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http://dx.doi.org/10.21598/JKPNFA.2022.20.3.383

Effects of Three-Week Contract-Relax Interventions with and without Reinforcement Using Temporal Summation for Flexibility and Balance Ability in Young People with Hamstring Shortening  

Kim, Yong-Hun (Department of Physical Therapy, Masan University)
Park, Du-Jin (Department of Physical Therapy, College of Health Sciences, Catholic University of Pusan)
Publication Information
PNF and Movement / v.20, no.3, 2022 , pp. 383-390 More about this Journal
Abstract
Purpose: The purpose of this study was to examine the effect of three-week contract-and-relax (CR) interventions with and without reinforcement using temporal summation for flexibility and dynamic balance ability in young people with hamstring shortening. Methods: This study was conducted on 20 female college students with hamstring shortening. The participants were divided equally into two groups using stratified randomization: the CR group (CRG) and the CR with reinforcement group (CRRG). All interventions were applied three times a week for three weeks. The passive straight leg raise (PSLR) test and functional reaching test (FRT) were conducted on each participant before and after the three-week intervention. Results: In both groups, PSLR and FRT improved significantly after the three-week intervention compared to before intervention (p < 0.01). The amount of change in PSLR after the three-week intervention was significantly higher in CRRG than in CRG (p < 0.05). Conclusion: Three-week CR interventions with and without reinforcement were effective in improving PSLR and FRT. To improve hamstring shortening, CR intervention with reinforcement may be more useful than CR intervention without reinforcement.
Keywords
proprioceptive neuromuscular facilitation; contract and relax; reinforcement; hamstring; flexibility; balance;
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