Rigid muscle/Muscle weakness
Another sign of Parkinson’s disease is a condition known as Acute and Progressive Exertional Myoclonus (APEM). Simply put, progressive muscle weakness in the hands and feet (particularly the toes). We are no longer talking about the common cold. The hand muscles are affected in APEM, which includes: the thumb, middle finger, and ring finger, the index finger, little finger, pinkie, pointer finger, and first three fingers of the hand.
However, it may not occur only in the fingers, and it could be in any other muscle in the body. And also results in a bad posture since the strength in a part of the body is not holding up. This sign should not be nurtured as it could get a lot more severe.