Variations in cognitive demand affect heart rate in typically developing children and children at risk for developmental coordination disorder.
Kids at risk for DCD show flatter heart-rate variability when task difficulty jumps—consider physiological monitoring during assessments.
01Research in Context
What this study did
Researchers watched heart-rate variability in two groups of kids. One group was at risk for developmental coordination disorder. The other group was typically developing.
Kids played easy and hard computer picture games while a monitor tracked tiny beat-to-beat changes. The team wanted to see if heart-rate patterns changed when the game got tougher.
What they found
Typically developing kids showed bigger heart-rate swings between easy and hard games. Kids at risk for DCD had flatter, smaller swings.
The flat response hints that their autonomic system reacts less to rising mental load.
How this fits with other research
Krajenbrink et al. (2023) used a similar setup and also saw no performance gap, but kids with DCD said the tasks felt harder. Together the papers show the body stays calm while the mind feels strained.
Cavalcante Neto et al. (2026) later proved this marker can move. After eight weeks of Wii-training, children with DCD produced the bigger heart-rate variability the target paper said was missing.
Zamunér et al. (2011) saw the same flat pattern in kids with cerebral palsy years earlier. The target study widened the finding to the milder DCD risk group.
Why it matters
You now have a quick, non-invasive clue during assessments. If a child's heart-rate variability barely moves as tasks get harder, suspect dampened autonomic regulation and plan shorter, well-paced sessions. Track this signal again after movement or exergame programs to show physiological gains, not just motor gains.
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02At a glance
03Original abstract
BACKGROUND: Developmental coordination disorder (DCD) is a diagnosis for children who present with movement difficulties, but are of normal intelligence without neurological deficits. Previous studies have demonstrated that children with DCD exhibit perceptual deficits and lower cognition performance. To date, their autonomic nervous system (ANS) responses during tasks requiring cognitive and perceptual effort have not been compared to typically developing children (TDC). OBJECTIVE: The present study investigated heart rate variability (HRV) as a marker for ANS response differences between DCD and TDC, and the impact of different levels of task difficulty. METHODS: Participants were 60 individuals (9-10 years); 30 children at risk for DCD, and 30 TDC. Each participant performed two tasks each of which demanded enhanced cognitive effort: a visual signal detection task and a digit memory task-each task had two levels of difficulty, low (LD) and high (HD). Heart rate responses were continuously recorded during performance of each task. Frequency domain analysis and heart rate sample entropy (SampEn) were computed to determine ANS responses in each of the tasks. RESULTS: HRV differences were detected between the two levels of task difficulty, LD and HD, for the visual signal detection task, but not for the digit memory task. HRV differences between LD and HD conditions were greater for TDC children than DCD when engaged in visual signal detection task, compare to the memory task. INTERPRETATION: The results suggest that children at risk for DCD may show decreased HRV as a marker for altered ANS responses and potential deficits in the linkage between their perceptions and actions.
Research in developmental disabilities, 2015 · doi:10.1016/j.ridd.2014.12.002