Performance, biochemical, and endocrine changes during a competitive football game

Area of Science:

• Sports Science
• Exercise Physiology
• Biochemistry

Background:

• American football is a high-intensity sport demanding significant anaerobic power.
• Understanding the physiological stress and performance decrements during competition is crucial for athlete management.
• Previous research has not examined anaerobic power during actual collegiate football games.

Purpose of the Study:

• To investigate anaerobic power performance during an intercollegiate American football game.
• To assess biochemical and endocrine responses to evaluate physiological stress during competition.

Main Methods:

• Twenty-one NCAA Division III football players were divided into starters (ST) and red-shirt players (RS).
• Anaerobic power was measured before and after each quarter.
• Blood samples were collected pre-game and post-game to analyze biochemical and endocrine markers.

Main Results:

• Peak force and power decreased from pre-game to the second quarter in both groups, returning to baseline by the fourth quarter.
• Starters exhibited greater peak force and power compared to red-shirt players.
• Cortisol levels were higher in starters post-game, and myoglobin and aspartate aminotransferase increased in starters, indicating muscle damage.

Conclusions:

• Competitive American football games induce performance decrements in anaerobic power.
• Physiological and biochemical markers indicate significant stress and muscle damage in players.
• Findings highlight the demanding nature of collegiate football and its impact on athlete physiology.