Evaluation of motorcyclist's discomfort during prolonged riding process with and without lumbar support.

OBJECTIVE The primary aim of this study is to examine the effects of a backrest: using a prototype of a lumbar support presented in author's earlier study on the discomfort rating of the body parts of motorcyclist. METHODS One hundred motorcyclists participated in this study, all in good physical condition and with no immediate complaint of musculoskeletal disorders. Each participant was asked to sit for 2 hours on a motorcycle in two different sessions (with and without the lumbar support) in a controlled room environment. At every 15 minutes interval the participants were required to rate their discomfort level on the Borg's CR-10 questionnaire. RESULTS The rate of discomfort level (in all body parts) decreased over time during the testing period with the prototype. In terms of the discomfort 'break point', participants identified low back and upper back as the most affected body parts prior to comfort changes during the testing period with the use of the prototype. CONCLUSIONS The use of this prototype provides a protective mechanism for the motorcyclist's musculoskeletal system, particularly the spinal column. Therefore, this prototype is capable of providing ideal posture while simultaneously enhancing the comfortability of the motorcyclist during the riding process (by reducing discomfort).

[1]  N Yamazaki.  Analysis of sitting comfortability of driver's seat by contact shape. , 1992, Ergonomics.

[2]  Peter J Keir,et al.  Effects of backrest design on biomechanics and comfort during seated work. , 2007, Applied ergonomics.

[3]  P. Dolan,et al.  Commonly Adopted Postures and Their Effect on the Lumbar Spine , 1988, Spine.

[4]  K. Berkley,et al.  Pain: Sex/Gender Differences , 2002 .

[5]  R. Fillingim,et al.  Sex, gender, and pain: a review of recent clinical and experimental findings. , 2009, The journal of pain : official journal of the American Pain Society.

[6]  Mohd Jailani Mohd Nor,et al.  Evaluation of Car Seat Using Reliable and Valid Vehicle Seat Discomfort Survey , 2009 .

[7]  Clare Lowe,et al.  Road Safety Research Report No. 123: Road User Safety and Disadvantage , 2011 .

[8]  R Ortengren,et al.  Lumbar disc pressure and myoelectric back muscle activity during sitting. IV. Studies on a car driver's seat. , 1974, Scandinavian journal of rehabilitation medicine.

[9]  D E Gyi,et al.  Musculoskeletal problems and driving in police officers. , 1998, Occupational medicine.

[10]  M Lusted,et al.  Evaluation of the seating of Qantas flight deck crew. , 1994, Applied ergonomics.

[11]  D. Harrison,et al.  Sitting biomechanics part I: review of the literature. , 1999, Journal of manipulative and physiological therapeutics.

[12]  E. Gdoutos,et al.  A critical review of the biomechanical stress analysis of the human femur. , 1982, Biomaterials.

[13]  M G Helander,et al.  Field studies of comfort and discomfort in sitting. , 1997, Ergonomics.

[14]  Virendra Tewari,et al.  Seating discomfort for tractor operators – a critical review , 2000 .

[15]  De Carvalho,et al.  TIME VARYING GENDER AND PASSIVE TISSUE RESPONSES TO PROLONGED DRIVING , 2008 .

[16]  S. McGill,et al.  Low back joint loading and kinematics during standing and unsupported sitting , 2001, Ergonomics.

[17]  Gregory J Lehman,et al.  Biomechanical assessments of lumbar spinal function. How low back pain sufferers differ from normals. Implications for outcome measures research. Part I: kinematic assessments of lumbar function. , 2004, Journal of manipulative and physiological therapeutics.

[18]  Ramaratnam R Bishu,et al.  Seating comfort and its relationship to spinal profile: A pilot study , 1991 .

[19]  W. Maixner,et al.  Sex differences in temporal summation but not sensory-discriminative processing of thermal pain , 1998, Pain.

[20]  E N Corlett,et al.  How does a backrest work? , 1984, Applied ergonomics.

[21]  Y. Ishige,et al.  Effectiveness of a Lumbar Support Continuous Passive Motion Device in the Prevention of Low Back Pain During Prolonged Sitting , 2007, Spine.

