Age related differences in mechanical demands imposed on the lower back by manual material handling tasks.

The prevalence of low back pain (LBP) increases with age, yet the underlying mechanism(s) responsible for this remains unclear. To explore the role of biomechanical factors, we investigated age-related differences in lower-back biomechanics during sagittally-symmetric simulated manual material handling tasks. For each task, trunk kinematics and mechanical demand on the lower back were examined, from among 60 participants within five equal-sized and gender-balanced age groups spanning from 20 to 70 years old. The tasks involved lowering a 4.5 kg load from an upright standing posture to both knee height and a fixed height and then lifting the load back to the initial upright posture. During these tasks, segmental body kinematics and ground reaction forces were collected using wireless inertial measurement units and a force platform. Overall, older participants completed the tasks with larger pelvic rotation and smaller lumbar flexion. Such adopted trunk kinematics resulted in larger peak shearing demand at the lower back in older vs. younger participants. These results suggest that older individuals may be at a higher risk for developing lower back pain when completing similar manual material handling tasks, consistent with epidemiological evidence for higher risks of occupational low back pain among this cohort.

[1]  K P Granata,et al.  Lumbar-pelvic coordination is influenced by lifting task parameters. , 2000, Spine.

[2]  Babak Bazrgari,et al.  Analysis of squat and stoop dynamic liftings: muscle forces and internal spinal loads , 2007, European Spine Journal.

[3]  W. G. Allread,et al.  The Role of Dynamic Three-Dimensional Trunk Motion in Occupationally-Related Low Back Disorders: The Effects of Workplace Factors, Trunk Position, and Trunk Motion Characteristics on Risk of Injury , 1993, Spine.

[4]  Seonhong Hwang,et al.  Comparison of Lumbopelvic Rhythm and Flexion-Relaxation Response Between 2 Different Low Back Pain Subtypes , 2013, Spine.

[5]  Wafa Skalli,et al.  Gravity Line Analysis in Adult Volunteers: Age-Related Correlation With Spinal Parameters, Pelvic Parameters, and Foot Position , 2006, Spine.

[6]  Lars Arendt-Nielsen,et al.  The influence of low back pain on muscle activity and coordination during gait: a clinical and experimental study , 1996, Pain.

[7]  W S Marras,et al.  Spine loading during asymmetric lifting using one versus two hands. , 1998, Ergonomics.

[8]  S. Siegler,et al.  Analysis of Lumbar Spine and Hip Motion During Forward Bending in Subjects With and Without a History of Low Back Pain , 1996, Spine.

[9]  P DeVita,et al.  Effects of asymmetric load carrying on the biomechanics of walking. , 1991, Journal of biomechanics.

[10]  L. Manchikanti.  Epidemiology of low back pain. , 2000, Pain physician.

[11]  I. Kingma,et al.  Validation of a full body 3-D dynamic linked segment model , 1996 .

[12]  J. Johnston,et al.  The prevalence of chronic pain in United States adults: results of an Internet-based survey. , 2010, The journal of pain : official journal of the American Pain Society.

[13]  Aboulfazl Shirazi-Adl,et al.  Biomechanics of Changes in Lumbar Posture in Static Lifting , 2005, Spine.

[14]  R. Hyatt,et al.  Association of muscle strength with functional status of elderly people. , 1990, Age and ageing.

[15]  Xingda Qu,et al.  Age-related biomechanical differences during asymmetric lifting , 2014 .

[16]  D B Chaffin,et al.  A dynamic biomechanical evaluation of lifting maximum acceptable loads. , 1984, Journal of biomechanics.

[17]  M. Adams.  The Biomechanics of Back Pain , 2002 .

[18]  D K Ahern,et al.  Reliability of lumbar paravertebral EMG assessment in chronic low back pain. , 1986, Archives of physical medicine and rehabilitation.

[19]  G. Mawston,et al.  Age-related differences do affect postural kinematics and joint kinetics during repetitive lifting. , 2015, Clinical biomechanics.

[20]  P. Rochon,et al.  The prevalence of low back pain in the elderly. A systematic review of the literature. , 1999, Spine.

[21]  David A. Winter,et al.  Biomechanics and Motor Control of Human Movement , 1990 .

[22]  M. Parnianpour,et al.  Lumbopelvic rhythm during forward and backward sagittal trunk rotations: combined in vivo measurement with inertial tracking device and biomechanical modeling. , 2014, Clinical biomechanics.

[23]  A. Plamondon,et al.  Validation of two 3-D segment models to calculate the net reaction forces and moments at the L(5)/S(1) joint in lifting. , 1996, Clinical biomechanics.

[24]  R. Riemer,et al.  Uncertainties in inverse dynamics solutions: a comprehensive analysis and an application to gait. , 2008, Gait & posture.

[25]  F. Blyth,et al.  The Epidemiology of low back pain. , 2010, Best practice & research. Clinical rheumatology.

[26]  J. Mac-Thiong,et al.  Age- and sex-related variations in sagittal sacropelvic morphology and balance in asymptomatic adults , 2011, European Spine Journal.

[27]  Xingda Qu,et al.  Effects of age and its interaction with task parameters on lifting biomechanics , 2014, Ergonomics.

[28]  Brad D Hendershot,et al.  Three-dimensional joint reaction forces and moments at the low back during over-ground walking in persons with unilateral lower-extremity amputation. , 2014, Clinical biomechanics.

[29]  A. Garg,et al.  Epidemiology of low-back pain in industry. , 1992, Occupational medicine.

[30]  Gwanseob Shin,et al.  Differences in Trunk Kinematics and Ground Reaction Forces Between Older and Younger Adults during Lifting , 2005 .

[31]  T. Andriacchi,et al.  Influence of Dynamic Factors and External Loads on the Moment at the Lumbar Spine in Lifting , 1988, Spine.

[32]  W. Marras.  Occupational low back disorder causation and control , 2000, Ergonomics.

[33]  Stephan Milosavljevic,et al.  The effect of age on lumbar range of motion: a systematic review. , 2009, Manual therapy.

[34]  A Plamondon,et al.  A comparative study of two trunk biomechanical models under symmetric and asymmetric loadings. , 2010, Journal of biomechanics.

[35]  J M Brown,et al.  Neuromuscular control of lifting in the elderly. , 1994, Gerontology.

[36]  Corinne Peek-Asa,et al.  Incidence of Acute Low-Back Injury Among Older Workers in a Cohort of Material Handlers , 2004, Journal of occupational and environmental hygiene.

[37]  Antonie J van den Bogert,et al.  Effect of low pass filtering on joint moments from inverse dynamics: implications for injury prevention. , 2012, Journal of biomechanics.

[38]  J. Katz,et al.  Lumbar disc disorders and low-back pain: socioeconomic factors and consequences. , 2006, The Journal of bone and joint surgery. American volume.

[39]  L P Steenbekkers,et al.  The composition of a graph on the decline of total body strength with age based on pushing, pulling, twisting and gripping force. , 2001, Applied ergonomics.

[40]  F. Blyth,et al.  Placing the global burden of low back pain in context. , 2013, Best practice & research. Clinical rheumatology.