The Rise of Female Ultramarathon Runners: Women's Physiological Advantages in Long-Distance Running

Introduction

In a standard marathon (42.195 km), the world’s top female runners finish about 10–12% slower than their male counterparts. However, when the distance extends to 100 km, 100 miles, or even multi-day races, this gap narrows significantly—and in some events, it disappears entirely.

At the 2002 Western States 100-mile endurance race, female runner Ann Trason had won the overall title 14 times (beating all men). In 2019, Courtney Dauwalter placed in the overall top three in multiple 100-mile-and-beyond ultramarathons. This is no coincidence; it is a concrete manifestation of female physiological traits providing an advantage at extreme distances.

Women’s Physiological Advantages at Ultra-Long Distances

1. Higher Fat Metabolism Efficiency

The energy demands of an ultramarathon far exceed an individual’s muscle glycogen stores. As distance increases, fat metabolism (fat oxidation) plays an increasingly important role in energy supply:

• Women naturally have a higher body fat percentage, and estrogen promotes the activity of fat oxidation enzymes
• Research shows that at the same relative intensity, women oxidize fat at a rate 20–30% higher than men
• The longer the distance, the more pronounced this advantage: In ultramarathons over 100 km, performance relies almost entirely on fat metabolism

2. Better Pacing Stability

Research shows that female marathon and ultramarathon runners experience less pace fade than men—meaning women are less likely to “hit the wall” in the latter half of a race. Possible reasons include:

• Women manage their pace more conservatively during races (fewer strategic errors from starting too fast)
• Estrogen’s muscle-protective effects delay muscle fatigue
• Greater emotional regulation abilities help cope with prolonged physical and mental stress

3. Emotional Regulation and Mental Resilience

An ultramarathon is not just a physical challenge; it is a mental marathon. Women often demonstrate unique psychological strategies in dealing with pain, setbacks, and long periods of monotony:

• Dissociation techniques: Shifting attention away from pain to the external environment (scenery, sounds)
• Stronger social motivation: Seeking emotional support from aid station volunteers and pacers during low points
• Emotional acceptance: Accepting that “discomfort is normal” rather than resisting it

4. Heat Adaptation (at Long-Distance, Low-Intensity Efforts)

Although women have slightly weaker thermoregulation during short, high-intensity exercise, at the long-duration, low-intensity pace of an ultramarathon, women are actually just as efficient at maintaining body temperature—particularly during cold nighttime segments, where women’s insulation ability is actually superior.

Stories of Taiwan’s Female Ultramarathon Runners

In Taiwan’s ultramarathon scene, female runners are rising rapidly:

• The proportion of female participants in Taiwanese ultramarathon events (such as those organized by TUMA, the Taiwan Ultramarathon Association) continues to rise
• Taiwanese female runners have repeatedly achieved outstanding results in Asian ultramarathon events such as the Ultra-Trail Mt. Fuji (UTMF) and the Hong Kong 100
• The proportion of “mother ultramarathon runners” is impressive—many Taiwanese women discover a passion for ultramarathons after giving birth

Special Considerations for Female Ultramarathon Training

Despite their physiological advantages, female ultramarathon runners still need to pay attention to the following special issues:

Energy management: Gastrointestinal issues during ultramarathons (nausea, vomiting) are more common in women, especially when racing before menstruation or during the luteal phase. Recommendations: choose easily digestible energy foods (congee, rice cakes, potatoes) rather than high-sugar gels; simulate race conditions during long training runs to test tolerance of your nutrition plan.

Nighttime safety: Ultramarathons often include nighttime sections. Female runners should factor safety into their pacing plans and try to run with companions.

Foot care: Women’s toe joint shapes vary greatly, making blisters and black toenails more likely during ultramarathons. It is essential to break in shoes thoroughly before race day and learn taping techniques.

Practical Advice

1. Don’t underestimate your ultra-distance potential: If you pace steadily in the second half of marathons, you may be even more competitive in ultramarathons
2. Start with a 50K ultramarathon: Taiwan has many 50K trail ultramarathons (such as XTERRA and various county trail races), making them an ideal entry point into the ultramarathon world
3. Place special emphasis on nighttime running practice: Night runs train your adaptation to ultramarathon nighttime sections and also require practicing with a headlamp
4. Join Taiwan’s ultramarathon community: Platforms like the Facebook group “台灣超馬選手” (Taiwan Ultramarathon Runners) offer abundant training information and race resources
5. Leverage your fat metabolism advantage: Try “fasted runs” (easy runs on an empty stomach) to train your fat metabolism system—an important tool in ultramarathon training

Conclusion

Ultramarathons are becoming the competitive arena where female runners can most fully leverage their physiological advantages. In this discipline that demands the most endurance, resilience, and wisdom, the stereotype of “female physical limitations” is being shattered race after race. The story of Taiwan’s female ultramarathon runners is just beginning, and sports science is telling us: the long road ahead may, in fact, be made for women.

Related Reading

• The Female Ultramarathon Challenge: Women’s Physiological Advantages in Ultra-Distance Events
• Physiological Profiling of Ultramarathon Runners: Metabolic Phenotypes of 100-Mile Finishers
• Physiological Characteristics of Female Ultramarathon Runners: Research on the Gender Gap Narrowing with Distance
• Female Marathon Training Specifics: Adjusting Training Plans Compared to Men