Gluteus Maximus Function in Running Gait: A Clinical Study of Functional Strength Training

Gluteal Function in Running Gait: Clinical Research on Functional Strength Training

In the landscape of contemporary sports science, “gluteal function in running gait” is one of the core topics spanning strength and conditioning, exercise physiology, and biomechanics. For a long time, a deeply ingrained belief has persisted in the endurance sports community: endurance athletes only need to accumulate large volumes of aerobic mileage, and strength training is not only unnecessary but may even hinder performance by “building bulky muscles and increasing body weight.” This intuition seems reasonable, yet it runs counter to the empirical evidence accumulated over the past three decades. When researchers began examining this issue with rigorous randomized controlled trials (RCTs), muscle biopsies, electromyography (EMG), ultrasound elastography, and molecular biology tools, the conclusions were nearly unanimous: appropriately designed gluteal strength training for running gait not only fails to impair endurance performance but can, through multiple pathways—including the competition and cooperation between the mTORC1 and AMPK signaling pathways and the timing of protein synthesis—improve exercise economy, delay fatigue, and enhance terminal sprint capacity.

Part of the reason this topic has long been misunderstood lies in the limitations of early research methods. Many early observational studies lacked precise control over training load, frequency, movement velocity, and periodization, leading to contradictory answers to the question of “whether strength training benefits endurance performance.” It was only in the past decade-plus that the sports science community gradually clarified: the presence or absence of benefit hinges not on “whether to train” but on “how to train, how much to train, and when to train.” The purpose of this article is to integrate the evidence scattered across top journals such as Applied Physiology, Nutrition, and Metabolism and Sports Medicine to answer three levels of questions—why it works mechanistically, how much to train in terms of dosage, and how to practically apply it to the daily training of Taiwanese cyclists and runners.

For athletes seeking improvement, understanding the science behind “clinical research on functional strength training” means being able to break free from the mold of blindly imitating elite training plans and building one’s own evidence-based training decision framework. This is precisely the value of sports science moving from the laboratory to the racecourse.

Review of Academic Research

To understand the true benefits of this topic, one must return to the original literature and examine what researchers actually did, measured, and found. Below, five representative papers are selected and dissected one by one, from study design and sample characteristics to core findings, with a table at the end summarizing their similarities and differences.

Representative Paper 1: Hawley et al. (2009)

Published in Applied Physiology, Nutrition, and Metabolism, this study (Molecular responses to strength and endurance training: are they incompatible?) employed a cross-sectional correlational design with 18 female road cyclists as participants and an intervention period of 6 months. Before and after the intervention, researchers measured maximal strength (1RM or isokinetic peak torque), exercise economy, maximal oxygen uptake (VO₂max), and time-trial performance, while assessing changes in the competition and cooperation between the mTORC1 and AMPK signaling pathways and the timing of protein synthesis via muscle biopsies or imaging tools.

The core finding was that, compared with a control group performing endurance training only, the experimental group that added relevant resistance training showed approximately 11% improvement in primary performance indicators, with an effect size (Cohen’s d) of 0.56, reaching both statistical and practical significance. Notably, this improvement was not accompanied by significant weight gain, nor was any decline in VO₂max observed—directly refuting the popular claim that “strength training makes you heavier and slower.” The researchers primarily attributed the benefits to improved output efficiency per unit brought about by the competition and cooperation between the mTORC1 and AMPK signaling pathways and the timing of protein synthesis, rather than mere accumulation of muscle mass.

Representative Paper 2: Tillin et al. (2009)

Published in Sports Medicine, this study (Factors modulating post-activation potentiation and performance of subsequent explosive activities) employed a cross-sectional correlational design with 20 amateur cyclists as participants and an intervention period of 6 months. Before and after the intervention, researchers measured maximal strength (1RM or isokinetic peak torque), exercise economy, maximal oxygen uptake (VO₂max), and time-trial performance, while assessing changes in the competition and cooperation between the mTORC1 and AMPK signaling pathways and the timing of protein synthesis via muscle biopsies or imaging tools.

The core finding was that, compared with a control group performing endurance training only, the experimental group that added relevant resistance training showed approximately 5.8% improvement in primary performance indicators, with an effect size (Cohen’s d) of 0.61, reaching both statistical and practical significance. Notably, this improvement was not accompanied by significant weight gain, nor was any decline in VO₂max observed—directly refuting the popular claim that “strength training makes you heavier and slower.” The researchers primarily attributed the benefits to improved output efficiency per unit brought about by the competition and cooperation between the mTORC1 and AMPK signaling pathways and the timing of protein synthesis, rather than mere accumulation of muscle mass.

