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Hello and welcome to JA. Dr Saleem here. Will be answering you shortly
Hi, so please describe the symptoms bit more in detail
How old are you? Gender plz.
Are you overweight?
Does bending your wrist lead to tingling or pins and needles sensations in your hand / forearm?
How far into the activity do you start feeling this? After how long?
Alright ,well the possibilities include a pinched nerve esp when you bend your wrist or forearm in certain positions. One pretty common condition is called Carpel tunnel syndrome. Its a slowly progressive condition whereby median nerve supplying your hand gets compressed at wrist . Especially in the overweight and activities involving bending wrist too frequently.
It can present with symptoms like weakness, pins amd needles ,tingling etc. These symptoms can evolve over time.
To prevent this you need to give it rest, use a wrist brace/ splint, take antiinflammatory med like naproxen and preferably get an EMG/ NCS test that would exactly tell us about the pinched nerve.
Do you feel weakness anywhere else in your body too ?
Its involving just one arm actually so it has to something very localized to that area and with the description you gave it has to be either a nerve or a muscle. EMG NCS pretty much pick any abnormalities in both so thats tricky.
Third thing is blood circulation. So it you need a doppler ultrasound on your arm blood vessels to check the flow. Although it seems less likely of the three.
Hope it helped
I dont see anything too alarming there esp with EMG NCS being normal. Sports related arm / hand weakness is pretty common and you just need to keep your electrolytes replenished after exercise. Well hydrated too.
You are welcome.
Wish you a healthy life