Lumbar contribution to the trunk forward bending and backward return; age-related differences

Vazirian, Milad; Shojaei, Iman; Agarwal, Anuj; Bazrgari, Babak

doi:10.1080/00140139.2016.1237676

Cited by 17 publications

(9 citation statements)

References 53 publications

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“…Vazirian et al . 11 studied the differences in the lumbar contribution in four quartiles of forward bending and backward return between five age groups spanning from 20 to 70 years old. The investigators reported a smaller lumbar contribution in the groups older than 50 years, in the males and females, as well as a smaller lumbar contribution in females versus males in all of the quarters of forward bending and backward return.…”

Section: Resultsmentioning

confidence: 99%

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Lumbopelvic rhythm in the sagittal plane: A review of the effects of participants and task characteristics

Vazirian

Dillen

Bazrgari

2016

International Musculoskeletal Medicine

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Objectives Abnormalities of lumbopelvic coordination have been suggested to relate to risk of developing low back pain. The objective of this study is to review and summarize the findings of studies that have implemented and reported on lumbopelvic rhythm during trunk forward bending and backward return. Methods The PUBMED and CINAHL databases were searched for studies related to LPR using appropriate keywords. The references of each study from the database search were further investigated to identify any missed study. Results The findings includes results related to lumbopelvic rhythm, and how it varies due to participant characteristics such as age, gender, and presence of low back pain as well as due to variations in the experimental procedures such as pace of motion, presence of external load, and muscle fatigue. Conclusion In general, the magnitude of lumbar contribution is smaller in people with low back pain, in the elderly and females, as well as with greater pace of motion, but is larger with greater external load or back muscle fatigue. The compiled data in this review are expected to serve as a foundation for implementation of this kinematic-based measure in the conduct of future research.

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Section: Resultsmentioning

confidence: 99%

“…In addition, references of each identified study were also investigated for identification of any study that was missed in the database search. Finally, a recent study by the authors 11 which meets the review inclusion criteria was added to the list of included studies (Fig. 1).…”

Section: Methodsmentioning

confidence: 99%

Lumbopelvic rhythm in the sagittal plane: A review of the effects of participants and task characteristics

Vazirian

Dillen

Bazrgari

2016

International Musculoskeletal Medicine

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“…Data for 19 asymptomatic female controls (aged 40–70 years old) were extracted from an earlier study (Vazirian et al, 2016a). All participants completed an informed consent procedure approved by the University of Kentucky Institutional Review Board before participation.…”

Section: Methodsmentioning

confidence: 99%

“…Age, stature, body mass, and body mass index (BMI) for the two groups were comparable (Table.1). Asymptomatic controls with any history of LBP or musculoskeletal disorders were excluded (Shojaei et al, 2016; Vazirian et al, 2016a). Patients with acute LBP were excluded if they had any significant cognitive impairment, intention to harm themselves or others, or substance abuse.…”

Section: Methodsmentioning

confidence: 99%

“…In asymptomatic individuals, the lumbar contribution to forward bending has been reported to be dominant in the early stage of trunk motion, whereas pelvis contribution increases toward the end of motion and is dominant at the late stage of motion (Esola et al, 1996; Lee and Wong, 2002; Pal et al, 2007; Tafazzol et al, 2014; Vazirian et al, 2016a; Vazirian et al, 2017; Vazirian et al, 2016b). Conversely, backward return starts with a small lumbar contribution that gradually increases toward the end of motion (Granata and Sanford, 2000; Lee and Wong, 2002; McClure et al, 1997; Pal et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Timing and magnitude of lumbar spine contribution to trunk forward bending and backward return in patients with acute low back pain

Shojaei

Vazirian

Salt

et al. 2017

Journal of Biomechanics

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Alterations in the lumbo-pelvic coordination denote changes in neuromuscular control of trunk motion as well as load sharing between passive and active tissues in the lower back. Differences in timing and magnitude aspects of lumbo-pelvic coordination between patients with chronic low back pain (LBP) and asymptomatic individuals have been reported; yet, the literature on lumbo-pelvic coordination in patients with acute LBP is scant. A case-control study was conducted to explore the differences in timing and magnitude aspects of lumbo-pelvic coordination between females with (n=19) and without (n=19) acute LBP. Participants in each group completed one experimental session wherein they performed trunk forward bending and backward return at preferred and fast paces. The amount of lumbar contribution to trunk motion (as the magnitude aspect) as well as the mean absolute relative phase (MARP) and deviation phase (DP) between thoracic and pelvic rotations (as the timing aspect) of lumbo-pelvic coordination were calculated. The lumbar contribution to trunk motion in the 2nd and the 3rd quarters of both forward bending and backward return phases was significantly smaller in the patient than the control group. The MARP and the DP were smaller in the patient vs. the control group during entire motion. The reduced lumbar contribution to trunk motion as well as the more in-phase and less variable lumbo-pelvic coordination in patients with acute LBP compared to the asymptomatic controls is likely the result of a neuromuscular adaptation to reduce painful deformation and to protect injured lower back tissues.

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Activity of Erector Spinae During Trunk Forward Bending and Backward Return: The Effects of Age

Shojaei

Bazrgari

2017

Ann Biomed Eng

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Electromyography (EMG)-based measures of the trunk muscles behavior have been used for objective assessment of biomechanical impairments in patients with low back pain (LBP); yet the literature on normal age-related differences in such measures is scant. A cross-sectional study was designed to assess age-related differences in activity of trunk extensors during forward bending and backward return. Sixty asymptomatic individuals were recruited to form five gender-balanced age groups between 20 and 70 years old. Participants completed two sets of trunk forward bending and backward return task using self-selected and fast motion paces. For bending and return phases of each task, the normalized lumbar flexion angles corresponding to different event times of erector spinae activity along with the peak normalized and non-normalized EMG activities of erector spinae were calculated. The mean normalized and non-normalized EMG activities of erector spinae during the entire task also were calculated. There was no age-related difference in normalized lumbar flexion angles corresponding to different event times of erector spinae activity. However, the peak normalized EMG activity during forward bending and backward return as well as the mean normalized EMG activity during the entire task were found to be larger in older vs. younger individuals. Given the suggested unreliability of normalized EMG in elders and considering that we did not find any age-related differences in non-normalized EMG activity of erector spinae, our results do not strongly support the existence of normal age-related differences in EMG profile of erector spinae during forward bending and backward return. Therefore, when interpreting EMG-based measures of trunk muscles behavior for identification of biomechanical impairment in patients with LBP, potential abnormalities in EMG activity of trunk muscles may not be attributed to patient's age.

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Lumbar contribution to the trunk forward bending and backward return; age-related differences

Cited by 17 publications

References 53 publications

Lumbopelvic rhythm in the sagittal plane: A review of the effects of participants and task characteristics

Lumbopelvic rhythm in the sagittal plane: A review of the effects of participants and task characteristics

Timing and magnitude of lumbar spine contribution to trunk forward bending and backward return in patients with acute low back pain

Activity of Erector Spinae During Trunk Forward Bending and Backward Return: The Effects of Age

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