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Experimental design. The thicker lines represent the period during which weights were used to change the muscular tension of the arm. Groups 2 and 4 wore 750-gram bracelets, whereas groups 3 and 5 wore 1500-gram bracelets. (PRE) Throws before donning 30-diopter lenses; (PRI) throws with the lenses on; (POS) throws after removing the lenses.
