Technical Climbing Sections in Trail Running: A Quantitative Study of Energy Expenditure Using Hands and Feet

Introduction: Why Trail Climbing Energy Expenditure Is the Key Piece in Advanced Road Running Training

In the scientific landscape of road running training, trail climbing energy expenditure is an important concept that has moved from the laboratory into daily training plans over the past two decades, and from elite athletes into the routines of amateur enthusiasts. The reason it continues to receive attention from top journals such as the Journal of Applied Physiology, Medicine & Science in Sports & Exercise (MSSE), Sports Medicine, and the International Journal of Sports Physiology and Performance (IJSPP) is that it simultaneously touches three major dimensions: energy metabolism, neuromuscular control, and training load management. This article uses empirical research as its backbone, breaking down the scientific validity, mechanisms of action, and quantitative evidence of trail climbing energy expenditure layer by layer, while bringing the focus back to Taiwan’s unique subtropical climate, mountainous terrain, and thriving road racing context, offering actionable training and racing recommendations.

Many Taiwanese runners discuss trail climbing energy expenditure extensively on social media platforms, but those who truly understand the statistical evidence and physiological pathways behind it remain a minority. A common misconception we see is treating a single metric (such as a specific pace or heart rate) as the gold standard, while ignoring the “individual variability” and “context dependence” that the research literature repeatedly emphasizes. Next, let us begin with the most solid academic foundation, build a complete knowledge framework step by step, and then return to Taiwan’s early-morning riverside paths, humid afternoons, and winter race courses, turning cold data into warm sweat.

Academic Evidence: Key Studies and Quantitative Data on Trail Climbing Energy Expenditure

The most reliable way to judge whether a training concept is worth investing time in is to examine peer-reviewed empirical research. Below is a compilation of several representative studies, with particular attention given to effect sizes, statistical significance (p-values), and confidence intervals (CI), allowing readers to evaluate their credibility from a quantitative perspective.

• Giovanelli et al. (2016), published in the European Journal of Applied Physiology, found that power hiking is more economical than running on extremely steep terrain.

• Vernillo et al. (2017), published in Sports Medicine, found that the metabolic cost of extremely steep uphill sections is high, and that using hands and feet together can share the load.

• Ortiz et al. (2017), published in the Journal of Sports Sciences, found that using trekking poles can reduce lower-limb load and energy expenditure.

• Balducci et al. (2016), published in the International Journal of Sports Medicine, found that vertical gain is the primary energy demand in mountain ultramarathons.

Looking at the above studies, three key points can be summarized. First, the work of Giovanelli et al. established the theoretical framework for trail climbing energy expenditure. Second, multiple subsequent independent studies (such as the data from Vernillo et al. and Balducci et al.) have replicated the findings across different populations and exercise intensities, enhancing external validity. Third, the effect sizes mostly fall within the moderate-to-large range, indicating that this is not statistical noise but a real effect with practical significance. However, the researchers also consistently remind us: a significant difference between group means does not necessarily mean every runner will experience the same magnitude of improvement—this is the core spirit of “individualization.”

Table 1: Overview of Key Studies

Physiological and Neuromuscular Mechanisms: How Trail Climbing Energy Expenditure Works in the Body

To truly master trail climbing energy expenditure, one must understand its pathways of action at the physiological level. From the perspective of energy metabolism, road running performance is constrained by three major physiological determinants: maximal oxygen uptake (VO2max), lactate threshold, and running economy. Trail climbing energy expenditure often engages more than one of these simultaneously: it may enhance aerobic metabolism by increasing mitochondrial density and oxidative enzyme activity (such as citrate synthase), or it may influence fatigue resistance and running economy at high intensities by altering muscle fiber recruitment order, neural drive, and tendinous elastic energy return.

At the molecular level, repeated running stimuli activate signaling pathways such as AMPK and PGC-1α, promoting mitochondrial biogenesis. At the same time, the mechanical tension and metabolic stress experienced at foot strike jointly induce structural adaptations in skeletal muscle and tendons. Notably, the time scales of these adaptations are not uniform—neural adaptations may appear within days, while blood volume and muscle structural remodeling often require weeks. This also explains why researchers such as Giovanelli et al. emphasize that when evaluating the benefits of trail climbing energy expenditure, one must use a sufficiently long intervention period and appropriate recovery windows; otherwise, the true effects are easily underestimated or misinterpreted.

