Muscle fatigability can be tested for many muscles. A thorough investigation includes:
- looking upward and sidewards for 30 seconds: ptosis and diplopia
- looking at the feet while lying on the back for 60 seconds
- keeping the arms stretched forward for 60 seconds
- ten deep knee bends
- walking 30 steps on both the toes and the heels
- five situps, lying down and sitting up completely
- "Peek sign": after complete initial apposition of the lid margins, they quickly (within 30 seconds) start to separate and the sclera starts to show
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