[22]  H. Mori,et al.  The effect of massage on localized lumbar muscle fatigue , 2002, BMC complementary and alternative medicine.

[23]  E. Heath.  Borg's Perceived Exertion and Pain Scales , 1998 .

[24]  Seokhee Na,et al.  Evaluation of driver's discomfort and postural change using dynamic body pressure distribution , 2005 .

[25]  J. J. Keegan,et al.  Alterations of the lumbar curve related to posture and seating. , 1953, The Journal of bone and joint surgery. American volume.

[26]  Karen J. Berkley,et al.  PainSex/Gender Differences , 2002 .

[27]  F.En E. N. Corlett.  The Ergonomics Society The Society's Lecture 1989 ASPECTS OF THE EVALUATION OF INDUSTRIAL SEATING , 1989 .

[28]  Saeid Motavalli,et al.  Measurement of seating comfort , 1993 .

[29]  Napsiah Ismail,et al.  Conceptual design and prototype of an ergonomic back-leaning posture support for motorbike riders , 2008 .

[30]  Waldemar Karwowski,et al.  Low back symptoms among hospital nurses, associations to individual factors and pain in multiple body regions , 2010 .

[31]  D E Gyi,et al.  Interface pressure and the prediction of car seat discomfort. , 1999, Applied ergonomics.

[32]  T. Katsuura,et al.  Effects of strap support in a hand-held device on the muscular activity in female workers assessed by electromyography and subjective rating , 2009, Ergonomics.

[33]  Paul Kinnear,et al.  SPSS 14 Made Simple , 2000 .

[34]  Edward Martin Stevens,et al.  Design guidelines and evaluation of an ergonomic chair feature capable of providing support to forward-leaning postures , 2005 .

[35]  M. Graf,et al.  An assessment of seated activity and postures at five workplaces , 1995 .

[36]  E N Corlett,et al.  Background to sitting at work: research-based requirements for the design of work seats , 2006, Ergonomics.

[37]  Jacques Duchêne,et al.  Evaluation of driver discomfort during long-duration car driving. , 2003, Applied ergonomics.

[38]  Serge H. Roy,et al.  Lumbar Muscle Fatigue and Chronic Lower Back Pain , 1989, Spine.

[39]  Napsiah Ismail,et al.  A study on motorcyclist's riding discomfort in Malaysia , 2009 .

[40]  R. S. Bridger,et al.  Some fundamental aspects of posture related to ergonomics , 1991 .

[41]  L. Naing,et al.  Practical Issues in Calculating the Sample Size for Prevalence Studies , 2006 .

[42]  A. Aloisi.  Sex differences in pain-induced effects on the septo-hippocampal system , 1997, Brain Research Reviews.

[43]  Narelle L. Haworth,et al.  Fatigue in motorcycle crashes: is there an issue? , 2006 .

[44]  Ravindra S. Goonetilleke,et al.  A methodology to determine the optimum seat depth , 2001 .

[45]  F. Št̆astný.  Hydrocortisone as a possible inductor of Na + -K + -ATPase in the chick embryo cerebral hemispheres. Effect of metopirone. , 1971, Physiologia Bohemoslovaca.

[46]  Jacob Cohen.  Statistical Power Analysis for the Behavioral Sciences , 1969, The SAGE Encyclopedia of Research Design.

[47]  S Lings,et al.  Is sitting-while-at-work associated with low back pain? A systematic, critical literature review. , 2000, Scandinavian journal of public health.

[48]  G. Elfström,et al.  Intravital dynamic pressure measurements in lumbar discs. A study of common movements, maneuvers and exercises. , 1970, Scandinavian journal of rehabilitation medicine. Supplement.

[49]  Leslie London,et al.  A cross-sectional study of back belt use and low back pain amongst forklift drivers , 2007 .

[50]  Venkatesh Balasubramanian,et al.  Surface EMG based muscle activity analysis for aerobic cyclist. , 2009, Journal of bodywork and movement therapies.