Background: Static hamstring stretching exercises have been widely used to improve flexibility of the hamstring muscles. However, few studies have examined the influence of standing static hamstring stretching (e.g., jack-knife stretching) on movements of the lumbopelvic-hip complex. Objectives: To ...
Background: Static hamstring stretching exercises have been widely used to improve flexibility of the hamstring muscles. However, few studies have examined the influence of standing static hamstring stretching (e.g., jack-knife stretching) on movements of the lumbopelvic-hip complex. Objectives: To examine the short-term effects of jack-knife stretching on movements of the lumbopelvic-hip complex. Design: Case series. Methods: Fourteen participants with hamstring tightness (8 male, 6 female) were recruited. Participants performed jack-knife stretching for 150 s. Before and after stretching, participants performed the finger-to-floor distance (FFD), sit and reach (SRT), active knee extension (AKE), passive straight leg raising (PSLA), and active straight leg raising (ASLR) tests as well as pelvic tilt while standing to identify the effects of stretching. Results: There were significant improvements in the FFD, SRT, AKE, PSLA, and ASLR tests after stretching. However, pelvic tilt angle while standing did not significantly change. Conclusion: Jack-knife stretching can be a useful exercise to improve flexibility of the hamstring muscles, but not pelvic alignment while standing.
Background: Static hamstring stretching exercises have been widely used to improve flexibility of the hamstring muscles. However, few studies have examined the influence of standing static hamstring stretching (e.g., jack-knife stretching) on movements of the lumbopelvic-hip complex. Objectives: To examine the short-term effects of jack-knife stretching on movements of the lumbopelvic-hip complex. Design: Case series. Methods: Fourteen participants with hamstring tightness (8 male, 6 female) were recruited. Participants performed jack-knife stretching for 150 s. Before and after stretching, participants performed the finger-to-floor distance (FFD), sit and reach (SRT), active knee extension (AKE), passive straight leg raising (PSLA), and active straight leg raising (ASLR) tests as well as pelvic tilt while standing to identify the effects of stretching. Results: There were significant improvements in the FFD, SRT, AKE, PSLA, and ASLR tests after stretching. However, pelvic tilt angle while standing did not significantly change. Conclusion: Jack-knife stretching can be a useful exercise to improve flexibility of the hamstring muscles, but not pelvic alignment while standing.
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문제 정의
Thus, the aim of this study was to investigate how static hamstring stretching using the jack-knife stretching maneuver influences lower extremity movements and lumbopelvic kinematics. Given what is known about jack-knife stretching,11 this technique would improve lower extremity movement and lumbopelvic kinematics.
A previous study used only the FFD test to identify the effects of jack-knife stretching.11Thus, the present study examined the influence of jackknife stretching on several variables related to dynamic movements of the lower extremities.
제안 방법
All outcome variables were measured before performing jack-knife stretching, and then subjects performed jack-knife stretching. Immediately after jack-knife stretching, all outcome variables were measured again.
7 cm.11Although jack-knife stretching is considered an effective hamstring stretching technique, that study measured only FFD and not other variables related to hamstring flexibility.
To measure PSLR and ASLR, subjects were positioned in a supine position. For PSLR, an examiner flexed the subject’s hip while maintaining knee extension.
대상 데이터
For this study, 14 adults (8 males and 6 females, mean age: 21.43±2.31 years, height: 169.00±8.00 cm, body weight: 71.00±13.85 kg) with bilateral hamstring tightness were recruited.
데이터처리
To identify the effects of jack-knife stretching on outcome variables, paired t-tests were performed. If outcome variables violated the normal distribution, they were analyzed using Wilcoxon signed rank test. The α-value was set at .
Shapiro-Wilk test was used to verify the normal distribution of outcome variables. To identify the effects of jack-knife stretching on outcome variables, paired t-tests were performed. If outcome variables violated the normal distribution, they were analyzed using Wilcoxon signed rank test.
이론/모형
, Chicago, IL). Shapiro-Wilk test was used to verify the normal distribution of outcome variables. To identify the effects of jack-knife stretching on outcome variables, paired t-tests were performed.
성능/효과
These findings are similar to those of Bormann et al.22In that study, hamstring flexibility was significantly improved, whereas lumbar curvature while standing did not significantly change after 4 weeks of hamstring stretching in a sitting or standing position. Considering another previous study that showed no significant relationship between hamstring muscle length and lumbar lordosis,23 it is likely that standing pelvic alignment may be influenced by multiple factors in addition to hamstring muscle length.
후속연구
, back muscle length, abdominal muscle length, and so forth) that might influence pelvic alignment. Therefore, future research needs to identify possible factors influencing standing pelvic alignment.
참고문헌 (23)
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