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...International journal of human movement and sports sciences http www hrpub org doi saj effects progressive increased intensity pnf stretching on hamstring force flexibility wootaek lim college health welfare woosong university republic korea institute rehabilitation science received july revised august accepted september cite this paper in the following citation styles a vol no pp b copyright by authors all rights reserved agree that article remains permanently open access under terms creative commons attribution license abstract most previous studies proprioceptive neuromuscular facilitation performed at different intensities subjects were range motion provided with randomized order addition aided maintaining steady level contraction using dynamometer as visual feedback however such procedure differs from introduction used actual clinical settings study aimed to examine effect applied three mechanism behind ability regulate muscle increase during still partly unclear an st period has ...