Acute exercise can alter some physiological markers of psychological stress reactivity and recovery, with more consistent effects for blood pressure and cortisol than for heart rate or self-reported stress.

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Chafin et al. found faster blood-pressure recovery after brief post-stress exercise in a randomized experiment. Morava et al. systematically reviewed 31 studies and found reliable reductions in blood-pressure and cortisol reactivity, mostly negligible heart-rate effects, and negligible self-report effects.

The evidence does not establish that all movement accelerates recovery, that subjective stress reliably improves, or that exercise is always the right first transition after psychological load.

The public claim is narrower than the manuscript because the cited evidence concerns acute exercise rather than movement in general.

Supported by appropriate human studies, major reviews, trials, cohort research, or converging evidence. The strength of the category does not remove population, dose, timing, or context limitations.

Sources are listed according to the role they play in this claim. One source may provide direct support, another may explain a mechanism, establish a limitation, or prevent an interpretation from becoming broader than the evidence allows.

The printed book preserves the claim inside the argument that gives it meaning. These references connect the current digital record to the first-edition evidence trail.

This claim connects to the following parts of the Human OS architecture. The module labels locate the claim inside the framework; they do not imply that the research source validates the architecture itself.