Abstract
Postural responses following slip perturbations are critical to fall prevention strategies. It is unclear how postural reactions with a handheld task can validly be transferred to treadmill-induced slip perturbations in subjects with recurrent low back pain (LBP). The purpose of this study was to investigate trunk reaction times and trunk flexion angle as well as velocity following the slips between subjects with and without LBP. There were 29 subjects with LBP and 40 control subjects who participated in the study. Three levels of consecutive treadmill-induced slip perturbations were introduced at level 1 (duration: 0.10 s, velocity: 0.24 m/s, displacement: 1.20 cm), level 2 (0.12 s, 0.72 m/s, 4.32 cm), and level 3 (0.12 s, 1.37 m/s, 8.22 cm). The trunk reaction time, swing/step times, and trunk flexion angle as well as velocity at heel strike/toe-off were compared between the groups. There were significantly longer trunk reaction times (t = − 2.03, p = 0.04), swing times (t = − 2.63, p = 0.01), and step times (t = − 2.53, p = 0.01) in the LBP group at the level 1 slip perturbation. The groups demonstrated a significant interaction between the levels and trunk flexion angles (F = 4.72, p = 0.03), but there was no interaction between the levels and trunk flexion velocities (F = 0.07, p = 0.79). The LBP group demonstrated longer reaction times at the level 1 perturbation due to a possible pain recurrence. However, this compensatory tolerance was limited at the level 3 perturbation due to increased trunk flexion angle at heel strike and toe-off in the LBP group. Clinicians may consider a compensatory strategy to improve reaction time and minimize trunk flexion following slip perturbations in patients with LBP.
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Change history
30 October 2018
This erratum is to correct the force plate device presented in the Methods section, subsection ?Data Collection.? A pressure mat, rather than a force plate was used with the ActiveStep? treadmill to measure ground reaction forces. The third sentence of the second paragraph should read as: ?The pressure mat (GAITRite, Sparta, NJ) was installed, and a computer-controlled triggering mechanism would release the movable belt on the platform.? Additionally, the first sentence of the third paragraph in the same section should read as: ?The flexion angle was measured at heel strike of the first step only, and flexion angle at toe-off was measured at first step only (represented in degrees) by the IMU sensor and the pressure mat.?
30 October 2018
This erratum is to correct the force plate device presented in the Methods section, subsection ?Data Collection.? A pressure mat, rather than a force plate was used with the ActiveStep? treadmill to measure ground reaction forces. The third sentence of the second paragraph should read as: ?The pressure mat (GAITRite, Sparta, NJ) was installed, and a computer-controlled triggering mechanism would release the movable belt on the platform.? Additionally, the first sentence of the third paragraph in the same section should read as: ?The flexion angle was measured at heel strike of the first step only, and flexion angle at toe-off was measured at first step only (represented in degrees) by the IMU sensor and the pressure mat.?
27 October 2020
This erratum is to correct the results section on page 490.
Abbreviations
- LBP:
-
Low back pain
- BMI:
-
Body mass index
- VAS:
-
Visual analog scale
- ODI:
-
Oswestry Disability Index
- ANOVA:
-
Analysis of variance
- r:
-
Pearson correlation coefficient
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Acknowledgments
This work was supported by Herbert H. and Grace A. Dow College of Health Professions at Central Michigan University (ION 42041-15647 and FRCE 48151).
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Institutional Review Board at Central Michigan University (955053-3).
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Central Michigan University (ION 42041-15647 and FRCE 48151).
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Associate Editor Dan Elson oversaw the review of this article.
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Sung, P.S., Danial, P. Trunk Reaction Time and Kinematic Changes Following Slip Perturbations in Subjects with Recurrent Low Back Pain. Ann Biomed Eng 46, 488–497 (2018). https://doi.org/10.1007/s10439-017-1972-8
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DOI: https://doi.org/10.1007/s10439-017-1972-8