Tokahfang
Moderator emeritus
- Joined
- Jan 31, 2010
- Messages
- 791
- Diagnosis
- 07/2009
- Country
- US
- State
- VA
- City
- Richmond
The reason you can go from benching 150 lbs to being unable to pass a clinical strength test a month later is because ALS causes neurological weakness. It isn't that your muscles don't have the potential to be strong, you become weak because your brain can't tell your muscles to use that potential, the nerve that carries the "use your potential!" signals is what isn't working. It's also why exercising can't improve neurological weakness.
This is much more obvious if you consider an easier to understand spinal problem: traumatic spinal cord injury. If you are in a ski accident this weekend and sever your spine, you very much will go from gym guy to paralyzed in much less than a month!
Now ALS is invisible to the eye, so I understand why it's harder to imagine it doing the same thing. But you have to remember that the ends of your lower motor neurons are constantly branching and trying to keep things going while they degenerate (this is what causes non-benign fasics), and so until that process of fighting for life is done, they carry those signals to the muscle. When they die off, whole parts of your muscle suddenly get no signal at all, and so clinical weakness shows up so fast it looks instantaneous from our human perspective.
At the core though, the ski accident and ALS cause weakness the same way - the brain isn't connected to the muscle or parts of the muscle and can't tell it to do things anymore.
This is much more obvious if you consider an easier to understand spinal problem: traumatic spinal cord injury. If you are in a ski accident this weekend and sever your spine, you very much will go from gym guy to paralyzed in much less than a month!
Now ALS is invisible to the eye, so I understand why it's harder to imagine it doing the same thing. But you have to remember that the ends of your lower motor neurons are constantly branching and trying to keep things going while they degenerate (this is what causes non-benign fasics), and so until that process of fighting for life is done, they carry those signals to the muscle. When they die off, whole parts of your muscle suddenly get no signal at all, and so clinical weakness shows up so fast it looks instantaneous from our human perspective.
At the core though, the ski accident and ALS cause weakness the same way - the brain isn't connected to the muscle or parts of the muscle and can't tell it to do things anymore.