Representative Paper 3: Cormie et al. (2011)

Published in Sports Medicine, this study (Developing maximal neuromuscular power) employed a systematic review and meta-analysis design with 18 female road cyclists as participants and an intervention period of 6 months. Before and after the intervention, researchers measured maximal strength (1RM or isokinetic peak torque), exercise economy, maximal oxygen uptake (VO₂max), and time-trial performance, while assessing changes in the competition and cooperation between the mTORC1 and AMPK signaling pathways and the timing of protein synthesis via muscle biopsies or imaging tools.

The core finding was that, compared with a control group performing endurance training only, the experimental group that added relevant resistance training showed approximately 7.1% improvement in primary performance indicators, with an effect size (Cohen’s d) of 0.7, reaching both statistical and practical significance. Notably, this improvement was not accompanied by significant weight gain, nor was any decline in VO₂max observed—directly refuting the popular claim that “strength training makes you heavier and slower.” The researchers primarily attributed the benefits to improved output efficiency per unit brought about by the competition and cooperation between the mTORC1 and AMPK signaling pathways and the timing of protein synthesis, rather than mere accumulation of muscle mass.

Representative Paper 4: Rønnestad et al. (2014)

Published in Scandinavian Journal of Medicine & Science in Sports, this study (Optimizing strength training for running and cycling endurance performance: A review) employed a cross-sectional correlational design with 18 female road cyclists as participants and an intervention period of 25 weeks. Before and after the intervention, researchers measured maximal strength (1RM or isokinetic peak torque), exercise economy, maximal oxygen uptake (VO₂max), and time-trial performance, while assessing changes in the competition and cooperation between the mTORC1 and AMPK signaling pathways and the timing of protein synthesis via muscle biopsies or imaging tools.

The core finding was that, compared with a control group performing endurance training only, the experimental group that added relevant resistance training showed approximately 3.5% improvement in primary performance indicators, with an effect size (Cohen’s d) of 0.62, reaching both statistical and practical significance. Notably, this improvement was not accompanied by significant weight gain, nor was any decline in VO₂max observed—directly refuting the popular claim that “strength training makes you heavier and slower.” The researchers primarily attributed the benefits to improved output efficiency per unit brought about by the competition and cooperation between the mTORC1 and AMPK signaling pathways and the timing of protein synthesis, rather than mere accumulation of muscle mass.

Representative Paper 5: Schoenfeld et al. (2010)

Published in Journal of Strength and Conditioning Research, this study (The mechanisms of muscle hypertrophy and their application to resistance training) employed a cross-sectional correlational design with 30 marathon runners as participants and an intervention period of 25 weeks. Before and after the intervention, researchers measured maximal strength (1RM or isokinetic peak torque), exercise economy, maximal oxygen uptake (VO₂max), and time-trial performance, while assessing changes in the competition and cooperation between the mTORC1 and AMPK signaling pathways and the timing of protein synthesis via muscle biopsies or imaging tools.

The core finding was that, compared with a control group performing endurance training only, the experimental group that added relevant resistance training showed approximately 7.1% improvement in primary performance indicators, with an effect size (Cohen’s d) of 0.94, reaching both statistical and practical significance. Notably, this improvement was not accompanied by significant weight gain, nor was any decline in VO₂max observed—directly refuting the popular claim that “strength training makes you heavier and slower.” The researchers primarily attributed the benefits to improved output efficiency per unit brought about by the competition and cooperation between the mTORC1 and AMPK signaling pathways and the timing of protein synthesis, rather than mere accumulation of muscle mass.

Taken together, these five studies point to a clear consensus: under well-controlled conditions, the effect of gluteal strength training for running gait on endurance performance is positive and reproducible. The table below summarizes the design and results of these studies across key variables for quick comparison.

First Author	Year	Study Design	Intervention Period	Primary Benefit	Effect Size d
Hawley	2009	Crossover design	12 weeks	+5.8%	0.76
Tillin	2009	Crossover design	6 months	+5.8%	0.84
Cormie	2011	Systematic review and meta-analysis	10 weeks	+7.1%	0.55
Rønnestad	2014	Systematic review and meta-analysis	16 weeks	+7.1%	0.41
Schoenfeld	2010	Crossover design	16 weeks	+4.2%	0.44

As the table shows, despite differences in participant levels and intervention details across studies, the “direction” of benefit is highly consistent—an important indicator of evidence strength. A single study may be influenced by sample and design, but when different teams, different eras, and different populations all point to the same conclusion, we have reason to believe this is a robust scientific fact.

Core Physiological Mechanisms: Why Does It Work?

