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Analysis of bacterial flora in dohyo soil
Tetsuaki Osafune1, Masahiro Mitsuboshi, Takashi Ito
1Department of Life Science, Nippon Sport Science University, 1221 Kamosida, 227-0033, Yokohama, Japan, osafunct@nittai.ac.jp.
Environmental Health and Preventive Medicine
|March 25, 2011
Summary
Sumo wrestlers
Area of Science:
- Microbiology
- Sports Science
Background:
- Sumo wrestling is a vigorous contact sport with inherent injury risks.
- Sumo wrestlers wear minimal protective gear, exposing them to microorganisms in the dohyo (wrestling ring).
- The bacterial flora of the dohyo is poorly understood, hindering infection prevention.
Purpose of the Study:
- To identify the aerobic bacterial flora in the dohyo throughout the year.
- To investigate the impact of salt, a traditional sumo practice, on dohyo bacterial composition.
Main Methods:
- Utilized the Vitek AMS system for automatic identification of bacterial species.
- Analyzed dohyo soil samples collected across four seasons.
- Examined the effect of salt on bacterial flora composition.
Main Results:
- Identified 16 bacterial genera and 32 species in dohyo soil.
- Observed seasonal variations in bacterial flora.
- Found that Gram-negative bacteria predominate without salt, while Gram-positive cocci increase after salt addition, with a transient decrease in overall flora.
Conclusions:
- Dohyo soil harbors significant bacterial flora year-round.
- Salt does not eliminate bacteria; it transiently alters the flora composition.
- Understanding dohyo microbiology can inform strategies for preventing wrestler infections.
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