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Weighted Vests Vs. Standard Occupational Therapy on
On-Task Behavior in Children with Autism Spectrum Disorders
Brittney Schorr, MOTS
Agenda
• Background• Objective• Intervention• Methodological Quality of Studies• Results• Discussion• Implications for OT Practitioners• Implications for Future Research
BACKGROUND
photo: medicmagic.net
On-Task Behavior
photo: whatafy.com
Sensory Integration
• Regulates behavior through sensory systems:– Tactile – Proprioceptive– Vestibular
• SI treatments:– weighted vests– pressured vests– weighted blankets
Weighted Vests
• Commonly cloth vests with pockets in the front and back
• Weights in the pockets
• Weights can be made of any material
Occupational Therapy Treatment as Usual
• Includes:– Music Therapy– Therapy Ball Chairs– Picture Activity Schedules– Hug Machine
Picture Activity Schedule
Hug Machine
Objective
• To examine the extent to which the research literature supports weighted vests as compared to treatment as usual as a more effective approach to improving on-task behavior in children with ASD
Search Terms
• Autism• Weighted vest• Therapy• On-task behavior• Attention• Developmental Disorder
Types of Studies
• Controlled Clinical Trials
• Mixed Study Designs
• Experimental Research
• Single Subject
Participants• Children with:
– ASD– Attention deficit hyperactive disorders (ADHD)– Developmental delays
• 2 to 13 years old
• 45 boys, 11 girls (56 total)
Diagnoses & Interventions
4 Autism and PDD
Fertel-Daly et al., 2001
Hodgetts et al., 2010
Kane et al., 2005
Leew et al., 2009
1 ADHDVandenBerg, 2001
1 Developmental DelaysReichow et al., 2009
Weighted Vest
Diagnoses & Interventions
1 Music Therapy
Kim et al., 2008
1 Picture Activity Schedules
Bryan & Gast, 2000
1 Hug Machine
Edelson, et al., 1998
1 Therapy Ball Chairs
Bagatell et al., 2010
Therapy as Usual (all children with autism)
Inclusion Criteria
• Confirmed physician diagnosis• Between 2 and 13 years old• Korean Childhood Autism Rating Scale• Problematic behaviors interfering with
ADLs• 65 or above on Conners’ Teacher Rating
Scale
Exclusion Criteria
• Diagnoses not confirmed by physicians
• Over 13 and younger than 2 years old
• Current therapy (OT, PT, SLP) in 9
studies
• Co-morbid diagnoses
Sample Sizes
• Range: 1 child to 12 children
• Average: 6 children per study
Weighted Vest Intervention: ABA Withdrawal Design
• Initial baseline phases (A)– Classroom fine-motor activity
• Intervention phases (B)– Classroom fine-motor activity– 2 studies: Vests worn six 20-30 minute sessions– 1 study: Vests worn 2 hrs. per day, 3x/wk for 12 wks– 1 study: Vests worn 45 minutes during 14 sessions
• Withdrawal phases (A)– Classroom fine-motor activity– Removal of vests
Weighted Vest Intervention:ABC Withdrawal Design
• Baseline phase (A):– Classroom fine-motor activity
• Experimental phase (B):– Vests worn without weight 20-30 mins./day
for 2 wks
• Experimental phase (C):– Vests worn with weight 20-30 mins./day for 2
wks
Treatment as Usual: Hug Machine
• Two 20 min. sessions/wk. for 6 wks.
