Protein metabolism is important because it plays a role in energy production, particularly during prolonged physical activity.
Here's a breakdown of its significance:
Energy Contribution During Exercise
While protein is not the primary fuel source for energy, it becomes increasingly important during exercise.
- Short Duration Exercise: Protein metabolism contributes only a small amount (2-3%) to the energy requirement during exercises lasting just a few minutes.
- Prolonged Exercise: As the duration of physical work extends to several hours, protein's contribution to energy production can rise significantly, potentially reaching as much as 12%. This is important for endurance activities like marathon running or long-distance cycling.
Protein Metabolism and Nitrogen Excretion
The reference also mentions protein metabolism and nitrogen excretion being described in Chapter 15. While not providing specific details, this highlights that protein metabolism also plays a role in waste removal from the body.
Summary Table
| Exercise Duration | Protein Metabolism Contribution |
|---|---|
| Few minutes | 2-3% |
| Several hours (prolonged) | Up to 12% |
In conclusion, protein metabolism is important not only for building and repairing tissues, but also as a supplementary energy source during extended periods of physical exertion.
