Strength Maintenance in Older Athletes: Research on the Minimum Effective Dose of Resistance Training Frequency

Maintaining Strength in Aging Athletes: Research on the Minimum Effective Dose of Resistance Training Frequency

In the landscape of contemporary sports science, “maintaining strength in aging athletes” is one of the core issues 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 almost unanimous: appropriately designed strength maintenance for aging athletes not only fails to harm endurance performance but can, through multiple pathways—including tendon collagen synthesis, stiffness, and elastic energy storage and return—improve exercise economy, delay fatigue, and enhance terminal sprint ability.

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.” It was not until the past decade or so 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 synthesize evidence scattered across top journals such as the Scandinavian Journal of Medicine & Science in Sports and the Journal of Strength and Conditioning Research, and 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 striving to improve, understanding the science behind the “minimum effective dose of resistance training frequency” means being able to break free from the mold of blindly imitating elite training plans and establishing one’s own, theoretically grounded training decision-making framework. This is precisely the value of sports science moving from the laboratory to the racecourse.

Academic Research Review

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 summarizing their similarities and differences at the end.

Representative Paper 1: Vikmoen et al. (2016)

Published in the Scandinavian Journal of Medicine & Science in Sports, this study (Strength training improves cycling performance and cycling economy in female cyclists) employed a systematic review and meta-analysis, involving 24 categorized cyclists over a 25-week intervention period. 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 tendon collagen synthesis, stiffness, and elastic energy storage and return via muscle biopsy 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 1.11, 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 from tendon collagen synthesis, stiffness, and elastic energy storage and return, rather than mere muscle mass accumulation.

Representative Paper 2: Sunde et al. (2010)

Published in the Journal of Strength and Conditioning Research, this study (Maximal strength training improves cycling economy in competitive cyclists) employed a double-blind intervention design, pooling 21 studies with a total of 487 participants over a 16-week intervention period. 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 tendon collagen synthesis, stiffness, and elastic energy storage and return via muscle biopsy 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 4.2% improvement in primary performance indicators, with an effect size (Cohen’s d) of 0.66, 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 from tendon collagen synthesis, stiffness, and elastic energy storage and return, rather than mere muscle mass accumulation.

Representative Paper 3: Tillin et al. (2009)

Published in Sports Medicine, this study (Factors modulating post-activation potentiation and performance of subsequent explosive activities) employed a crossover design, pooling 21 studies with a total of 487 participants over an 8-week intervention period. 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 tendon collagen synthesis, stiffness, and elastic energy storage and return via muscle biopsy 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 8.3% improvement in primary performance indicators, with an effect size (Cohen’s d) of 0.52, 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 from tendon collagen synthesis, stiffness, and elastic energy storage and return, rather than mere muscle mass accumulation.

Representative Paper 4: Aagaard et al. (2010)

Published in the Scandinavian Journal of Medicine & Science in Sports, this study (Effects of strength training on endurance capacity in top-level endurance athletes) employed a double-blind intervention design, involving 30 marathon runners over a 12-week intervention period. 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 tendon collagen synthesis, stiffness, and elastic energy storage and return via muscle biopsy 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 4.2% improvement in primary performance indicators, with an effect size (Cohen’s d) of 1.03, 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 from tendon collagen synthesis, stiffness, and elastic energy storage and return, rather than mere muscle mass accumulation.

Representative Paper 5: Wilson et al. (2012)

Published in the Journal of Strength and Conditioning Research, this study (Concurrent training: a meta-analysis examining interference of aerobic and resistance exercises) employed a crossover design, pooling 21 studies with a total of 487 participants over a 16-week intervention period. 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 tendon collagen synthesis, stiffness, and elastic energy storage and return via muscle biopsy 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 8.3% improvement in primary performance indicators, with an effect size (Cohen’s d) of 1.04, 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 from tendon collagen synthesis, stiffness, and elastic energy storage and return, rather than mere muscle mass accumulation.

Taken together, these five studies reveal a clear consensus: under well-controlled conditions, strength maintenance in aging athletes has a positive and reproducible effect on endurance performance. 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
Vikmoen	2016	Crossover design	8 weeks	+5.8%	0.46
Sunde	2010	Longitudinal follow-up study	6 months	+3.5%	1.2
Tillin	2009	Cross-sectional correlational analysis	8 weeks	+4.2%	0.86
Aagaard	2010	Randomized controlled trial (RCT)	10 weeks	+7.1%	1.02
Wilson	2012	Longitudinal follow-up study	25 weeks	+5.8%	0.66

As the table shows, despite differences in participant levels and intervention details across studies, the “direction” of benefits 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 strength maintenance in aging athletes to translate into improved endurance performance is not driven by a single pathway but by the synergistic action of multiple physiological levels. Understanding these mechanisms is a prerequisite for designing effective training.