• Experimental group: – Lie in Hug Machine – Lever provided deep pressure
• Control group:– Lie in the Hug Machine – Lever disengaged
Treatment as Usual: Therapy Ball Chairs
• Baseline phase:– 15 minute classroom “Circle Time” – No therapy ball chairs
• Intervention phase: – Utilized therapy ball chairs during “Circle Time”
Treatment as Usual:Picture Activity Schedules
• Baseline phase:– Classroom activity 45 mins./day for 5 days– No picture activity schedule
• Intervention phase:– Picture activity books– 4 step activity
Treatment as Usual: Music Therapy
• Baseline phase:– Observed engagement during normal play – 30 mins./day for 12 weeks
• Intervention phase:– Observed during normal play incorporating music– 30 mins./day for 12 weeks
Outcome Measures
• Data sheets (10 studies)
• Data collection:– Videotaped recordings – Researcher observations– Conner’s Parent Rating Scale– Parenting Morale Index– Pre-tests and post-tests
• Pervasive Developmental Disorder Behavior Inventory-C
Data Analysis
• MANOVA
• Repeated measures ANOVA
• 2-standard deviation
• Celeration line approach – Predicted an increase or decrease in on-task
behavior
Methodological Quality of Studies
• Natural environments– Classroom – Home
• Randomization in 5 studies
• Blinding in 5 studies
Controlling for Threats to Validity• Same diagnoses
• Did not include scores of 3 children who dropped out
• Served as own control
• Inter-rater reliability
• Controlled for maturation by conducting the studies within weeks
Limitations• Small number of participants
• Only male participants in four studies
• Only one facility when recruiting participants
• Unequal groups in 4 studies:
– Group numbers
– 1 child had previous experiences with weighted vests
– Experimental group rated higher on the Tension and
Anxiety Scale than control group
Limitations• Poorly defined procedures:
– Did not state the frequency, duration, or intensity of OT
• Undisclosed treatment environment
• No means of controlling environmental distractions– Disruptive classmates – Loud noises
• No randomization in group assignments in 5 studies
Limitations
• No experimenter blinding in 5 studies
• No psychometric properties of tests were disclosed in 5 studies
• Hawthorne effect – Children knew they were being observed
Results: Treatment as Usual• Hug Machine:
– Experimental group lower tension levels on the Tension Scale than control group • t(10)= 3.124, p<.05
– Lower on Anxiety Scale than the control group • t(10)=1.959, p<10
• Therapy Ball Chairs:– Positive effects during “Circle Time”– Decreased number of minutes spent out of chair– No p values given
Results: Treatment as Usual
• Picture Activity Schedule: – Children remained on-task and on-schedule
when using the books– No p values given
• Music therapy:– Increased eye contact (p<0.0001). – Medium effect on on-task behavior (d=.63)
Results: Weighted Vests
• ADHD:– Significant change (p<.05) from baseline to
intervention– Increase in on-task behavior (18% - 25%)
• Developmental Delays:– No improvement in on-task behavior– Greater incidences of problematic behavior– No p values
Results: Weighted Vests
• PDD:– 1st study
• Decrease in number of distractions • Increase in focused attention• No p values
– 2nd study (PDD & autism)• No increase in on-task behavior• No p values
Results: Weighted Vests • Autism:
– 1st study• No overall improvement in on-task behavior• Slight increase in on-task behavior in one child, but not
maintained• No p values
– 2nd study• No increase in on-task behavior• No p values
Discussion
• Evidence suggests that weighted vests are not a more effective intervention than OT as usual for increasing on-task behavior in children with Developmental Delays and ASD (autism, PDD)
Discussion
• Weighted vests appeared to temporarily improve on-task behavior in one child with PDD– Long term effects not evaluated
– Child received OT throughout the study
– Unable to determine whether the results were contributed to the vests or from OT
Discussion
• Weighted vests appeared to have significant effects on children with ADHD
• Only included 4 children– Convenience sampling recruitment method– Long term effects not evaluated
Discussion• OT as usual is noted to be a more effective
method for promoting on-task behavior in children with ASD
