After a sprinting event, the muscles of the athletes gets tired and they need to repair themselves immediately. Using the understanding from Q 1.5, suggest the supplement that needs to be taken by athlete in order to recover immediately with proper justification.

The supplement that needs to be taken by the athlete in order to recover immediately is protein. Here's why:

1. Muscle Repair: After a sprinting event, the muscles of the athletes get micro-tears due to the intense physical activity. Protein is the building block of muscles and is essential for the repair and rebuilding of muscle tissues.

2. Muscle Growth: Protein supplementation promotes muscle protein synthesis and aids in the growth of muscle mass, which is beneficial for athletes.

3. Recovery: Protein helps in the recovery of muscles by reducing muscle damage and improving muscle performance and muscle protein synthesis after intense exercise.

4. Energy: Although carbohydrates are the body's preferred source of energy, protein can also be used as a source of energy when the body is low on carbohydrates.

Therefore, a protein supplement is ideal for an athlete to recover immediately after a sprinting event. It's recommended to consume the protein supplement within 30 minutes after the exercise for optimal recovery.