Cardiac autonomic modulation and exercise capacity in older adults with intellectual disability: A 6-month randomised control trial.
Six months of bike sprints plus weights helps older adults with ID move faster but does not improve resting heart-rate control.
01Research in Context
What this study did
Andrews et al. (2024) compared two six-month exercise programs for older adults with intellectual disability. One group did short, hard sprint bursts on bikes. The other group did steady, moderate cycling.
Both groups also lifted weights and stretched. Staff tracked how fast each person walked, how high their heart rate jumped at the start of exercise, and how their heart rate settled after exercise.
What they found
The sprint group got faster on walking tests and their heart rate rose more quickly when exercise started. These are signs of better fitness.
Resting heart-rate patterns and recovery speed did not change in either group. The training helped movement, but not the calm-heart signals many trainers hope to see.
How this fits with other research
Ellingsen et al. (2014) already showed that mixing aerobic, strength, and balance work boosts fitness in adults with ID. Andrews et al. (2024) narrows the recipe: sprint intervals work just as well as steady cardio when weights are added.
Borji et al. (2013) warned that adults with ID tire faster during hard interval work. The new study seems to disagree, but the earlier test used younger adults in a lab with no strength training. Adding weights and longer rest may explain why the older group improved instead of fatiguing.
Bigham et al. (2013) found blunted heart-rate reflexes in ID, and Chang et al. (2012) showed low resting heart-rate variability is common. Andrews et al. (2024) now confirms that six months of exercise, even with sprints, does not fix these deep autonomic limits.
Why it matters
If you run day programs for older adults with ID, swap one steady cardio session for short bike sprints followed by longer rest. You will likely see faster walking and stronger heart-rate kick-offs without extra staff time. Do not wait for resting heart-rate variability to rise; use walk speed and quick heart-rate rise as your win markers instead.
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02At a glance
03Original abstract
BACKGROUND: Despite reported physical and functional improvements with aerobic and sprint interval training (SIT) protocols in individuals with intellectual disability (ID), it is not known if these interventions' effectivity would promote improvements in cardiac autonomic modulation. This study aimed to investigate if a 6-month SIT or a continuous aerobic programme could enhance physical performance and cardiac autonomic modulation at rest, during physical activity (PA) and after it in older adults with an ID. METHODS: This is a randomised control trial. Participants with ID (age: 50.58 ± 7.25) were allocated to one of three groups [multicomponent aerobic training group (MATG), multicomponent interval sprint training group (MISTG) and control group (CG)]. The programmes lasted 24 weeks, with three sessions/week, 75-90 min per session. The HRV was analysed at rest and recovery, the delta of heart rate (HR) was analysed during 6MWT, and the HR t-off kinetics was analysed in recovery after 6MWT. RESULTS: There were not found differences between groups, moments, or interaction for cardiac autonomic modulation at rest and recovery. During exercise, only MSITG showed a significant increase of HR between rest and the first 30 s of exercise (P < 0.05). Physical performance increased only in MSITG (P < 0.05), while CG showed a significant reduction (P < 0.01). CONCLUSIONS: The MSITG improved the physical performance and the vagal withdrawal at the beginning of the submaximal exercise. These findings suggest that high-intensity exercise may positively impact baroreflex function, mitigating the decline in autonomic reflex response capacity associated with aging in individuals with ID.
Journal of intellectual disability research : JIDR, 2024 · doi:10.1111/jir.13162