The Claim
In adults with type 2 diabetes mellitus, higher cardiorespiratory fitness is associated with increased root mean square of successive differences (RMSSD), a time-domain marker of parasympathetic nervous system activity, with a correlation coefficient of r = 0.89.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In adults with type 2 diabetes, greater aerobic fitness is linked to higher RMSSD, a measure of parasympathetic nervous system activity.
See the scientific wording
In adults with type 2 diabetes mellitus, higher cardiorespiratory fitness is associated with increased root mean square of successive differences (RMSSD) (r = 0.89), the most sensitive time-domain marker of parasympathetic nervous system activity, indicating a strong link between aerobic capacity and vagal tone.
When a person becomes more physically fit, their heart and blood vessels respond more efficiently to changes in demand, which strengthens the nerve that slows the heart rate. This nerve sends stronger signals to the heart, causing the time between heartbeats to vary more, which is measured as higher RMSSD.
What the research says
1 studyIn people with type 2 diabetes, those who are more physically fit had heart rate patterns showing much stronger activity from the vagus nerve — the nerve that helps slow the heart and calm the body. The study found a very strong link between fitness level and this calming nerve activity.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.