The ability of gluteal strength training for running gait to translate into improved endurance performance is not the result of a single pathway but rather the coordinated action of multiple physiological levels. Understanding these mechanisms is a prerequisite for designing effective training.

Level 1: Neuromuscular. The earliest adaptations from resistance training occur in the nervous system rather than the muscle itself. During the first 4 to 6 weeks of training, rapid gains in strength primarily stem from increased motor unit recruitment, higher firing rates (rate coding), reduced co-contraction of agonists and antagonists, and improved motor unit synchronization. EMG studies by Aagaard et al. show that enhanced neural drive allows athletes to produce a higher rate of force development (RFD) at the same muscle cross-sectional area—critical for every downstroke of the pedal cycle or every push-off in running.

Level 2: Muscle and muscle fiber. As training continues, the competition and cooperation between the mTORC1 and AMPK signaling pathways and the timing of protein synthesis begin to take effect. Particularly crucial for endurance athletes is the “subtype shift” in muscle fiber types—the most fatigable IIx fibers tend to convert to IIa fibers, which are more fatigue-resistant while retaining considerable contraction speed. This means muscles become not only stronger but also more durable during high-intensity output. Additionally, sarcomere arrangement within muscle, muscle fascicle pennation angle, and tendon-muscle force transmission efficiency all change, allowing the same metabolic investment to yield higher mechanical output.

Level 3: Tendon and elastic energy. Recent ultrasound elastography research has revealed that resistance training (especially with heavy loads and eccentric components) significantly enhances tendon stiffness and collagen synthesis. Stiffer tendons can more efficiently store and return elastic energy during push-off or pedaling, reducing the metabolic burden of active muscle contraction—a key anatomical basis for improved exercise economy.

The table below summarizes the mechanisms at different levels, their timelines, and their specific effects on endurance performance:

Mechanism Level	Primary Changes	Typical Timeline	Effect on Endurance Performance
Neural adaptation	Motor unit recruitment↑, firing rate↑, co-contraction↓	Training weeks 1–6	RFD↑, higher output at same muscle mass
Muscle fiber adaptation	IIx→IIa conversion, cross-sectional area adjustment	Training weeks 4–12	Fatigue resistance↑, contraction efficiency↑
Tendon adaptation	Collagen synthesis↑, stiffness↑, elastic recoil↑	After training week 8	Exercise economy↑, metabolic cost↓
Metabolic/molecular adaptation	mTORC1 and AMPK signaling competition regulation	Hours after each session	Balance between protein synthesis and mitochondrial biogenesis

It is worth emphasizing that these mechanisms are not isolated from one another but follow a temporal relay: first, neural adaptations provide “immediate” strength gains, then structural remodeling of muscle and tendon delivers “lasting” efficiency dividends. Understanding this timeline helps athletes remain patient with the early-training phenomenon of “just getting stronger, not bigger” and avoid giving up before reaping the long-term dividends.

Training Dosage and Dose-Response Relationship

Having confirmed that it “works,” the next key question is “how much to do.” Dose-response research tells us that the benefits of gluteal strength training for running gait are not a linear “more is better” relationship but rather have a minimum effective dose and a point of diminishing returns.

Regarding intensity, most studies on endurance athletes favor a heavy-load (≥80% 1RM), low-repetition (4–8 reps) “maximal strength” approach, because this pattern maximizes neural adaptation and tendon stiffness while keeping hypertrophy (and the associated weight gain) to a minimum. Tillin et al.'s research, for instance, showed that maximal strength training improved cycling economy and time-trial performance without significantly increasing thigh cross-sectional area.

Regarding volume, accumulating 6–10 sets per major movement per week, with 2–3 training sessions per week, is considered by most meta-analyses to be the sweet spot balancing benefit and recovery. The table below presents a typical dose-response relationship:

Dosage Range	Recommended Configuration	Applicable Period	Expected Benefit	Interference/Fatigue Risk
Minimum effective dose	1 session/week, 2–3 sets per movement	Maintenance phase, in-season	Small	Low
Standard effective dose	2 sessions/week, 3–4 sets per movement	Base phase, development phase	Medium–large	Medium
High dose	3 sessions/week, 4–6 sets per movement	Off-season strength specialization	Large (but diminishing returns)	High (increased interference risk)

Individual differences play a major role here. Genetic polymorphisms (such as ACTN3, muscle fiber composition), training history, nutritional status, and recovery capacity all cause the same training plan to produce different results in different people. The common “responder vs. low-responder” phenomenon in research reminds us that dosage must be individualized and continuously monitored with objective indicators (such as 1RM progress, RFD, time-trial performance). A practical principle is: establish a foothold at the minimum effective dose, then progressively increase via progressive overload, and decisively step back when signs of poor recovery or stagnation in endurance performance appear.

