The Claim
In well-trained male cyclists, a 6-day high-fat diet providing 68% of energy from fat is associated with a tendency toward increased activation of the sympathetic nervous system, as reflected by elevated low-frequency power in heart rate variability (P = 0.056), and this effect remains detectable after one day of carbohydrate loading.
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.
If male cyclists eat a super high-fat diet for six days, their body's 'fight or flight' system might get a bit more active — and that change doesn’t go away right after they start eating carbs again.
See the scientific wording
In well-trained male cyclists, a 6-day high-fat diet (68% fat energy) is associated with a tendency toward increased sympathetic nervous system activation, as indicated by a higher low-frequency power component of heart rate variability (P = 0.056), and this effect persists after 1 day of carbohydrate loading.
What the research says
1 studyStudy: Fat adaptation followed by carbohydrate loading compromises high-intensity sprint performance.
The study looked at cyclists who ate a high-fat diet for 6 days and then loaded up on carbs. It found a hint of increased stress on the nervous system, just like the claim says.
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.