The Effect of Active Knee Extension in Sitting on Lumbopelvic Curvature in Individuals with Clinically Tight Hamstring Muscles
Relative flexibility between the
hamstring and lumbar extensor muscles, which can be evaluated using lumbopelvic
curvature during active knee extension in sitting, can sometimes be assessed in
physical therapy. However, a quantitative measure of lumbopelvic curvature
during active knee extension in sitting has not been established yet, nor has
reliability for this test been reported. Therefore, it is necessary to
establish reliability of quantitative measures for physical assessments that
are used to identify specific subgroups and thus the reliability of the test to
assess lumbopelvic curvature during active knee extension in sitting.
In this study, the
authors aimed to establish reliability for measurement of lumbopelvic curvature
during active knee extension in sitting by considering the minimum number of
repetitions, inter-session reliability and inter-examiner reliability. And twenty-seven
individuals with clinically tight hamstring muscles were recruited. On two
separate sessions, the lumbopelvic curvature was evaluated in sitting when the
right knee was moved from 90° flexion to 10° flexion on 15 occasions
using a flexible ruler by two examiners on Day 1 and one on Day 2. Lines drawn
tangential to the lumbopelvic curvature were traced at T12 and S2 vertebral
levels and the angle between the two vertical lines was calculated. Using Day 1
data, the minimum number of repetitions and inter-examiner reliability were
assessed. Inter-session reliability was also examined.
As a result, there
was no statistical difference (P > 0.05) in the mean absolute
difference between the mean value of N-1 and N repetitions (6 ≤ N ≤ 15) in the
lumbopelvic curvature angle, indicating that five was considered the minimum
number of repetitions. Intraclass correlation coefficient (ICC)(1, 5) for
the inter-session reliability and ICC(2, 5) for the
inter-examiner reliability was 0.97 and 0.93, respectively, indicating
excellent reliability.
In conclusion, the
measure for the lumbopelvic curvature during active knee extension in sitting,
which was established in the current study, will be a foundation for further
research regarding the relative flexibility of the lumbar and adjunct regions.
Article by Musashi
Yasuda, et al, from Saitama Prefectural University, Koshigaya, Japan.
Full access: http://mrw.so/4s8Mh9
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