AngelopoulouN., MatziariC., TsimarasV., SakadamisA., SouftasV., & MandroukasK. (2000). Bone mineral density and muscle strength in young men with mental retardation (with and without Down syndrome). Calcified Tissue International, 66, 176–180.
2.
CaouetteM., & ReidG. (1991). Influence of auditory stimulation on the physical work output of adults who are severely retarded. Education and Training in Mental Retardation, 26, 43–52.
3.
CarrJ. E., DozierC. L., PatelM. R., AdamsA., & MartinN. (2002). Treatment of automatically reinforced object mouthing with noncontingent reinforcement and response blocking: Experimental analysis and social validation. Research in Developmental Disabilities, 23, 37–44.
4.
CenterI, BeangeH., & McElduffA. (1998). People with mental retardation have an increased prevalence of osteoporosis: A population study. American Journal on Mental Retardation, 103, 19–28.
5.
CrawfordM. R., & SchusterJ. W. (1993). Using microswitches to teach toy use. Journal of Developmental and Physical Disabilities, 5, 349–368.
6.
FavellJ. A., RealonR. E., & SuttonK. A. (1996). Measuring and increasing the happiness of people with profound mental retardation and physical handicaps. Behavioral Interventions, 11, 47–58.
7.
FischerS. M., IwataB. A., & MazaleskiJ. L. (1997). Noncontingent delivery of arbitrary reinforcers as treatment for self-injurious behavior. Journal of Applied Behavior Analysis, 30, 239–249.
8.
GreenC. W., & ReidD. H. (1999). A behavioral approach to identifying sources of happiness and unhappiness among individuals with profound multiple disabilities. Behavior Modification, 23, 280–293.
9.
LancioniG. E., GiganteA., O'ReillyM. F., OlivaD., & MontironiL. (2000). Indoor travel and simple tasks as physical exercise for people with profound multiple disabilities. Perceptual and Motor Skills, 91, 211–216.
10.
LancioniG. E., & O'ReillyM. F. (1998). A review of research on physical exercise with people with severe and profound developmental disabilities. Research in Developmental Disabilities, 19, 477–492.
11.
LancioniG. E., SinghN. N., O'ReillyM. F., OlivaD., CampodonicoF., & GroenewegJ. (in press). Use of simple exercise tools by students with multiple disabilities: Impact of automatically-delivered stimulation on activity level and mood. Journal of Developmental and Physical Disabilities.
12.
MiltenbergerR. (1997). Behavior modification: Principles and procedures.Pacific Grove, CA: Brooks/Cole.
13.
SiegelS., & CastellanN. J. (1988). Nonparametric statistics (2nd ed.). New York: McGraw-Hill.
14.
WagemansA. M., FioletJ. F., van der LindenE. S., & MenheereP. P. (1998). Osteoporosis and intellectual disability: Is there any relation?Journal of Intellectual Disability Research, 42, 370–374.
15.
WilderD. A., FisherW. W., AndersB. M., CerconeJ. J., & NeidertP. L. (2001). Operative mechanisms of noncontingent reinforcement at various magnitudes and schedules. Research in Developmental Disabilities, 22, 117–124.
16.
YuD. C. T., SpevackS., HiebertR., MartinT. L., GoodmanR., MartinT. G., HarapiakS., & MartinG. L. (2002). Happiness indices among persons with profound and severe disabilities during leisure and work activities: A comparison. Education and Training in Mental Retardation and Developmental Disabilities, 37, 421–426.