Can height categories replace weight categories in striking martial arts competitions? A pilot study

Area of Science:

• Sports Medicine
• Pediatric Sports Science
• Combat Sports Physiology

Background:

• Combat sports and martial arts frequently utilize weight categories for competition.
• Weight categorization is associated with disordered eating behaviors and rapid pre-competition weight loss in athletes.
• Concerns exist regarding the health implications of these practices for young athletes.

Purpose of the Study:

• To investigate height categorization as a potential alternative to weight categorization in combat sports.
• To evaluate the impact of height categories on competitor variability and athlete health.
• To explore methods for reducing disordered eating behaviors in child and adolescent athletes.

Main Methods:

• Measured height and weight of 169 child and adolescent competitive karate athletes.
• Created hypothetical weight categories (5 kg increments) and height categories (5 cm increments).
• Calculated coefficient of variation for height and weight within each categorization method and analyzed category shifts.

Main Results:

• A strong positive correlation (r = 0.91, p<0.001) was observed between height and weight.
• Dividing athletes by height categories reduced the mean range of heights within categories by 83%.
• Approximately 74% of athletes would shift by at most one category if allocated by height instead of weight.

Conclusions:

• Height categorization significantly narrows the range of competitor heights in youth karate.
• This method is unlikely to result in athletes competing against substantially heavier opponents.
• Height categorization warrants further investigation as a strategy to combat eating disorders in combat sports.