The increase in body mass due to significant muscle tissue expansion is not a likely benefit of creatine monohydrate supplementation for athletic performance; instead, benefits are more related to the production of ATP and increased water content in muscle cells.
The benefits of creatine monohydrate supplementation that are NOT likely when it comes to potential improvements in athletic performance are specifically: Increased body mass due to a significant increase in muscle tissue. This is because while creatine does increase muscle creatine content for improved ATP production, and can increase maximal strength through higher intensity training, significant increases in muscle mass are not typically achieved through supplementation alone without concurrent resistance training.
Supplementing with creatine monohydrate primarily enhances the body's ability to perform high-intensity work and supports muscle recovery by increasing the production of ATP, leading to improved strength and power output. However, a direct correlation between creatine supplementation and substantial muscle mass increase is not well-supported by evidence. Instead, any increase in body mass is often due to increased water content in the muscles, not necessarily an expansion of muscle tissue itself.
Creatine benefits also include what is known as cell volumization, which is the process of drawing water into muscle cells -- making them larger. It is important to note that this should not be confused with the misconception that creatine leads to general bloating. Finally, while creatine is linked with many performance-enhancing effects, the assumption that it will significantly increase muscle tissue is misplaced without additional factors such as resistance training and proper nutrition.