Jendrassik handle
The Jendrassik handle (en. Jendrassik's maneuver ) is an examination maneuver named after the Hungarian neurologist Ernő Jendrassik (1858–1921).
Muscular tension in the arms eases ( eases ) the leg reflexes and makes them easier to test. The patient crosses his hands and pulls them firmly apart; arms bent in front of the torso.
Similarly, the patient is allowed to bite his teeth vigorously when reflexes of the arms are to be tested.
The facilitation comes about through the convergence (summation) of two or more subliminal stimuli, which lead to a supra-threshold depolarization in the motor neurons. The procedure is now also used in exercise physiology, as the increased tendon reflex also favors the stretching-shortening cycle and thus rapid strength performance . The Jendrassik handle in the tooth-bite version has been well researched, especially in martial arts, due to the (sometimes mandatory) use of mouthguards.
Individual evidence
- ↑ E.Jendrassik: contributions to the theory of the tendon reflexes. Deutsches Arch. Klin. Med 33 (1883), 177-199.
- ↑ Arnd Krüger : Clench your teeth. Performance sports 47 (2017), 6, 35-36
- ↑ C. Cetin et al .: Influence of custom made mouth guards on strength, speed and anaerobic performance of taekwondo athletes. Dent. Traumatol. 25 (2009), 3, 272-276
