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Thread: smash factor
06-16-2009, 12:41 PM #18
06-16-2009, 01:05 PM #19
nope not a coach but ive been taught by some very good people
06-16-2009, 02:08 PM #20
06-16-2009, 02:23 PM #21
BUT, what i've learned through my studies is that things are not always as they seem....and just because something is the common perception, doesn't mean that is what is happening physiologically.
Do you understand WHY the legs are important physically in a jump smash? I'm not questioning your statement that strong legs are essential to a smash. But, they are important because they act as an important stability factor/along with the core, so that your upper body can be harnessed to its full power. Obviously, if your legs/core is weak, then once your are in the air, this instability will not allow your upper body to be harnessed to its full potential.
You have been taught by some great ppl...but what makes you think I haven't...and yes...all of them will teach you that the power of a smash comes from the legs...and many of them use the word "transfer" power. BUT....how many of them can explain the physiological reasons behind HOW this "transfer" occurs? So, I think a more proper way to say it is that stronger legs "allow" for a strong smash because the added stability lets your upper body harness more power. More Strength = more stability = more power. Although I agree that the word "transfer" is a good way to teach players and to allow them to understand, because it does "feel" that way. And it feels that way because when you jump..you're focusing on your legs...to recruit muscle fibres for the jump..then..after you are in the air....you change your mental focus to recruiting muscle fibres in your upper body. Without doubt, this creates a SENSATION that power is being "transferred" through your body. But is this actually what is happening physiologically?..I don't think so.
another example: stand stationary and try to smash as hard as you can without turning your lower body. you'll find that this is quite difficult since you can only use your wrist and chest.
now try turning your lower body as well as your upper body. as soon as you do this, you are utlizing your whole body (IN PARTICULAR YOUR LEGS) your smash will be significantly harder
Last edited by William86_98; 06-16-2009 at 02:25 PM.
06-16-2009, 02:45 PM #22
When smashing, the legs (particularly the hips) initiate body rotation. This does two things:
1. gives your body momentum which can be transferred through the arm and into the racquet
2. puts the appropriate shoulder muscles into a pre-stretch which increases the potential for power from the shoulder
However, for a jump smash, body rotation is quite slow, so in my opinion #1 isn't the key factor here. #2 on the other hand is quite important. There is also a third factor at work: if the body is moving away or not moving forwards into the shot, you're less efficient at transferring energy outwards from the body. For example, if you were to extend your elbow with your shoulder relaxed, your hand will move one way while your shoulder goes the other way to conserve momentum. Now lets say you swing your arm gently just before you extend the elbow. Going one way, the two movements interfere and cancel each other out. The other way, they sum up so all the energy gets transferred to the hand. The idea is that having the right body movement will minimize energy loss like this and help ensure that it all gets transferred to the end - the racquet.
In practice, what this means to me is to emphasize correct body position and initiate the shot with the legs to get the correct movement and stretch reflex. However, I wouldn't really emphasize turning the hips faster for "more power". As for the kick, like william86-98 says, it's more for stabilizing the body than for creating movement.
06-16-2009, 03:04 PM #23
maybe i missed it, but i have yet to read where you think the power is generated from. wrist, arms, chest?
06-16-2009, 03:17 PM #24
http://www.youtube.com/watch?v=cIYbsGYT4m4&feature=fvsr I would think the power exerted on the bird is a summation of the trunk turn, arms, and wrist, and other upper body forces. Forces that are "above" the "pivot" (centre of gravity) of the body. These forces are what are pushing downwards. Power is only exerted when there is movement, and these are the parts that move once he is in the air.
06-17-2009, 02:05 PM #25
I don't see the point of arguing this. Let's just list out the SMASH FACTOR and JUMP SMASH FACTOR. And when i said list mean just LIST THEM ALL out.
ON ground smash
3. wrist (i would think it's tricep muscle power?)
4. flat face contact with the bird
5. speed of the swing (fast then good with tight tension)
3. Shoulder (obviously I'll list everything else from the first one)
06-18-2009, 10:29 AM #26
Here's what I look for:
- side on correct body alignment (side on position)
- correct sequence of movements (proximal -> distal)
- correct grip (forehand vs panhandle)
- overhead contact (many beginners contact out to the side)
- gross vs fine motor control (many people are too fine motor control dominant)
More Advanced Stuff
- core strength (look for the lumbar spine to rotate as one unit, rather than twist)
- hand/wrist stiffness at contact (dependant on isometric/eccentric strength + RFD)
- subtle grip adjustments to account for misalignments in body position
- ability to stabilize the body before as part of stroke preparation, in a variety of situations
- ability to see the court and opponents, and recognize openings
- recovery after smashing, particularly moving in to the net quickly
- upper body strength
06-19-2009, 06:15 PM #27
But of course If i ever misunderstood what u said then yea sry.
06-19-2009, 10:35 PM #28
06-29-2009, 10:43 PM #29
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