Some researches have defined the instant of ball release as " Ball release was defined as the first frame in which the basketball left the participant’s hand. ". However, as I hadn't any marker on the ball, I can't use from this definition.
Please let me know, how can I estimate the instant of ball release in basketball free throw by some variables such as elbow and wrist angels ( the peak of extension of elbow joint and or the peak of flexion of wrist joint)?
I'm looking forward to see your informative comments.
Regards,
Esmaeel,
hi
I belive there is many ways for this work. but only one of them is best. The best condition is when you have a marker on the ball. But because you have not done it, It is best to check the wrist joint changes. In my opinion, when the ball is released that wrist angle (the angle between the hand and forearm ) is 180 degrees (they are in one line).
Think on this solution.
Best Regards,
Hesam Ramezanzade
Hi Esmaeel,
First, could you explain why you want to know the instant of ball release? Are you trying to compare with previous research? Or are you trying to answer a specific research question? How accurate do you have to be?
Second, could you elaborate on what data you have measured?
Frankly, I don't think you can reliably detect the instant of ball release if you only have joint angle data. Sure, you can estimate it happens at for example the the peak velocity of the wrist angle, but you will never be entirely accurate due to (functional) variability. Ultimately, you would have to validate your assumption that instant of release and some variable of joint angles are related.
Good luck,
Rens
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