TPCT Underwater Rugby Women

A parallel, two-arm randomized controlled trial will be conducted in an elite women's underwater rugby squad. Players will be allocated 1:1 to TPCT or an active control condition using a computer-generated random sequence. The intervention consists of 18 sessions over 6 weeks (3/week), 2 hours per session, delivered in an outdoor 4 m pool and a marked 10 m × 8 m underwater area. Sessions include a short coach introduction (~15 min), constrained small-sided games designed to elicit target tactical principles, and ≥60 min free-play (≥50% of session) to preserve representativeness and transfer. The TPCT condition embeds ~3 min structured reflection between small-sided bouts using a fixed 5-question protocol aligned to critical thinking operations; the control condition uses equivalent between-bout time for passive recovery/hydration.

Inclusion criteria

• Female elite underwater rugby players aged ≥18 years.
• Officially rostered members of the participating high-performance team/squad.
• Regular training participation (minimum 2 sessions per week) in the team's programme.
• Able to complete study procedures at Baseline (Visit 1) and Post-intervention at 6 weeks (Visit 2), including standardized 3v3 scrimmage video assessment.
• Willing and able to provide written informed consent.

Exclusion criteria

• Current injury, illness, or medical condition that prevents full participation in regular underwater rugby training during the intervention period.
• Anticipated prolonged absence (e.g., travel/competing/other commitments) that would prevent meaningful exposure to the intervention dose (e.g., missing >20% of sessions).
• Inability to complete the assessment procedures reliably (e.g., unable to participate in the standardized 3v3 assessment or comply with study instructions).
• Declines participation or withdraws consent.