Kinematic characteristics of the scapula and clavicle during military press exercise and shoulder flexion.
BACKGROUND
The military press is an exercise frequently prescribed for scapular and shoulder rehabilitation. Although this exercise has previously been analyzed by electromyography, its kinematic features remain poorly understood. In this study, we aimed to clarify these features of the military press and suggest relevant clinical applications.


METHODS
Sixteen healthy men participated in this study. The participants performed the military press while holding 2 kg weights, as well as shoulder flexion with and without 2 kg weights, and an electromagnetic motion capture system was used to analyze the kinematic features of the scapula, clavicle, and humerus during these exercises. The motions of the scapula and clavicle were analyzed at 10° increments of shoulder flexion from 30° to 120°.


RESULTS
The military press involved less scapular internal rotation, greater upward rotation, and greater posterior tilt than shoulder flexion with or without weights, especially in the starting to middle range of shoulder flexion. Greater clavicular retraction and elevation were also seen during the military press.


CONCLUSIONS
The movements of the scapula and clavicle during the military press differ significantly from those during shoulder flexion with and without weights. The kinematic features of the military press, which involved less scapular internal rotation, greater upward rotation, and greater posterior tilt than did shoulder flexion, may make it a useful re-education exercise (if pain allows) for patients with decreased scapular external rotation, upward rotation, and posterior tilting. The results of this study might provide a kinematic basis for the use of this widely performed shoulder exercise.
Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan. Electronic address: ichihashi.noriaki.5z@kyoto-u.ac.jp.
Noriaki
N
Ichihashi
Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
Satoko
S
Ibuki
ASICS Corporation, Institution of Sport Science, Kobe, Japan.
Naoki
N
Otsuka
ASICS Corporation, Institution of Sport Science, Kobe, Japan.
Shingo
S
Takashima
Kyoto University Hospital, Kyoto, Japan.
Aoi
A
Matsumura
D001696:Biomechanical Phenomena; D002968:Clavicle / Q000502:physiology*; D006801:Humans; D006811:Humerus / Q000502:physiology*; D008297:Male; D016059:Range of Motion, Articular; D012399:Rotation; D012540:Scapula / Q000502:physiology*; D012785:Shoulder Joint / Q000502:physiology*; D014891:Weight Lifting / Q000502:physiology*; D055815:Young Adult
Scapular motion; biomechanics; military press; multi-joint movement; rehabilitation; shoulder flexion