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KMID : 0608320170240040038
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Physical Therapy Korea
2017 Volume.24 No. 4 p.38 ~ p.45
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A Comparative Study of Optimal Stretch Intensity For Flexibility of Hamstrings; Hand Held Dynamometer and Verbal Rating Scale
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Choi Bong-Sam
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Abstract
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Background: To improve muscle flexibility, static stretch is the most common type and is considered safe and effective for improving overall flexibility of muscles. During the stretch, the intensity is more likely to be determined by the degree of an athlete’s pain and practitioner’s skills rather than quantitative measures of stretch. It is necessary to determine the optimal intensity for the stretch.
Objects: The purpose of this study is to explore the relationship between hand held dynamometer (HHD) and verbal rating scale (VRS) in comparison of the effects of continuance time on active (walking) and inactive (sitting) movement after static stretch.
Methods: A cross-sectional study was conducted with a sample (n=62) recruited from a university. Participants were randomly assigned to 2 different groups (n=31 for each group) based on participants’ positions either remaining in sitting or freely walking around for a series of re-assessments. Data was collected at pre-warm up, pre-stretch, post-stretch, and additional assessments at the time of 3, 6, 9, 12, 15, 20 and 30 minutes after the stretch.
Results: Relationship between VRS and HHD scores represents very weak correlation (spearman’s ρ=-.16, p>.05). Pearson’s correlation analysis was conducted following the logarithmic transformation of the two scores. Pearson’s correlation after the transformation still showed a very low relationship and a poor linear relationship between the two scores (Pearson’s r=-.18, p>.05).
Conclusion: The optimal intensity for stretch cannot be solely determined by the subjective pain perception. The objective measurement such as HHD could be used in conjunction with the pain perception.
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KEYWORD
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Athelete, Measurement, Muscle stretch exercise, Range of motion
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