This allows the vehicle to have higher torsional rigidity with less weight. The silica core confers rigidity and thermal stability. It combined the car's low weight with a high amount of torsional rigidity and safety. Collagenous function includes rigidity and elasticity. Reinforcements to the body shell improve overall chassis rigidity. Chassis improvements resulted in higher rigidity and less weight. It also vastly improved the lateral rigidity. Parkinsonism is a clinical syndrome characterized by tremor, bradykinesia, rigidity, and postural instability. This arrangement reduces weight and engine length at the expense of reduced crankshaft rigidity. Each layer of boards is placed cross-wise to adjacent layers for increased rigidity and strength. It typically manifests as bradykinesia, rigidity, resting tremor and posture instability. Updated frame rigidity and engine mounting position improved handling. It improves tremor, and may alleviate rigidity and bradykinesia. However, all insist on the importance of a natural relaxed position without tension or rigidity. It improves tremor but not rigidity or bradykinesia.