Characteristics of hypotonia in children: a consensus opinion of pediatric occupational and physical therapists.
OBJECTIVE
The term hypotonia is often used to describe children with reduced muscle tone, yet it remains abstract and undefined. The purpose of this study was to identify characteristics of children with hypotonia to begin the process of developing an operational definition of hypotonia.


METHODS
Three hundred physical and occupational therapists were systematically selected from the memberships of the Pediatric Section of the American Physical Therapy Association and the Developmental Delay Section of the American Occupational Therapy Association and asked to complete an open-ended survey exploring characteristics of strength, endurance, mobility, posture, and flexibility.


RESULTS
The response rate was 26.6%. Forty-six physical therapists and 34 occupational therapists participated. The criterion for consensus about a characteristic was being mentioned by at least 25% of respondents from each discipline. The consensus was that children with hypotonia have decreased strength, decreased activity tolerance, delayed motor skills development, rounded shoulder posture, with leaning onto supports, hypermobile joints, increased flexibility, and poor attention and motivation.


CONCLUSIONS
An objective tool for defining and quantifying hypotonia does not exist. A preliminary characterization of children with hypotonia was established, but further research is needed to achieve objectivity and clarity.
Martin
Kathy
K
Krannert School of Physical Therapy University of Indianapolis, Indianapolis, IN 46227, USA. kmartin@uindy.edu
Inman
Jill
J
Kirschner
Abby
A
Deming
Katie
K
Gumbel
Rachel
R
Voelker
Lindsey
L
D002648:Child; D032921:Consensus; D003625:Data Collection; D003937:Diagnosis, Differential; D006801:Humans; D009123:Muscle Hypotonia / Q000145:classification / Q000175:diagnosis*; D009788:Occupational Therapy; D026761:Physical Therapy Specialty