Individual heart rate assessment and bout analysis of vigorous physical activity in children

Van Camp et al. (2022) strapped heart-rate watches on kids and let them run in different on-off patterns. They tried 10-s, 30-s, and 60-s running bouts to see which schedule pushed kids into the moderate and vigorous zones.

The team wanted to know if shorter or longer bursts give more minutes above the vigorous line.

Thirty-second runs gave the most time in the moderate zone. No schedule got kids past 50 % of the session in the vigorous zone.

Heart-rate ceilings differed a lot from child to child, so one kid's 'vigorous' was another's 'easy jog'.

Sasson et al. (2022) already showed Polar and Mio Fuse watches feel fine on kids with autism and give clean data. Van Camp adds the next step: once the watch is on, 30-s bouts are your best bet for moderate effort.

Miller et al. (2023) bundled self-monitoring, goals, and rewards to lift step counts in class. Van Camp says timing matters too—pair those rewards with 30-s run breaks to hit moderate heart rates without burning kids out.

Laugeson et al. (2014) found fixed playground equipment plus peers pushed preschoolers into the most MVPA. Van Camp agrees that structure helps, but warns even perfect equipment plus peers may still fall short of true vigorous time.

If you want heart-rate evidence that kids are working hard, program 30-second run cycles. Track each child's own peak rate—don't trust a age-predicted chart. Pair these bursts with Miller's goal-and-reward package and schedule them on A et al.'s fixed equipment to squeeze the most moderate minutes out of every recess or PE block.