Journals Information
International Journal of Human Movement and Sports Sciences Vol. 8(5), pp. 186 - 192
DOI: 10.13189/saj.2020.080505
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Effects of Progressive Increased Intensity of PNF Stretching on Hamstring Force and Flexibility
Wootaek Lim 1,2,*
1 College of Health and Welfare, Woosong University, Republic of Korea
2 Woosong Institute of Rehabilitation Science, Woosong University, Republic of Korea
ABSTRACT
In most previous studies of PNF stretching performed at different intensities, the subjects were provided with the intensities in a randomized order. In addition, subjects were aided in maintaining a steady level of contraction force using a dynamometer as visual feedback. However, such a procedure differs from the procedure used in actual clinical settings. This study aimed to examine the effect of the applied order of three different intensities of PNF stretching on the ability to regulate the contraction force and increase muscle flexibility. During the 1st period, three different stretching intensities were applied in the order of 25%, 50%, and 75% of MVC in the group A and in the order of 75%, 50%, and 25% of MVC in the group B. This order was reversed during the 2nd period. The contraction force was measured using the strain gauge and hamstring flexibility was measured using active knee extension. There was no significant difference between target and contraction intensity at three target intensities in both groups. Additionally, contraction forces between different intensities clearly were distinguished by subjects in both groups. In Group A, increase in flexibility was significantly higher in the 1st period than in the 2nd period. Healthy adults could clearly differentiate and regulate contraction intensity when the intensities were differentially applied at 25% intervals. The higher target intensity compliance and increase in flexibility may be anticipated when progressively increase intensity was applied, compared to the same factors in reverse order.
KEYWORDS
Hamstring Muscles, Isometric Contraction, Proprioceptive Neuromuscular Facilitation Stretching, Range of Motion
Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Wootaek Lim , "Effects of Progressive Increased Intensity of PNF Stretching on Hamstring Force and Flexibility," International Journal of Human Movement and Sports Sciences, Vol. 8, No. 5, pp. 186 - 192, 2020. DOI: 10.13189/saj.2020.080505.
(b). APA Format:
Wootaek Lim (2020). Effects of Progressive Increased Intensity of PNF Stretching on Hamstring Force and Flexibility. International Journal of Human Movement and Sports Sciences, 8(5), 186 - 192. DOI: 10.13189/saj.2020.080505.