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Finger length could predict mental grit on the soccer field

NCT ID NCT07689513

Knowledge-focused Sponsor: Istanbul Gelisim University Source: ClinicalTrials.gov ↗

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Cancelled before anyone took part.

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First seen Jul 08, 2026 · Last updated Jul 09, 2026 · Updated 1 time

Summary

This study looks at whether the ratio of a person's index finger to ring finger (2D:4D)—a marker of prenatal hormone exposure—relates to mental toughness in amateur soccer players. Researchers measured finger lengths and surveyed 270 players about their mental resilience. The goal is to see if brain type, playing position, and psychological strength are connected.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If links are found, this could help coaches tailor mental training to players' natural psychological profiles.
What could go wrong
This is an observational study—it can show associations but not cause and effect. Results may not apply to professional athletes or other sports.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

270 people

The number who actually took part.

Started

Mar 2025

Finished

Apr 2025

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Licensed amateur soccer players recruited from amateur soccer clubs in Denizli, Türkiye. Participants represented different playing positions, including goalkeepers, defenders, midfielders, and strikers.

Ages

16 to 40 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Licensed amateur soccer player. * Aged between 16 and 40 years. * Currently participating in regular soccer training and competitions. * Able to understand and complete the Sports Mental Toughness Questionnaire (SMTQ). * Provided written informed consent prior to participation. Exclusion Criteria: * Professional soccer players. * History of neurological or psychiatric disorders that could affect psychological assessment. * Upper extremity deformity or injury preventing accurate 2D:4D measurement. * Incomplete questionnaire or missing study data. * Declined or withdrew informed consent.

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

2D:4D digit ratio Football Mental toughness Sports psychology

Contacts and locations

Locations

  • Istanbul Gelisim University

    Istanbul, Istanbul, 34290, Turkey (Türkiye)

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