Sequence-dependent rotation axis changes and interaction torque use in overarm throwing.
We examined the role of rotation axes during an overarm throwing task. Participants performed such task and were asked to throw a ball at maximal velocity at a target. The purpose of this study was to examine whether the minimum inertia axis would be exploited during the throwing phases, a time when internal-external rotations of the shoulder are particularly important. A motion capture system was used to evaluate the performance and to compute the potential axes of rotation (minimum inertia axis, shoulder-centre of mass axis and the shoulder-elbow axis). More specifically, we investigated whether a velocity-dependent change in rotational axes can be observed in the different throwing phases and whether the control obeys the principle of minimum inertia resistance. Our results showed that the limbs' rotational axis mainly coincides with the minimum inertia axis during the cocking phase and with the shoulder-elbow axis during the acceleration phase. Besides these rotation axes changes, the use of interaction torque is also sequence-dependent. The sequence-dependent rotation axes changes associated with the use of interaction torque during the acceleration phase could be a key factor in the production of hand velocity at ball release.
a Univ Paris-Sud. UR CIAMS, EA 4532 - Motor Control & Perception team , France.|b Sorbonnes Universités, Université de Technologie de Compiègne (UTC) , UMR CNRS 7338, France.
Clint
C
Hansen
c Université de Toulon , HandiBio , France.
Nasser
N
Rezzoug
c Université de Toulon , HandiBio , France.
Philippe
P
Gorce
d Department of Engineering, GVLab , Tokyo University of Agriculture and Technology , Japan.
Gentiane
G
Venture
a Univ Paris-Sud. UR CIAMS, EA 4532 - Motor Control & Perception team , France.
Brice
B
Isableu
D000328:Adult; D001132:Arm; D004550:Elbow; D006801:Humans; D008297:Male; D009068:Movement; D012399:Rotation; D012782:Shoulder; D013177:Sports; D013647:Task Performance and Analysis; D019415:Torque; D055815:Young Adult
Proprioception; minimum inertia resistance principle; overarm throwing; rotational movements; sensory-motor tactics