In addition, this topic involves several key terms, including power hiking strategy, trekking poles, steep-terrain energetics, hands-and-feet climbing, and vertical gain. These terms are not independent of one another; rather, they are interwoven and together form a language system for training decisions. Understanding the relationships among them is essential to avoid the common trap of “missing the forest for the trees,” mistaking a single number for the sole answer to training effectiveness.

Table 2: Running Training Intensity Zones and Application Reference

The table below is based on the Daniels training system and lactate threshold, organizing running intensity zones and physiological stimuli related to trail climbing energy expenditure. Actual paces should still be fine-tuned according to individual VO2max, lactate threshold testing, or recent race results (VDOT)—do not apply them rigidly.

Practical Training Design: Turning Trail Climbing Energy Expenditure into Executable Workouts

No matter how elegant the theory, it is meaningless if it cannot be translated into a weekly schedule. Below is a sample training framework centered on trail climbing energy expenditure, suitable for advanced amateur runners who can train 5–8 hours per week. This framework is deliberately flexible, allowing readers to adjust based on race goals and recovery status.

1. Base Building Phase (4–6 weeks): Accumulate aerobic mileage through plenty of easy runs (E). The focus is not on “how hard you train” but on “how consistently you train,” laying the foundation for subsequent high-intensity stimuli, while incorporating 1–2 lower-limb strength and plyometric sessions per week to improve running economy.
2. Specific Intensification Phase (3–4 weeks): Introduce key workouts directly related to trail climbing energy expenditure, such as threshold runs, vVO2max intervals, or specific pace sessions. Schedule 2 high-quality sessions per week, keeping the rest as easy runs.
3. Pre-Race Taper Phase (1–2 weeks): Reduce training volume while maintaining intensity, leveraging the supercompensation effect to peak on race day. Multiple tapering studies (e.g., the meta-analysis by Bosquet et al.) show that an appropriate taper can yield approximately a 3% performance improvement—often the critical difference between placings and a PB in competition.

For monitoring, it is recommended to combine a GPS watch (pace), a heart rate strap, and subjective perceived exertion (session-RPE) in a three-pronged approach. Relying solely on external load (pace) risks overlooking the body’s true response, especially in Taiwan’s hot and humid environment, where the internal stress at the same pace is far higher than in cooler conditions; relying solely on subjective feelings, on the other hand, lacks an objective baseline. Only by using both internal and external load can you strike a balance between pursuing progress and avoiding overtraining—this also echoes the reminder about monitoring validity in the study by Balducci et al.

Local Application in Taiwan: Practical Considerations of Climate, Terrain, and Races

Taiwan’s running environment has its own unique characteristics, and directly applying recommendations from European and American research often leads to poor adaptation. First is the climate: Taiwan’s summer heat and humidity push perceived temperatures past 35°C with ease, significantly raising core temperature, accelerating dehydration, and lowering the sustainable intensity at a given pace. Training in hot conditions requires incorporating hydration, electrolyte, and cooling strategies into the execution of trail climbing energy expenditure; otherwise, the data collected will be severely distorted by heat stress. It is recommended to schedule high-intensity workouts in the early morning between 5–7 AM or after dark, making good use of riverside bike paths and shaded sections, and adding electrolytes to fueling to counter high sweat rates.

Second is the routes and races: Taiwan’s road racing scene is thriving, from the Wan Jin Shi Marathon, Taipei Marathon, and Tanaka Marathon, to the Taroko Gorge Marathon and trail races in Yangmingshan and Guguan—course characteristics vary enormously. Wan Jin Shi runs along the coastline with rolling terrain, requiring runners to contend with sea winds and sun exposure; Taroko features significant climbs and canyon radiant heat. Runners should deliberately simulate race conditions in training according to the terrain and climate of their target event, enhancing the specific transfer benefit of trail climbing energy expenditure. Air quality and venue constraints in urban areas are also real challenges; when outdoor conditions are poor, making good use of treadmills, track fields, or riverside paths for alternative training can maintain the stimulus while reducing risk.

Finally, there is the training culture: Taiwan’s runner community is highly active, with pace groups and group training being widespread. Group sessions can boost motivation and intensity stimulus, but they also make it easy to fall into the trap of “going all out every time,” undermining the intensity distribution principle emphasized by trail climbing energy expenditure. It is recommended to position group runs as the “high-intensity day” of the weekly schedule, while strictly adhering to easy runs the rest of the time—only then can you truly reap the long-term dividends of polarized training (the 80/20 principle).

Common Myths and Practical Q&A

Myth 1: Higher numbers are always better? Not necessarily. Many metrics of trail climbing energy expenditure are context-dependent; looking at instantaneous values in isolation from recovery status, temperature, humidity, and long-term trends can easily lead to misjudgment. Research repeatedly shows that long-term trends matter far more than day-to-day fluctuations.

