Sigh-based (physiological / cyclic)

Compared in the reviewR8 · 1 full-text paper, 1 abstract-only

At least one paper behind this review states what this option was measured against. That is not a ranking, and this option carries no evidence profile of its own.

Round-2 tier-3 flag: thin - under 4 full-text papers.

Requirements it fills

acute stress / anxiety downregulation
Emotional · 1 paper put it here
daily regulation practice
Emotional · 1 paper put it here

How it is performed

Emphasizes prolonged exhalations. Posture: Sit or lie down with eyes closed, focusing on forehead. Duration: 5 minutes.
Melis Yilmaz Balban, E. Neri, Manuela M. Kogon et al. (2023) · Cell Reports Medicine · 10.1016/j.xcrm.2022.100895
Brief structured respiration practices enhance mood and reduce physiological arousal

Dose

Nothing states what this option's dose measures — no library step prescribes this option and its review states no dose unit.

Dose and time, as the papers state it

within a 20-second time window
E. Vlemincx, J. Taelman, I. Diest, O. Bergh (2010) · Physiology and Behavior · 10.1016/j.physbeh.2010.04.015
Take a deep breath: The relief effect of spontaneous and instructed sighs

Equipment

Equipment is a property of the movement and is authored, never derived from the evidence corpus (docs/research/round2/ROUND2_KNOWN_CORRECTIONS.md §1). This option resolves to no catalogue exercise, so nothing has authored it yet.

Level and prerequisites

R8's level field records who was eligible for the trial, not what a person needs before trying the practice, so it is not carried here.

Progression and regression

No row states how to make this option harder or easier.

Who should not do this

The papers behind this option report nothing on contraindications, which is not the same as saying there are none.

Setting, as the studies used it

No row describes the setting.

What the papers compared it with

Box breathing — a paper measured this option against it
“box breathing” · Melis Yilmaz Balban, E. Neri, Manuela M. Kogon et al. (2023) · 10.1016/j.xcrm.2022.100895

A paper measuring one option against another does not make the two interchangeable, and it does not say which to choose. These are listed as what the papers did, and nothing here proposes a substitution.