מקבילים וצורת חזה (ליאו?)

[shikoLM]

פורסם במקור על ידי amir harduf

לא יודעים בכלל אם אפש לעבוד על ראש אחד בחזה יותר מהשני, יצאו אפילו כמה מחקרים שמצאו שאי אפשר.. תעבוד חופשי נו מה אתה עושה צחוק

כשתוכל תעלה את המחקרים המדוברים, בינתיים זה מה שמצאתי.

Effects of Variations of the Bench Press Exercise on the EMG Activity of Five Shoulder Muscles
Chris Barnett and Peter Turner

Department of Human Movement Studies, The University of Queensland, Brisbane, Australia 4072.
Vaughan Kippers

Department of Anatomical Sciences, The University of Queensland, Brisbane, Australia 4072.

This experiment investigated the effects of varying bench inclination and hand spacing on the EMG activity of five muscles acting at the shoulder joint. Six male weight trainers performed presses under four conditions of trunk inclination and two of hand spacing at 80% of their predetermined max. Preamplified surface EMG electrodes were placed over the five muscles in question. The EMG signals during the 2-sec lift indicated some significant effects of trunk inclination and hand spacing. The sternocostal head of the pectoralis major was more active during the press from a horizontal bench than from a decline bench. Also, the clavicular head of the pectoralis major was no more active during the incline bench press than during the horizontal one, but it was less active during the decline bench press. The clavicular head of the pectoralis major was more active with a narrow hand spacing. Anterior deltoid activity tended to increase as trunk inclination increased. The long head of the triceps brachii was more active during the decline and flat bench presses than the other two conditions, and was also more active with a narrow hand spacing. Latissimus dorsi exhibited low activity in all conditions.