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A comparison of pain level and entropy changes following core stability exercise intervention.

Lee T, Kim YH, Sung PS - Med. Sci. Monit. (2011)

Bottom Line: Pain level decreased significantly for all subjects (F=25.29, p=0.001), but there was no difference between groups (F=0.42, p=0.52).The entropy level decreased in both thoracic ES muscles following intervention in the exercise group, while remaining the same in the control group.In addition, the results also suggested that complexity is related to muscle fatigue, which corresponds to the values of entropy between groups.

View Article: PubMed Central - PubMed

Affiliation: Department of Healthcare Management, College of Health Science, Korea University, Seoul, Republic of Korea.

ABSTRACT

Background: As reported in our previous studies, the complexity of physiologic time series is a sensitive measure of muscle fatigability. This study compared the differences between 2 different analyses following 4 weeks of core stability exercises (CSE) in subjects with and without chronic low back pain (LBP). We examined whether the observed Shannon (information) entropy, as compared with median frequency (MF), was able to differentiate fatigability of the thoracic and lumbar parts of the erector spinae (ES) muscles following the intervention.

Material/methods: In total, 32 subjects participated in this study. There were 13 subjects in the CSE intervention group (average age 50.4 ± 9.1 years) and 19 subjects in the control group (average age 46.6 ± 9.1 years). The CSE group performed the specific exercise intervention, but the control group was asked to maintain their current activity and/or exercise levels. The endurance of the back muscles was determined by using a modified version of the isometric fatigue test as originally introduced by Sorensen.

Results: Pain level decreased significantly for all subjects (F=25.29, p=0.001), but there was no difference between groups (F=0.42, p=0.52). The MF was not different between groups following treatment (F=0.81, p=0.37). Although there was no entropy level changes following treatment (F=0.01, p=0.93), the interactions between muscles and groups following treatment were significant (F=7.25, p=0.01). The entropy level decreased in both thoracic ES muscles following intervention in the exercise group, while remaining the same in the control group.

Conclusions: Although the change in pain level was not different between groups, the Shannon entropy measure more sensitively differentiated the exercise intervention than did MF. In addition, the results also suggested that complexity is related to muscle fatigue, which corresponds to the values of entropy between groups. Further studies are needed to investigate the effectiveness of nonlinear time series of EMG data for fatigability.

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Related in: MedlinePlus

Pain changes based on million visual analogue scale (MVAS) following intervention. Pain in the low back was measured using a horizontal analogue scale, with options ranging from 0 to 100 mm, in which 100 mm reflected the worst pain imaginable. The pain level decreased significantly (F=25.29, p=0.001), but there was no difference between groups (F=0.42, p=0.52).
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f2-medscimonit-17-7-cr362: Pain changes based on million visual analogue scale (MVAS) following intervention. Pain in the low back was measured using a horizontal analogue scale, with options ranging from 0 to 100 mm, in which 100 mm reflected the worst pain imaginable. The pain level decreased significantly (F=25.29, p=0.001), but there was no difference between groups (F=0.42, p=0.52).

Mentions: Before the intervention, the pain level was 41.11±12.8 for the CSE group and 32.85±11.9 for the control group (Figure 2). However, following intervention, the pain level was 31.94±14.2 for the CSE group and 20.93±11.59 for the control group. The pain level decreased significantly for the control group (t=4.24, p=0.001) as well as for the CSE group (t=3.08, p=0.01). However, the results of the repeated measure analysis indicated that there was no difference in pain reduction between groups (F=0.42, p=0.52).


A comparison of pain level and entropy changes following core stability exercise intervention.

Lee T, Kim YH, Sung PS - Med. Sci. Monit. (2011)

Pain changes based on million visual analogue scale (MVAS) following intervention. Pain in the low back was measured using a horizontal analogue scale, with options ranging from 0 to 100 mm, in which 100 mm reflected the worst pain imaginable. The pain level decreased significantly (F=25.29, p=0.001), but there was no difference between groups (F=0.42, p=0.52).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3539569&req=5

f2-medscimonit-17-7-cr362: Pain changes based on million visual analogue scale (MVAS) following intervention. Pain in the low back was measured using a horizontal analogue scale, with options ranging from 0 to 100 mm, in which 100 mm reflected the worst pain imaginable. The pain level decreased significantly (F=25.29, p=0.001), but there was no difference between groups (F=0.42, p=0.52).
Mentions: Before the intervention, the pain level was 41.11±12.8 for the CSE group and 32.85±11.9 for the control group (Figure 2). However, following intervention, the pain level was 31.94±14.2 for the CSE group and 20.93±11.59 for the control group. The pain level decreased significantly for the control group (t=4.24, p=0.001) as well as for the CSE group (t=3.08, p=0.01). However, the results of the repeated measure analysis indicated that there was no difference in pain reduction between groups (F=0.42, p=0.52).

Bottom Line: Pain level decreased significantly for all subjects (F=25.29, p=0.001), but there was no difference between groups (F=0.42, p=0.52).The entropy level decreased in both thoracic ES muscles following intervention in the exercise group, while remaining the same in the control group.In addition, the results also suggested that complexity is related to muscle fatigue, which corresponds to the values of entropy between groups.

View Article: PubMed Central - PubMed

Affiliation: Department of Healthcare Management, College of Health Science, Korea University, Seoul, Republic of Korea.

ABSTRACT

Background: As reported in our previous studies, the complexity of physiologic time series is a sensitive measure of muscle fatigability. This study compared the differences between 2 different analyses following 4 weeks of core stability exercises (CSE) in subjects with and without chronic low back pain (LBP). We examined whether the observed Shannon (information) entropy, as compared with median frequency (MF), was able to differentiate fatigability of the thoracic and lumbar parts of the erector spinae (ES) muscles following the intervention.

Material/methods: In total, 32 subjects participated in this study. There were 13 subjects in the CSE intervention group (average age 50.4 ± 9.1 years) and 19 subjects in the control group (average age 46.6 ± 9.1 years). The CSE group performed the specific exercise intervention, but the control group was asked to maintain their current activity and/or exercise levels. The endurance of the back muscles was determined by using a modified version of the isometric fatigue test as originally introduced by Sorensen.

Results: Pain level decreased significantly for all subjects (F=25.29, p=0.001), but there was no difference between groups (F=0.42, p=0.52). The MF was not different between groups following treatment (F=0.81, p=0.37). Although there was no entropy level changes following treatment (F=0.01, p=0.93), the interactions between muscles and groups following treatment were significant (F=7.25, p=0.01). The entropy level decreased in both thoracic ES muscles following intervention in the exercise group, while remaining the same in the control group.

Conclusions: Although the change in pain level was not different between groups, the Shannon entropy measure more sensitively differentiated the exercise intervention than did MF. In addition, the results also suggested that complexity is related to muscle fatigue, which corresponds to the values of entropy between groups. Further studies are needed to investigate the effectiveness of nonlinear time series of EMG data for fatigability.

Show MeSH
Related in: MedlinePlus