Post by dubiousgolfer on Oct 29, 2021 12:20:41 GMT -5
Dr Mann
I am getting some very confused definitions of lead forearm rotation for those TPI graphs :
Jeff Martin said the following in an old Golfwrx thread dated 2014:
""The TPI AMM system does not measure shoulder IR/ER. The TPI forearm supination data actually reflects the combined rotation of the humerus and forearm. So two players can have identical lead forearm supination numbers in a TPI report, but do it completely differently. "
I emailed Dr Greg Rose to confirm:
My 1st email:
Dear Dr Rose
With regards the Lead Wrist blue graph (Sup-Pro) , does that relate to just independent forearm rotation or is it a sum of 'upper arm & forearm rotation'?
Dr Rose 1st reply:
it is for forearm independent of upper arm.
My 2nd email:
Many thanks Dr Rose
It's just that I read an old 'Golfwrx' forum post (dated 2014) the following (I think it's from a person called Jeff Martin) :
"The TPI AMM system does not measure shoulder IR/ER. The TPI forearm supination data actually reflects the combined rotation of the humerus and forearm. So two players can have identical lead forearm supination numbers in a TPI report, but do it completely differently. "
So just thought I'd check it out with you.
Dr Rose 2nd reply:
We actually have one sensor on the arm and one on the forearm. We don’t need shoulder internal and external rotation to give you forearm pronation and supination amounts. With that said it is true that you can get forearm pronation/supination in multiple ways. You can do it by moving the arm or by moving the forearm, both ways will affect our reading number. But the number is definitely forearm only.
Hope that makes sense
My 3rd email:
Dear Dr Rose
So just to confirm my understanding.
1. Forearm rotation measurement on TPI AMM is its rotation in space measured relative to some reference point?
2. It does not provide forearm rotation value relative to the upper arm?
Now awaiting an answer.
Can't understand why this is becoming so difficult to get (what I perceived to be) an easy answer.
DG
Addendum:
Dr Rose 3rd Reply:
Forearm rotation is 100% relative to upper arm position. Just remember we digitize with the arm at 90° with the thumb pointing up and the arm by their side. That’s the zero starting point.
Looks like Jeff Martin post was wrong!!!
I am getting some very confused definitions of lead forearm rotation for those TPI graphs :
Jeff Martin said the following in an old Golfwrx thread dated 2014:
""The TPI AMM system does not measure shoulder IR/ER. The TPI forearm supination data actually reflects the combined rotation of the humerus and forearm. So two players can have identical lead forearm supination numbers in a TPI report, but do it completely differently. "
I emailed Dr Greg Rose to confirm:
My 1st email:
Dear Dr Rose
With regards the Lead Wrist blue graph (Sup-Pro) , does that relate to just independent forearm rotation or is it a sum of 'upper arm & forearm rotation'?
Dr Rose 1st reply:
it is for forearm independent of upper arm.
My 2nd email:
Many thanks Dr Rose
It's just that I read an old 'Golfwrx' forum post (dated 2014) the following (I think it's from a person called Jeff Martin) :
"The TPI AMM system does not measure shoulder IR/ER. The TPI forearm supination data actually reflects the combined rotation of the humerus and forearm. So two players can have identical lead forearm supination numbers in a TPI report, but do it completely differently. "
So just thought I'd check it out with you.
Dr Rose 2nd reply:
We actually have one sensor on the arm and one on the forearm. We don’t need shoulder internal and external rotation to give you forearm pronation and supination amounts. With that said it is true that you can get forearm pronation/supination in multiple ways. You can do it by moving the arm or by moving the forearm, both ways will affect our reading number. But the number is definitely forearm only.
Hope that makes sense
My 3rd email:
Dear Dr Rose
So just to confirm my understanding.
1. Forearm rotation measurement on TPI AMM is its rotation in space measured relative to some reference point?
2. It does not provide forearm rotation value relative to the upper arm?
Now awaiting an answer.
Can't understand why this is becoming so difficult to get (what I perceived to be) an easy answer.
DG
Addendum:
Dr Rose 3rd Reply:
Forearm rotation is 100% relative to upper arm position. Just remember we digitize with the arm at 90° with the thumb pointing up and the arm by their side. That’s the zero starting point.
Looks like Jeff Martin post was wrong!!!