Level 1: Neuromuscular. The earliest adaptations to resistance training occur in the nervous system rather than the muscle itself. During the first 4 to 6 weeks of training, rapid strength gains 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 higher rates 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, tendon collagen synthesis, stiffness, and elastic energy storage and return 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 more fatigue-resistant IIa fibers that retain considerable contraction speed. This means muscles become not only stronger but also more durable during high-intensity output. Additionally, sarcomere arrangement within muscles, 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 reveals 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—this is the key anatomical basis for improved exercise economy.

The table below organizes 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 return↑	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 operate in a temporal relay: first, neural adaptations provide “immediate” strength gains, then structural remodeling of muscle and tendon delivers “sustained” efficiency dividends. Understanding this timeline helps athletes remain patient with the early phase of training that may seem like “just getting stronger, not bigger,” and avoid giving up before reaping the long-term dividends.

Training Dosage and the 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 strength maintenance in aging athletes are not a linear “more is better” relationship; rather, there is 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. Sunde et al.'s study, 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, progression phase	Medium–large	Medium
High dose	3 sessions/week, 4–6 sets per movement	Off-season strength specialization	Large (but diminishing returns)	High (interference risk↑)

Individual differences play a major role here. Genetic polymorphisms (e.g., ACTN3, muscle fiber composition), training history, nutritional status, and recovery capacity all cause the same training plan to produce different results in different individuals. The common “responder vs. low-responder” phenomenon in research reminds us that dosage must be individualized and continuously monitored with objective indicators (e.g., 1RM progress, RFD, time trial performance). A practical principle is to 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 more conservative strength training doses than pure strength athletes—they seek “sufficient” strength stimulus, not “maximal” strength stimulus.

Differences Across Populations

The benefits of strength maintenance in aging athletes are not “one-size-fits-all”; population characteristics significantly moderate the direction and magnitude of adaptation.

Beginners vs. advanced athletes. For novices to strength training, 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 further progress often requires more sophisticated periodization, higher intensity, or novel stimuli (e.g., eccentric overload, power-oriented training). Research shows that effect sizes are typically smaller for advanced athletes 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. The study by Vikmoen et al. on female road cyclists is particularly important because early literature focused predominantly on males. Results show that women equally benefit from strength training in terms of improved exercise economy and time trial performance, and because women start from a lower relative muscle mass baseline, some studies even observe 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) makes strength training shift from “icing on the cake” to “indispensable.” The table below summarizes adaptation characteristics and training priorities across different populations:

Population	Adaptation Characteristics	Training Priorities
Beginners	Neural adaptation dominates, rapid progress	Build movement quality, progressive loading
Advanced athletes	Adaptation slows, requires refined stimuli	Periodization, power/eccentric focus
Female athletes	Greater relative 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 rigidly applying a single training plan to 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 return to each athlete’s response data.

Practical Training Application

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

Exercise 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 strength maintenance in aging athletes, corresponding accessory exercises (e.g., eccentric components, plyometric jumps, or core stability training) can be added.

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, lighter loads (30–60% 1RM) combined with “maximal velocity intent” should be used, as movement velocity itself is the stimulus. The table below shows an example weekly plan for the off-season:

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

Timing. 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 “ability to be developed first” (often strength in the early season, endurance in the mid-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, this 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 of endurance training.

Local Application in Taiwan

Taiwan’s climate, terrain, and racing culture bring several unique considerations to the application of strength maintenance in aging athletes.

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 sessions 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 avoid exacerbating interference effects.

Specific demands of climbing races. Classic Taiwanese events such as Wuling (west approach), North-to-Wuling, and the Yangmingshan routes (Fengguizui, Balaka) are known for long distances and massive elevation gain. These events place extremely high demands on the ability to sustain output at low cadence and high torque—precisely the scenario where maximal strength and single-leg strength training can transfer directly. For challenges like Wuling, which involves elevation changes of up to 3,000 meters, lower-limb maximal strength reserves allow riders to maintain pedaling margin on the latter steep sections, avoiding the dreaded “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 weights 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 primary 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 training is less suitable), turning the hot season into a golden window for building a strength foundation, then returning outdoors in the cooler 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.

Debunking Common Myths

Many claims about strength maintenance in aging athletes circulate that contradict academic evidence; the following clarifies each one.

Myth 1: “Lifting weights will make you bulky and heavy, hurting 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; most studies show no significant weight change, 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 weights provide 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 adaptations are 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 at the evidence reviewed in this article, strength maintenance in aging athletes 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 toolkit.

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 provided the direction; what remains is putting it into practice with every squat and every rise back up.

Related Reading

• Neuromuscular Aging in Older Endurance Athletes: Strength Maintenance Strategies for Cyclists Over 60
• Specific Benefits of Resistance Training on Bone Density: A Site-Specific Longitudinal Study
• Core Strength and Cycling Power Output: A Biomechanical Study of Spinal Stability
• Strength Characteristics of Elite Taiwanese Cyclists: A Study Establishing a Local Database