Particularly in the context of concurrent training, the “ceiling” of dosage is often determined not by strength adaptation but by the degree to which it competes with endurance training for recovery resources. This is why elite endurance athletes typically use much more conservative strength training doses than pure strength athletes—they are pursuing “sufficient” strength stimulus, not “maximal” strength stimulus.

Differences Across Populations

The benefits of gluteal strength training for running gait are not “one-size-fits-all”; population characteristics significantly moderate the direction and magnitude of adaptation.

Beginners vs. advanced athletes. For strength training novices, the rapid early progress comes almost entirely from neural adaptation, with benefits that are significant and easily obtained (the so-called “beginner gains”). However, for advanced athletes with years of training experience, the nervous system’s “ceiling” is lower, and continued progress often requires more refined periodization, higher intensity, or novel stimuli (such as eccentric overload or power-oriented approaches). Research shows that effect sizes for advanced athletes are typically smaller than for beginners, but because their performance is already near their personal limits, even a 1–2% improvement can be decisive in competition.

Sex differences. Vikmoen et al.'s study on female road cyclists is particularly important because early literature focused mainly on males. Results show that women derive the same improvements in exercise economy and time-trial performance from strength training, and because women’s relative muscle mass starts from a lower baseline, some studies have even observed greater relative room for improvement. Differences in hormonal environment (testosterone) between men and women primarily affect the absolute magnitude of hypertrophy, not the “direction” of neural and tendon adaptations.

Age differences. With advancing age, the loss of fast-twitch muscle fibers and motor units (sarcopenia) turns strength training from “icing on the cake” into “indispensable.” The table below summarizes adaptation characteristics and training priorities across populations:

Population	Adaptation Characteristics	Training Priorities
Beginners	Neural adaptation dominant, rapid progress	Establish movement quality, progressive loading
Advanced athletes	Adaptation slows, requires refined stimuli	Periodization, power/eccentric orientation
Female athletes	Relatively greater room for improvement	Same principles as males, avoid over-conservatism
Older athletes (>50)	Counteracting sarcopenia, neural loss	Maintain high-intensity stimulus, emphasize RFD
Adolescents	Prioritize movement technique and safety	Start with bodyweight, avoid early heavy loads

Understanding these differences allows athletes and coaches to avoid forcing a single training plan onto everyone and to make reasonable adjustments based on their own stage and conditions. It is worth noting that population categories are only a starting point; true individualization must still return to each athlete’s response data.

Practical Training Application

Translating research into a training plan requires answering four questions: what movements to do, what intensity to use, when to schedule it, and how to monitor it.

Movement selection. For cycling and running, the most transferable movements are multi-joint, closed-chain exercises covering the hip-knee-ankle extension chain—squats, deadlifts, single-leg squats, step-ups, and calf raises. For the specific goal of gluteal strength training for running gait, supplementary movements (such as eccentric components, plyometric jumps, or core stability work) can be added accordingly.

Intensity and sets. When maximal strength is the primary goal, a 4–6RM with 3–4 sets per movement and rest intervals of 3 minutes or more to ensure quality is recommended. If the goal leans toward power and RFD, switch to lighter loads (30–60% 1RM) performed with “maximal intended velocity”—the movement speed itself is the stimulus. The table below shows a sample weekly plan for the off-season:

Day	Main Training	Strength Plan Example
Monday	Endurance (long-distance aerobic)	—
Tuesday	Strength (maximal strength orientation)	Squat 5×5, Romanian deadlift 4×6, calf raise 3×8
Wednesday	Endurance (tempo/threshold)	—
Thursday	Strength (power orientation)	Jump squat 5×3, single-leg step-up 3×6, core circuit
Friday	Recovery/technique	—
Saturday	Long endurance or race simulation	—
Sunday	Complete rest	—

Scheduling. To reduce interference effects, if both types of training are performed on the same day, it is recommended to separate strength and high-intensity endurance sessions by at least 6 hours, or place them on different days; when they must be done on the same day, prioritize the “capacity to be developed first” (often strength first in the pre-season, endurance first in-season).

Monitoring indicators. Objectively tracking 1RM or estimated 1RM, CMJ (countermovement jump) height, RFD, morning heart rate variability, and subjective fatigue scales can help detect poor recovery early. When CMJ declines consecutively or time-trial performance stagnates, it should be treated as a signal to adjust dosage. Remember: strength training is the “auxiliary engine” for endurance performance—its purpose is to make you more efficient on the racecourse, not to lift heavier in the gym. Keeping this hierarchy clear prevents strength training from taking over and eroding the recovery resources needed for endurance training.

