of the swimmer’s body which is then almost at a standstill. In order to recreate movement after having lost speed during the glide, the most effective way to re-launch is to try to lean on a large volume of water in order to have maximum support and power in a single swimming cycle. The search for amplitude implies a slower speed of execution of the swimming cycle because it is necessary to be able to progressively press down on the monofin to take full advantage of this grip.

The second cycle.
Once the body mass has started to move thanks to the first swimming cycle, the second cycle must be accelerated.  The second cycle is reduced in its amplitude and allows for a faster execution, which favours the speed to get into the gliding phase.

In Maggie‘s video we can see that the two cycles are identical in amplitude and speed of execution.  She doesn’t gain enough speed during the second cycle which I think is a pity. I invite Maggie to take the above technical explanation into consideration to try to apply my recommendations.

The most effective combination of cycles would therefore be :
1 ample cycle + 1 fast cycle.
This combination allows you to take advantage of a good grip and then an acceleration that will optimise the gliding phase.

BONUS
« Like a dolphin » or how to optimise the launch of the gliding phase. 
The trick, called « like a Bullet », I want to tell you about must be done during the ascending movement of the second swimming cycle, when the monofin goes up, just before the glide phase and the immobile position of the swimmer.  
During this upward movement the monofin lift must be very active, fast and above all stop sharply, almost violently when the legs and the monofin are then horizontal in the alignment of the body. Actively lifting the monofin means that it is you who will voluntarily lift the fin. This search for support is achieved by keeping the fin in contact with the water via the toes to push the fin upwards. This movement is carried out with the idea of acceleration, it must be done with your leg outstretched and must above all stop abruptly when your monofin reaches the horizontal position. If this movement is well done and your body is streamlined then you will propel yourself like a dolphin in the water… Nothing better to start an efficient gliding phase!

NB: 
Of course I’m not talking about having a maximum and  extreme amplitude and then making an ultra violent effort to gain speed. Let’s put everything in perspective… Your first cycle simply has to be larger than the second and the second cycle has to be faster than the first. « The Bullet » must be actively executed. It is up to you to use the right energy to calibrate yourself during your training and/or competition effort.

[:en]

In the videos that will be sent to me via the site, I take the decision to choose only one technical point to develop even if there is a lot to say about each videos. I will reserve more exhaustive analyses for my students.

Today’s video is a video of Maggie from Taiwan ( DYN 151m – NR) where she is seen swimming in DYN with a monofin. This technique could be called « Two Strokes », which means two swimming cycles alternating with a sliding time.


We can see it clearly in Maggie‘s video: the first sliding time occurs at the moment of the start after pushing against the wall. Then the first two swimming cycles appear, which will allow the creation of a new sliding time. During the glide phase Maggie saves her effort and profiles herself in order to cover the greatest possible distance efficiently

To go into a little more detail, a swimming cycle with a monofin is generally defined by a descending movement (pressing down on the monofin) + an ascending movement (raising the monofin). In DYN at first glance you can clearly see two swimming cycles between two glide times. But if the DYN « Two Strokes » technique is well applied, these two cycles are not at all identical, their amplitudes and rhythm of execution are really different. 

To bring a little more clarity : 
1 swimming cycle = one descending movement + one ascending movement.
1 DYN cycle = 2 swimming cycles + one sliding time.

Gliding Time. 
In the water, due to the resistance to forward swimming, the swimmer’s body loses speed during the sliding phase. Then comes the moment to start the first swimming cycle. If the swimmer has waited too long, his or her speed will be close to zero, which will create two problems. The first one is the loss of balance, the swimmer will have to monopolize important energy resources in order to restore it. The second problem that arises with loss of speed is that to recreate movement from zero speed, the swimmer will have to expend a large amount of energy to move the mass of his or her body. As you will have understood, to be efficient during the gliding phase it is necessary to take advantage of its inertia for as long as possible but without waiting too long for the speed to get close to absolute 0 in m/s.

On Maggie‘s video, there are no major errors in this area. When training for a specific exercise she can try to trigger the first movement as late as possible after her sliding time. By working in this way she will find the right moment to start the first swimming cycle with controlled balance and minimum speed. During this technical phase she will refine her proprioceptive sensations (general gaiting to keep her balance) and exteroceptive sensations (sensations of the water on the body and of its flow speed which helps in the decision to start the swimming cycle).

The first cycle. 
In DYN the objective of the first cycle is to lean on a large quantity of water in order to be able to move the mass of the swimmer’s body which is then almost at a standstill. In order to recreate movement after having lost speed during the glide, the most effective way to re-launch is to try to lean on a large volume of water in order to have maximum support and power in a single swimming cycle. The search for amplitude implies a slower speed of execution of the swimming cycle because it is necessary to be able to progressively press down on the monofin to take full advantage of this grip.

The second cycle.
Once the body mass has started to move thanks to the first swimming cycle, the second cycle must be accelerated.  The second cycle is reduced in its amplitude and allows for a faster execution, which favours the speed to get into the gliding phase.

In Maggie‘s video we can see that the two cycles are identical in amplitude and speed of execution.  She doesn’t gain enough speed during the second cycle which I think is a pity. I invite Maggie to take the above technical explanation into consideration to try to apply my recommendations.

The most effective combination of cycles would therefore be :
1 ample cycle + 1 fast cycle.
This combination allows you to take advantage of a good grip and then an acceleration that will optimise the gliding phase.

BONUS
« Like a dolphin » or how to optimise the launch of the gliding phase. 
The trick (called « like a Bullet ») I want to tell you about must be done during the ascending movement of the second swimming cycle, when the monofin goes up, just before the glide phase and the immobile position of the swimmer.  
During this upward movement the monofin lift must be very active, fast and above all stop sharply, almost violently when the legs and the monofin are then horizontal in the alignment of the body. Actively lifting the monofin means that it is you who will voluntarily lift the fin. This search for support is achieved by keeping the fin in contact with the water via the toes to push the fin upwards. This movement is carried out with the idea of acceleration, it must be done with your leg outstretched and must above all stop abruptly when your monofin reaches the horizontal position. If this movement is well done and your body is streamlined then you will propel yourself like a dolphin in the water… Nothing better to start an efficient gliding phase!

NB: 
Of course I’m not talking about having a maximum and  extreme amplitude and then making an ultra violent effort to gain speed. Let’s put everything in perspective… Your first cycle simply has to be larger than the second and the second cycle has to be faster than the first. « The Bullet » must be actively executed. It is up to you to use the right energy to calibrate yourself during your training and/or competition effort.

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