The pulling-up phase in the chin-up is caused by:
A. concentric activity in the elbow extensors, shoulder joint abductors and shoulder girdle abductors, and elevators and upward rotators.
B. concentric activity in the elbow flexors, shoulder joint adductors and shoulder girdle adductors, and depressors and downward rotators.
C. eccentric activity in the elbow extensors, shoulder joint abductors and shoulder girdle abductors, and elevators and upward rotators.
D. eccentric activity in the elbow flexors, shoulder joint adductors and shoulder girdle adductors, and depressors and downward rotators.
B. concentric activity in the elbow flexors, shoulder joint adductors and shoulder girdle adductors, and depressors and downward rotators.
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