Aims: To establish isometric muscle strength reference values for trunk flexors, trunk extensors, trunk ateral flexors and trunk rotators by using a hand held dynamometer in 6 to 12 years of age children. Methodology: In thiscross-sectional study a total number of 280 children in the age group of 6 to 12 years, with 140 from each gender, were recruited for measuring the trunk muscle strength values using a baseline hand-held dynamometer. Major findings:The reference values of the trunk flexors, trunk extensors, trunk lateral flexors and trunk rotators were established. It was observed that the height and weight of the children proportionately increased from 6 to 12 years with a few exceptions between 10-12 years in both boys and girls. Conclusion: The normal mean value of isometric trunk muscle strength using a hand held dynamometer ranged from 23.53N to 137.58N, in children 6 to 12 years of age. In girls it ranged from 23.53N to 121.03N whereas in boys from 41.40N to 137.58N.

Keywords: Normatie data; Typically developing; Muscle power; Pediatric population; Dynamometer.