Physiologic tremor

Physiologic tremor
Differential diagnosis	Hyperthyroidism

Physiologic tremor is a tremor or trembling of a limb or other body part. The usual frequency is about 10 times per second. It occurs in normal individuals, especially when they are stressed by anxiety or fatigue. It is therefore common in sports such as rock-climbing where it is known by names such as Elvis leg or sewing machine leg.[1] It may occur in an enhanced form as a pathological symptom of conditions such as hyperthyroidism or stimulants such as caffeine.[2]

References

Peter Beal (2011), Bouldering: Movement, Tactics, and Problem Solving, ISBN 978-1594855016, Elvis leg: Uncontrollable shaking in the lower leg caused by fear and fatigue. Best prevented by relaxing and dropping your heels when standing on footholds
William W. Campbell (2012), "Abnormalities of Movement", DeJong's The Neurologic Examination, Lippincott Williams & Wilkins, p. 495, ISBN 978-1469817521

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[1] Peter Beal (2011), Bouldering: Movement, Tactics, and Problem Solving, ISBN 978-1594855016, Elvis leg: Uncontrollable shaking in the lower leg caused by fear and fatigue. Best prevented by relaxing and dropping your heels when standing on footholds

[2] William W. Campbell (2012), "Abnormalities of Movement", DeJong's The Neurologic Examination, Lippincott Williams & Wilkins, p. 495, ISBN 978-1469817521