Hey guys this is a weird one that happened during weighted pull-ups. Two months ago, on the come up I got a very strong pain through my forearm, no pop or anything.
At that time when I tried to flex my bicep in a pronated position I noticed some pain where the distal tendon attached to the muscle belly, some pain where the distal tendon attaches to the forearm, and some pain in the brachioradialis almost inside the elbow. However there was no disfigurement of the bicep. I gave it some rest then slow rehab for a month and now my supinated curls are back to where they were with no issues.
The weird thing is when I curl neutral grip (hammer curl) I can’t go above 20lb dumbbells (normally do 40-50) without immediately feeling like my brachioradialis is taking all the weight and straining under it. With my uninjured arm I can whip that weight around like it’s nothing.
What really concerns me is that I also noticed that it takes a concerted effort to contract my bicep to where it’s anywhere close to as hard as the uninjured arm. And can poke my finger into it a good centimeter whereas the uninjured arm I can barely poke into it at all. This gets worse the more I twist my wrist into a pronated position when compared to the uninjured arm its like jelly. Still contracts somewhat but jelly.
To add to that in a neutral and pronated position I can’t flex my bicep without significantly flexing my brachioradialis. In the uninjured arm the bracioradialis doesn’t flex at all and it’s only my bicep. Also in the injured arm I noticed my brachioradialis even flexes noticeably in the supinated position whereas in the uninjured arm it doesn’t flex at all.
I leaned into this maybe being a brachialis tear? If I grab a 5lb dumbell and hammer curl it for 100 reps with a concentrated effort of contracting the muscles in my upper arm I can avoid the pain in my forearm and feel a soreness on the outside of my upper arm (where I would feel the brachialis). Also my left uninjured upper arm has a noticeable pop of muscle on the outside (brachial probably) whereas my injured arm is almost flat by comparison.
Let me know what you guys think. I’m at a loss with whether I should rest it or rehab it.