Please help! What can be done to prevent heavy feeling all over the body?

[George_Zappa]

Following an ischemic stroke (vertebrobasilar) a few years ago, my father is having this feeling that his body weights a ton.
This heaviness is distributed all over his body and he feels like is sustaining the weight of a few people. This installed gradually during a year time: first time he felt it was on his back, after that: below his chin, on his limbs, abdomen.
Despite his condition (tetraparesis) he is working out every day helped by my mother and he feels like he could walk if he can overcome this heaviness.
Please help us: any idea what is causing this or what can be done to improve his condition? What medical advice do you have for us? What tests to take?  Any remedies? I really appreciate any answer, any opinion.
It could or it could not be related to the stroke as the main cause?

[George_Zappa]

Thank you so much for your answer,I really appreciate it.
Is the tightness making him feel like he is so heavy?  Does this "heavy feeling" normally occur after a stroke? We didn't have any answers for this heavy feeling from his neurologist here in Romania.
His perception of heavyness could be something else? (like in referred pain). The heaviness "moved" from one place to another of his body, and after a few months he ended up feeling like his whole body weights a ton.
At this point we need to know if the heaviness that he feels is related to the stroke itself or it could be something like vitamin deficiency or a side effect from his medication or any other causes.

[Paderla Anitha, DNB]

Hi, ischemic stroke occurs as a result of blockage to an artery. For this therapy with clot dissolving drugs (thrombolytics), should be initiated early. Aspirin, an anti-thrombotic drug, is given immediately after an ischemic stroke to reduce the likelihood of having another stroke. Tissue plasminogen activator (TPA), needs to be given within 4.5 hours after stroke symptoms, this restores the blood supply to the affected part.

After suffering a stroke, many people experience post-stroke spasticity, muscle tightness that impairs mobility. Botox injections can help with this tightness. Also, Intrathecal baclofen therapy is known to help with the tightness. It involves the surgical implantation of a pump. The medication which is contained in the pump is delivered and it goes directly into the spinal canal. Regards.