Abstract

The present study addresses the need to adapt physical fitness assessments for individuals with Down syndrome (DS) by incorporating complementary elements into the standard Mile Test (1609 m) protocol. The aim was to analyze the impact of these adaptations on heart rate (HR) and execution time during test performance. A quasi-experimental design with short-term repeated measures (over two weeks) was employed to evaluate the effects of these protocol modifications on HR and completion time in a sample of 60 participants (35 males and 25 females) with DS, aged 10 to 26 years, enrolled in special education centers in the commune of Talca. Participants were selected through non-probabilistic convenience sampling. Pre-test and post-test assessments were conducted, applying adjustments to the traditional Rockport Test protocol. The main findings showed a significant improvement in performance with each test repetition, as well as a significant increase in heart rate at the 10- and 15-minute marks. The results demonstrate the effectiveness of these modifications—including a familiar setting, small group testing, instructor accompaniment, and prior familiarization—in enhancing the functional response of individuals with DS, as evidenced by improved execution times and more consistent heart rate patterns