Protein Needs Explained: How Endurance Athletes Differ from Power Athletes

Protein Requirements Explained: How Endurance Athletes Differ from Power Athletes

Introduction

For a long time, discussions about protein supplementation have been dominated by gym culture. However, the ISSN position stand published in 2017 clearly states that endurance athletes’ daily protein requirements (1.2–1.6 g/kg) are not lower than those of general strength trainees (1.4–1.7 g/kg)—the gap between the two is far smaller than commonly perceived. More importantly, protein’s role in endurance sports goes far beyond “building muscle”—it is essential for repairing micro-damage, maintaining bone health, supporting the immune system, and serving as a backup fuel source when energy is insufficient.

Endurance vs. Power: Similarities and Differences in Requirements

Category	Endurance Athletes (Run/Cycle/Swim)	Power/Strength Athletes
Daily Protein	1.2–1.6 g/kg	1.4–2.0 g/kg
Primary Needs	Repair oxidative damage, maintain muscle mass	Muscle hypertrophy, neuromuscular adaptation
Timing Sensitivity	Moderate (within 2 hours post-training)	High (within 30 minutes post-training)
Leucine Threshold	2–2.5 g/meal	2.5–3.5 g/meal
Optimal Amount Per Meal	20–30 g	25–40 g

During periods of high training volume (especially during caloric restriction or weight loss phases), endurance athletes may need to increase protein intake to 1.8–2.0 g/kg to prevent muscle breakdown.

Four Key Roles of Protein in Endurance Sports

1. Repairing Oxidative and Mechanical Damage

Every long run or long ride causes micro-tears in muscle fibers and oxidative stress. Adequate protein allows muscles to complete repair within 24–72 hours, reducing residual damage before the next training session.

2. Maintaining Muscle Mass

During prolonged low-intensity training, branched-chain amino acids (BCAAs) can be directly oxidized for energy. If dietary protein is insufficient, the body will break down muscle protein to compensate.

3. Supporting the Immune System

The “open window theory” after training causes a temporary decline in immune function. Amino acids such as glutamine serve as fuel for immune cells, and adequate protein intake helps maintain immune defenses.

4. Bone and Connective Tissue Health

Collagen synthesis requires amino acids such as glycine and proline. Combined with vitamin C, this strengthens tendons and ligaments, reducing sports injuries.

Food Sources and Practical Application for Taiwanese Athletes

Food	Portion	Protein (g)	Highlights
Chicken breast (cooked)	100g	23	Low fat, rich in leucine
Salmon	100g	20	Omega-3 anti-inflammatory
Eggs	1 piece	6.5	Complete amino acids, PDCAAS=1.0
Greek yogurt (unsweetened)	170g	15–17	Calcium + protein
Tofu (firm)	150g	11	Top vegetarian choice, contains calcium
Edamame	100g (cooked)	11	Carbs + protein dual benefit
Whey protein powder	30g	22–26	Rapid absorption post-training

Daily Distribution Principle: Research shows that spreading protein intake across multiple meals (20–30g per meal, 4–5 meals) stimulates sustained muscle protein synthesis more effectively than one large bolus. The typical Taiwanese pattern of three meals plus one post-training supplement fits this recommendation perfectly.

Special Scenario Adjustments

Weight Loss Phase: Under a caloric deficit, increase protein to 1.8–2.2 g/kg to preserve muscle mass.
Peak Competition Season: When training volume is at its highest, ensure at least 1.6 g/kg daily, with quality protein sources at every meal.
Injury Period: Tissue repair demands increase; protein can be raised to 2.0 g/kg, paired with vitamin C to promote collagen synthesis.
Masters Athletes (40+): “Anabolic resistance” means each meal requires more leucine (recommended 3g or more) to achieve the same muscle protein synthesis response.

Practical Recommendations

Include a serving of quality protein (eggs, tofu, meat, or dairy) at every meal.
Consume food or drinks containing 20–25g of protein after training.
Using 7-Eleven as an example: two tea eggs (13g) + one cup of cottage cheese (approx. 12g) = 25g, a quick on-the-go solution.
No need to fixate on animal protein—plant proteins such as beans, tofu, dried tofu, and edamame can fully meet requirements when varied and combined properly.

Conclusion

Endurance athletes equally need to prioritize protein—not to build bulky muscles, but to ensure more complete recovery after each training session, a more robust immune system, and more durable bones and connective tissue. 1.2–1.6 g/kg is the baseline; during high training volumes or weight loss phases, it can be increased to 1.8–2.0 g/kg. These numbers are not difficult to reach—the key lies in consciously planning each meal.