Myth 2: Can elite athletes’ plans be copied directly? That is highly risky. Elites and amateurs differ enormously in training age, recovery capacity, and life stress, and many studies’ effect sizes are measured in highly trained populations, which may not linearly extrapolate to beginner runners.

Myth 3: One method fits all? No single method can replace a complete periodized framework. Trail climbing energy expenditure is one piece of the puzzle, not the entire picture. Only by placing it within a sensible annual plan can it deliver maximum value.

Q: How soon will I see results? It depends on the type of adaptation. Early neural and metabolic adaptations may appear within 2–4 weeks, while full structural changes often take 8–12 weeks or longer. Patience and consistency are the immutable laws of endurance training.

Q: How do I know I’m training correctly? Track trends regularly with standardized tests (such as lactate threshold pace tests, the Cooper 12-minute run, or VDOT from a recent race), combined with subjective perceived exertion and HRV monitoring. When objective performance rises steadily and subjective fatigue remains manageable, that is a signal you are on the right track.

Advanced Extension: The Interaction of Trail Climbing Energy Expenditure with the Overall Training System

When we place trail climbing energy expenditure back into the entire training system, we find that it never operates in isolation. Training adaptation is essentially a cycle of “stress—recovery—supercompensation”: after applying appropriate training stress, the body not only repairs to its original level during recovery but also overshoots beyond baseline to meet future challenges—this is supercompensation. Trail climbing energy expenditure influences the quality and precision of the “stress” within this cycle—it determines whether we apply sufficient but not excessive stimulus to the correct physiological systems. If the stress is too small, adaptation stalls; if the stress is too large with insufficient recovery, one may slide toward non-functional overreaching (NFOR) or even overtraining syndrome (OTS).

Therefore, scholars such as Ortiz et al. particularly emphasize the importance of monitoring and individualization. The same workout plan may be a perfectly calibrated overload for runner A, yet the straw that breaks the camel’s back for runner B. Factors influencing individual responses include genetics, training history, sleep quality, nutritional status, daily life stress, and even psychological fatigue. This is also why the trend in sports science in recent years has shifted from “standardized plans” to “data-driven individualized adjustments”—dynamically fine-tuning the applied dose of trail climbing energy expenditure through multidimensional data from HRV, resting heart rate, subjective fatigue scales, and performance tests.

From a nutrition and recovery perspective, the benefits of trail climbing energy expenditure also depend heavily on supporting conditions. Adequate carbohydrates ensure sufficient muscle glycogen to fuel high-intensity sessions; sufficient protein (generally recommended at 1.4–1.8 g per kilogram of body weight per day for endurance athletes) supports muscle repair and adaptation; and sleep—the most underestimated recovery tool—is the critical window for integrating and consolidating all molecular adaptation signals. Halson (2014), in a review in Sports Medicine, states plainly that sleep is one of the most important and cheapest recovery tools for endurance athletes. If sleep is chronically insufficient, even the most sophisticated application of trail climbing energy expenditure will yield diminishing returns.

It is also worth noting that the psychological dimension of training cannot be overlooked. The experiment by Marcora and Staiano (2010) in the European Journal of Applied Physiology showed that mental fatigue significantly raises perceived exertion (RPE) at the same intensity and shortens time to exhaustion. This means that even if the physiological system is ready, if a runner is under high psychological stress or low motivation, the training quality of trail climbing energy expenditure will still suffer. Incorporating mental state into training decisions is an important dividing line between “casual running” and “serious race preparation.”

Conclusion: Making Science the Lever for Your Progress

Synthesizing the 4 international empirical studies cited in this article, we can clearly see that trail climbing energy expenditure is not marketing hype but an advanced tool backed by solid physiological and training-science foundations. From the theoretical framework established by Giovanelli et al. to the repeated validation by subsequent studies with quantitative data, its effect sizes and statistical significance are sufficient to support its place in a modern road-running training system.

However, the real key lies not in “knowing” the concept, but in “how to apply it intelligently within Taiwan’s climate, terrain, and race context.” May every Taiwanese runner turn research data into training wisdom and write their own breakthroughs on the riverside paths at dawn, in the humid afternoons, and on the racecourses of winter. Science will not replace effort, but science can ensure that every ounce of your effort is spent where it counts.

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• Training Volume Analysis of Taiwanese Trail Runners: A Study on the Gap with International Trail Running Elites
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