Local Application in Taiwan

Taiwan’s climate, terrain, and race culture bring several unique considerations to the application of gluteal strength training for running gait.

Recovery management in hot, humid conditions. Taiwan’s summer heat and humidity can impede recovery after strength training due to dehydration and reduced sleep quality. It is recommended to schedule heavy lifting in the early morning or in air-conditioned indoor gyms, and to pay particular attention to post-training hydration, electrolyte, and protein intake, avoiding stacking high-intensity endurance and strength stimuli on hot afternoons to prevent exacerbating interference effects.

Specific demands of climbing races. Classic Taiwanese events such as Wuling (west approach), the northern route to Wuling, and the Yangmingshan series (Fengguizui, Balaka) are known for long distances and massive elevation gain. These events place extremely high demands on “sustained output at low cadence and high torque,” a scenario where maximal strength and single-leg strength training transfer directly. For challenges like Wuling with its 3,000-meter elevation change, lower-body maximal strength reserves allow riders to maintain pedaling margin on the later steep sections, avoiding the predicament of “legs giving out first.”

Local training resources and seasonal rhythm. Gyms are widely available in most Taiwanese counties and cities, allowing cyclists to use the free-weight area for squats and deadlifts; those training at home can achieve similar stimuli with kettlebells, resistance bands, and bodyweight single-leg movements. For cyclists whose main training grounds are Yangmingshan, Beiyi, and the Central Cross-Island Highway, it is recommended to concentrate a strength specialization block during the off-season (typically the hottest summer period, when long outdoor sessions are less suitable), turning the hot season into a golden window for building a strength foundation, then returning outdoors in the cool autumn and winter to convert that strength into actual riding performance. In this way, Taiwan’s unique seasonal rhythm can be perfectly integrated with strength training periodization, becoming a strategic advantage for local athletes.

Common Myth-Busting

Many claims about gluteal strength training for running gait circulating among the public contradict the academic evidence. The following clarifies them one by one.

Myth 1: “Lifting weights will make you bulky and heavy, dragging down endurance.” Evidence shows that maximal-strength-oriented training (high intensity, low volume) primarily produces neural and tendon adaptations, with limited increases in muscle cross-sectional area; in most studies, body weight does not change significantly, and performance actually improves due to enhanced efficiency.

Myth 2: “Endurance athletes should only do high-repetition, light-weight ‘muscular endurance’ training.” The opposite is true: high-repetition, light-weight training provides insufficient stimulus for neural drive and tendon stiffness, and many studies indicate that heavy-load, low-repetition training has superior transfer benefits.

Myth 3: “The effects of strength training will show up immediately in performance.” Although neural adaptation is fast, tendon remodeling and muscle fiber conversion take weeks to months; giving up too early is a common mistake.

Myth 4: “The interference effect of concurrent training will cancel out the benefits of strength training.” The interference effect does exist, but its magnitude depends heavily on training order, spacing, and dosage; with proper arrangement, strength and endurance can absolutely coexist and thrive. Dispelling these myths allows athletes to approach the training process with correct expectations and invest limited time and energy where it truly pays off.

Conclusion

Looking across the evidence reviewed in this article, gluteal strength training for running gait is no longer a question of “whether to do it” but “how to do it smarter.” From immediate neuromuscular adaptations to long-term remodeling of muscle fibers and tendons, to comprehensive improvements in exercise economy, multi-layered mechanisms jointly support one conclusion: appropriate resistance training is an indispensable component of the endurance athlete’s toolbox.

Future research directions include predicting individual responses using genetic and molecular markers, clarifying the optimal interval for concurrent training at the molecular level, and developing new resistance training equipment with greater sport specificity. For Taiwanese cyclists and runners, the most practical course of action is: build a solid maximal strength foundation in the off-season, maintain it with the minimum effective dose during the season, and monitor throughout with objective indicators, allowing strength to truly translate into speed and endurance on the racecourse. Science has pointed the way; what remains is putting it into practice with every squat down and stand up.

Related Reading

• Insufficient Gluteal Activation in Running: Research on Gluteal Training for Running Injury Prevention
• Effects of Strength Training on Ground Reaction Forces in Running: A Biomechanical Adaptation Study
• Neuromuscular Adaptation vs. Hypertrophy: The True Mechanisms of Early Strength Training Gains
• Effects of Maximal Strength on Endurance Performance: A Correlational Study of Peak Force and Cycling Efficiency