• Therapy ball chairs– Positive effects on in-seat and on-task behavior
• Music therapy – Effective intervention
Discussion
• Hug Machine– Deep pressure can contribute to an increase
in on-task behavior– Extensive measures to control for threats
• Picture activity schedules – Children’s performance increased by 100%
Conclusion
• Efficacy of weighted vests depends on the child and his or her diagnosis
• OT as usual appears to be a more reliable option for improving on-task behavior in children with ASD
Implications for OT Practice
• Weighted vests may provide short-term calming effects on children with ADHD, but long-term effects have not been evaluated
• OTs should not generalize the results to adults and diagnoses outside of the study
• OTs who use weighted vests must proceed with caution until further evidence can be established
Implications for Future Research
• Replicating in other contexts
• Long term effects
• Longer intervention period
• Examining other protocols
• Larger sample sizes
• Boys and girls
• Increasing amounts of weight in vests
References• Bagatell, N., Mirigliani, G., Patterson, C., Reyes, Y., & Test, L. (2010). Effectiveness of therapy ball chairs on classroom participation in
children with autism spectrum disorders. American Journal of Occupational Therapy, 64, 895–903.• Bryan, L., & Gast, D. (2000). Teaching on-task and on-schedule behaviors to high-functioning children with autism via picture activity
schedules. Journal of Autism and Developmental Disorders, 30(6), 553-567.• Edelson, S., Edelson, M., Kerr, D., & Grandin, T. (1999). Behavioral and physiological effects of deep pressure on children with autism:
a pilot study evaluating the efficacy of grandin's hug machine. The American Journal of Occupational Therapy, 53(2), 145-152.• Fertel-Daly, D., Bedell, G., & Hinojosa, J. (2001). Effects of a weighted vest on attention to task and self-stimulatory behaviors in
preschoolers with pervasive developmental disorders. The American Journal of Occupational Therapy, 55(6), 629-640. Retrieved from http://www1.aota.org/ajot/index.asp
• Hodgetts, S., Magill-Evans, J., & Misiaszek, J. (2010). Weighted vests, stereotyped behaviors and arousal in children with autism. Journal of Autism and Developmental Disorders, 41, 805-814.
• Kane, A., Luiselli, J., Dearborn, S., & Young, N. (2004). Wearing a weighted vest as intervention for children with autism/pervasive developmental disorder. The Scientific Review of Mental Health Practice, 3(2), 19-24.
• Kim, J., Wigram, T., & Gold, C. (2008). The effects of improvisational music therapy on joint attention behaviors in autistic children: a randomized controlled study. Journal of Autism and Developmental Disorders, 38, 1758-1766.
• Krebs, M, McDaniel, M, & Neely, R. (2011). The effects of peer training on the social interactions of children with autism spectrum disorders. Education, 131(2), 393-403.
• Leew, S., Stein, N., & Gibbard, B. (2010). Weighted vests' effect on social attention for toddlers with autism spectrum disorders. Canadian Journal of Occupational Therapy, 77(2), 113-124.
• Moss, J, & Howlin, P. (2009). Autism spectrum disorders in genetic syndromes: implications for diagnosis, intervention and understanding the wider autism spectrum disorder population. Journal of Intellectual Disability Research, 53(10), 852-873.
• Reichow, B., Barton, E., Good, L., & Wolery, M. (2009). Brief report: effects of pressure vest usage on engagement and problem behaviors of a young child with developmental delays. Journal of Autism and Developmental Disorder, 39, 1218-1221.
• Sansosti, F. (2010). Teaching social skills to children with autism spectrum disorders using tiers of support: a guide for school-based professionals. Psychology in the Schools, 47(3), 257-278.
• VandenBerg, N. (2001). The use of a weighted vest to increase on-task behavior in children with attention difficulties. The American Journal of Occupational Therapy, 55(6), 621-628. Retrieved from http://www1.aota.org/ajot/index.asp
• Watling, R. L., & Dietz, J. (2007). Immediate effect of Ayres’s sensory integration–based occupational therapy intervention on children with autism spectrum disorders. American Journal of Occupational Therapy, 61, 574–583.
Thank You!