Biceps eller triceps til sprint!

[RuneB]

http://www.elitetrack.com/article_files/yo...ngmechanics.pdf

Arm Swing

The role of the arm swing remains a rather controversial topic among sprint

coaches. Some believe the arm swing is crucial to performance and significantly

contributes to horizontal propulsive forces. A deeper examination, however, reveals that

the role of the arms may not be as significant as previously thought and they may serve a

different function than previously believed. Research evidence suggests that the arms do

not contribute directly to forward movement or horizontal propulsive forces (Hinrichs,

1987). The horizontal force capabilities of the arms are very limited due to the

simultaneous forward-backward action of contralateral arms. That is, although the

forward swinging arm has the ability to generate horizontal propulsive forces, any benefit

is cancelled out by the opposite action of the contralateral arm moving backwards.

The arm swing does, however, serve two important roles. The first of these is to

counterbalance the rotary momentum of the legs (Hinrichs et al., 1987; Mann &

Hermann, 1985). If it were not for the action of the arms, an athlete would not be able to

control the rotation of their trunk caused by the unilateral action of the legs. The second

role that the arm swing serves is to enhance vertical propulsive forces. Research evidence

indicates that the arms may contribute up to 10% of the total vertical propulsive forces an

athlete is capable of applying to the ground (Hinrichs, 1987). This is because unlike the

spatial phase difference of the arm swing in the forward-backward direction, both arms

are synchronized in their upward and downward movement. As a result, there is no

cancellation of their affect in the vertical direction and the synchronized upward

movement of both arms is able to contribute to the vertical propulsive forces an athlete

can apply to the ground. In light of these considerations, an optimal arm swing is one

which is symmetrical and roughly matches the timing and magnitude of movement of the

legs. Efficient sprinters exhibit an arm swing that originates from the shoulder and has a

flexion and extension action at the shoulder and elbow that is commensurate to the

flexion and extension occurring at the ipsilateral shoulder and hip.

[RuneB]

jeg var test person i et forskningsforsøg omkring armsving.

jeg havde et løb uden arm og et med. Det var stor forskel i min sprint tid.

En af de bedre sprint i danmark prøvede det også, hans forskel var langt mindre.

forskellen tror jeg var grundet teknik, han rotere sigen hofte langt mindre end mig,.

jeg tror det var et bachelor projekt. kan det passe ferus at du tog fejl i forhold til det..

Edited July 17, 2009 by RuneB

[Søren W]

Der er vel heller ingen, der siger at armenes rolle er ligegyldig, men at muskelstyrke i armene skulle være en begrænsende faktor, har jeg stadig meget svært ved at tro på.

[Ferus]

jeg tror det var et bachelor projekt. kan det passe ferus at du tog fejl i forhold til det..

Er ikke sikker nej

[RuneB]

Enig...dit argument omkring newton giver også mening... jeg mange bare en forklaring på dette:

Research evidence indicates that the arms may contribute up to 10% of the total vertical propulsive forces an athlete is capable of applying to the ground (Hinrichs, 1987)

jeg kan desværre ikke finde studiet..

Edited July 17, 2009 by RuneB