Biomechanical analyses of prolonged handwriting in subjects with and without perceived discomfort.

Since wrist-joint position affects finger muscle length and grip strength, we studied its biomechanical relevance in prolonged handwriting. We recruited participants from young adults, aged 18-24, and separated them into control (n=22) and in-pain (n=18) groups, based whether or not they experience pain while handwriting. The participants then performed a writing task for 30 min on a computerized system which measured their wrist-joint angle and documented their handwriting kinematics. The in-pain group perceived more soreness and had a less-extended wrist joint, longer on-paper time, and slower stroke velocity compared to control group. There was no significant difference in handwriting speed and quality between the two groups. The wrist extension angle significantly correlated with perceived soreness. Ergonomic and biomechanical analyses provide important information about the handwriting process. Knowledge of pen tip movement kinematics and wrist-joint position can help occupational therapists plan treatment for individuals with handwriting induced pain.

[1]  Hans-Leo Teulings,et al.  A DESCRIPTION OF HANDWRITING IN TERMS OF MAIN AXES , 1989 .

[2]  Lambert Schomaker,et al.  Neuromotor noise and poor handwriting in children. , 1993, Acta psychologica.

[3]  Calligraphy and meditation for stress reduction: an experimental comparison , 2014, Psychology research and behavior management.

[4]  Joanne Phelps,et al.  The Children's Handwriting Scale: A New Diagnostic Tool , 1985 .

[5]  B. Smits-Engelsman,et al.  Fine motor deficiencies in children diagnosed as DCD based on poor grapho-motor ability. , 2001, Human movement science.

[6]  Shao-Hsia Chang,et al.  Effects of the wrist angle on the performance and perceived discomfort in a long lasting handwriting task , 2011, 2011 4th International Conference on Biomedical Engineering and Informatics (BMEI).

[7]  K. J. Cole,et al.  Wrist action affects precision grip force. , 1997, Journal of neurophysiology.

[8]  Catherine McBride-Chang,et al.  Writing quality in Chinese children: speed and fluency matter , 2012, Reading and writing.

[9]  T D Cahalan,et al.  The relationship between wrist position, grasp size, and grip strength. , 1992, The Journal of hand surgery.

[10]  Cynthia S. Puranik,et al.  Modeling the development of written language , 2011, Reading and writing.

[11]  Stephen T. Peverly,et al.  The Importance of Handwriting Speed in Adult Writing , 2006, Developmental neuropsychology.

[12]  F Yoshinaga,et al.  An electromyographic study of two different types of ballpoint pens--investigation of a one hour writing operation. , 2000, Industrial health.

[13]  Luis Alberto Magna,et al.  An electromyographic analysis of two handwriting grasp patterns. , 2013, Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology.

[14]  Carol A. Christensen,et al.  Relationship between automaticity in handwriting and students' ability to generate written text , 1999 .

[15]  S. Parush,et al.  Ergonomic factors influencing handwriting performance. , 1998, Work.

[16]  J. Summers,et al.  Assessment of handwriting speed and factors influencing written output of university students in examinations , 2003 .

[17]  Sara Rosenblum,et al.  Computerized temporal handwriting characteristics of proficient and non-proficient handwriters. , 2003, The American journal of occupational therapy : official publication of the American Occupational Therapy Association.

[18]  Arend W A Van Gemmert,et al.  Forearm EMG response activity during motor performance in individuals prone to increased stress reactivity. , 2002, American journal of industrial medicine.

[19]  S. Campbell,et al.  Contribution of Lower Order Skills to the Written Composition of College Students With and Without Dyslexia , 2006, Developmental neuropsychology.

[20]  J. Ziviani,et al.  Writing speed and legibility of 7–14-year-old school students using modern cursive script , 2010 .

[21]  Lisa A. Kurtz.  Helpful Handwriting Hints , 1994 .

[22]  P. A. Houglum,et al.  Brunnstrom's Clinical kinesiology , 1983 .

[23]  M. Hallett,et al.  Modulation of electromyographic activity of wrist flexor and extensor muscles in patients with writer's cramp , 1995, Movement disorders : official journal of the Movement Disorder Society.

[24]  Shao-Hsia Chang,et al.  The effect of computer-assisted therapeutic practice for children with handwriting deficit: a comparison with the effect of the traditional sensorimotor approach. , 2014, Research in developmental disabilities.

[25]  M. Katz-Leurer,et al.  Analysis of proximal and distal muscle activity during handwriting tasks. , 2007, The American journal of occupational therapy : official publication of the American Occupational Therapy Association.