The Claim
During one-minute anaerobic cycling in healthy young adults, β-endorphin and adrenaline concentrations increase in parallel with a moderate positive correlation (r = 0.65), indicating a coordinated neuroendocrine response to short-term, high-intensity metabolic stress.
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 healthy young adults, short bursts of intense cycling cause simultaneous increases in β-endorphin and adrenaline levels, and these two hormones rise together in a predictable pattern.
See the scientific wording
In healthy young adults, β-endorphin and adrenaline concentrations increase in parallel during one-minute anaerobic cycling, with a moderate positive correlation (r = 0.65), suggesting a coordinated neuroendocrine response to short-term, high-intensity metabolic stress.
When muscles work so hard that they run out of oxygen, they produce lactic acid, which signals the brain to activate two systems at once: one releases a pain-blocking hormone called β-endorphin from the pituitary gland, and the other releases adrenaline from the adrenal glands. These two hormones rise together because they are triggered by the same intense physical stress.
What the research says
1 studyWhen healthy young adults did a one-minute all-out bike sprint, their bodies released more of two hormones—β-endorphin and adrenaline—and these two went up together, like a team responding to intense exercise.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
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