5.3

Reliability and Validity of the Myers-Briggs Type Indicator® Instrument

Personality and mental toughness of the Marathon Maniac


Thompson, B., Mauldin, K. & Hart, K. (2023).
Personality and mental toughness of the Marathon Maniac.
Open Journal of Social Sciences, 11(12), 376-391.

Like many vocations, hobbies, and lifestyle pursuits, extreme sports attract distinct personality types. This study examined a group of runners called the Marathon Maniacs, who focus on frequency of marathons rather than speed or winning.

The personality traits and mental toughness of Marathon Maniacs were assessed through the NEO Five Factor Inventory, the MBTI® instrument, and the Inventory of Mental Toughness Factors in Sports. A total of forty-two participants, Age M = 48; 20 males (47.6%), 22 females (52.4%), completed the assessments.

Results showed that Marathon Maniac members were low in neuroticism, high in openness, and also in conscientiousness. MBTI results revealed overrepresentation of particular types and preferences. Notably, Marathon Maniac members were 7.52 times more likely to be INTJ types, 3.10 times more likely to be INFJ types, 2.47 times more likely to be INFP types, 1.88 times more likely to be ENFJ types, and 1.81 times more like to be ENTJ compared to a normative sample. Overrepresentation was also examined for preferences and found a strong overrepresentation of IN, NT, and TJ as these were 2.72, 1.94 and 1.76 times more frequent than what is represented in the representative sample.


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Journal of Psychological Type® Research Digest (JPT-RD) is made available through Myers & Briggs Foundation, worldwide publisher. The editorial team includes Kesstan Blandin, PhD, Logan Abbitt, MLIS, and Purnima Sims.

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Myers & Briggs Foundation carries the legacy of Isabel Briggs Myers and the MBTI® instrument through our mission to educate the public about psychological type—including its ethical, meaningful, and practical applications—and to conduct research on psychological type and the Myers-Briggs Type Indicator® (MBTI) instrument. The JPT-RD, published annually, is a publication that highlights research and ideas in the field of psychological type, the MBTI Instrument, and Jungian thought.

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