Analysis of Injury Types Among Taiwanese Cyclists: A Prospective Epidemiological Study of 107 Athletes

Cycling-related sports injuries (cycling injuries) are among the clinically highly concerning sports injuries in the endurance and competitive athletic population, with lesions primarily located across multiple body sites. Epidemiological studies indicate that the incidence of such injuries in the active athletic population is not negligible and is closely related to training load, biomechanical alignment, and individual recovery capacity. According to pooled data from BJSM and AJSM over the past decade, overuse injuries account for approximately 60–70% of endurance sports injuries, and cycling injuries are a recurring representative among them. Research indicates that the incidence varies significantly by sex, age, and sport discipline, highlighting the importance of individualized assessment.

In Taiwan, with the flourishing national sports culture and the rapid growth of marathon, cycling, and triathlon events, outpatient visits for cycling injuries have increased year by year. Urban athletes often train at high frequency on hard surfaces, and the subtropical hot and humid climate leads to premature fatigue and insufficient recovery, making repetitive loading across multiple body sites an important issue in local sports medicine. This article provides an in-depth analysis covering injury mechanisms, diagnostic assessment, treatment comparisons, progressive rehabilitation, prevention strategies, and local applications in Taiwan, integrating the latest academic evidence to help readers establish a scientific understanding.

Injury Mechanism Analysis

The core pathological mechanism of cycling injuries can be summarized as a “dual-track mechanism of overuse and fall-related trauma.” From a biomechanical perspective, multiple body sites endure repetitive and peak mechanical loads during exercise. When the intensity of a single load or the cumulative load volume exceeds the tissue’s repair capacity, microdamage gradually accumulates and ultimately surpasses the tissue tolerance threshold, resulting in clinically visible injury. This “load–capacity imbalance” model has become the core framework for understanding overuse injuries in modern sports medicine.

Clarsen B et al. (2010). BJSM research using imaging and biomechanical analysis revealed that an imbalance in any link of the kinetic chain alters the load distribution across multiple body sites. Proximal control deficits (e.g., poor hip and trunk stability) or distal alignment abnormalities (e.g., excessive foot pronation) can transmit forces mechanically, subjecting target tissues to non-physiological shear and compressive stress. This “malalignment cascade” concept emphasizes that pain at a single site is often the terminal manifestation of dysfunction throughout the entire kinetic chain.

At the anatomical and tissue level, De Bernardo N et al. (2012). J Sports Sci further pointed out that repetitive loading induces the release of local inflammatory mediators, disorganization of collagen fiber alignment, and, in the chronic phase, the co-ingrowth of blood vessels and nerves (neovascularization), which explains why chronic lesions present primarily with pain rather than typical inflammatory manifestations. Histological studies show that the essence of chronic overuse lesions is “degeneration” rather than simple “inflammation.” This conceptual shift directly influences treatment strategies—moving from anti-inflammatory approaches toward progressive loading that promotes tissue remodeling.

The role of neuromuscular control cannot be overlooked. Silberman MR (2013). Curr Sports Med Rep confirmed through electromyography and motion analysis that injured individuals often exhibit altered muscle activation timing, increased co-contraction of antagonist muscles, and delayed proprioceptive feedback. These maladaptive neural changes reduce dynamic stability during movement, creating a vicious cycle of “injury—worsening control—re-injury.” Furthermore, fatigue amplifies these deficits: when muscles fatigue, their shock-absorbing capacity declines, and loads are shifted to passive structures (bone, ligaments, tendon attachment sites), accelerating microdamage accumulation.

In summary, cycling injuries are not a single-factor disease but rather the result of the interaction of multiple factors: “training load, biomechanical alignment, neuromuscular control, tissue repair capacity, and psychosocial stress.” Understanding this multifactorial model is a prerequisite for subsequent accurate diagnosis and effective intervention.

Diagnostic and Assessment Methods

The diagnosis of cycling injuries should be based on the triangulation of a comprehensive history, systematic physical examination, and appropriate imaging confirmation. History-taking must clarify the onset and timing of pain, its relationship to training load, aggravating and relieving factors, and previous injury history. Typical overuse injuries present with a “progressive, activity-related” pain pattern, whereas sudden severe pain warrants vigilance for acute structural damage or stress fractures.

In terms of physical examination, clinicians should perform local palpation to localize tender points, assess joint range of motion, muscle strength, and flexibility, and conduct targeted provocation tests to reproduce symptoms. Dynamic assessments such as single-leg squats, jump landings, and running gait analysis can reveal dynamic alignment abnormalities (e.g., dynamic valgus, pelvic drop) that static examinations cannot detect. Clarsen B et al. (2010). BJSM and Dettori NJ & Norvell DC (2006). Sports Med both emphasize that the diagnostic validity of a single test is limited; multiple tests combined with functional performance are necessary to improve diagnostic accuracy and reduce misdiagnosis rates.

The choice of imaging modality should be guided by the clinical question, avoiding over-investigation. The following table summarizes the characteristics of commonly used imaging and assessment tools:

Imaging/Assessment Tool	Primary Use	Sensitivity Overview	Clinical Notes
Plain X-ray	Exclude fractures, calcifications, and bony structural abnormalities	Low for early soft tissue pathology	First-line screening, low cost
Ultrasound (US)	Real-time assessment of cycling injury tendons and soft tissues; allows dynamic testing	High for superficial lesions	Operator-dependent; can guide injections
Magnetic Resonance Imaging (MRI)	Evaluate soft tissues, bone marrow edema, and occult pathology	High for both bone and soft tissue	Expensive; gold standard for complex cases
Bone scan	Detect bone metabolic activity and early bone response	Sensitive for bone response, low specificity	Increasingly replaced by MRI

Image interpretation must adhere to the “clinical–imaging concordance principle”: abnormal signals on imaging are not necessarily the source of symptoms, and tendon degeneration or cartilage changes are commonly seen in asymptomatic individuals. De Bernardo N et al. (2012). J Sports Sci cautions that over-reliance on imaging may lead to unnecessary interventions and patient anxiety. Therefore, the ultimate goal of assessment is not merely to name the lesion but to identify correctable load sources and functional deficits, and to formulate individualized treatment and rehabilitation plans accordingly. Grading systems (e.g., based on symptom severity or imaging stage) can aid in prognosis and return-to-play timeline planning.

Comparison of Treatment Options

Treatment for cycling injuries should follow a stepwise principle of “conservative first, invasive second.” Exercise therapy is the core first-line approach, supplemented by pain management and activity modification; invasive treatments are reserved for cases where conservative treatment has failed or structural damage is clearly defined. In recent years, high-quality RCTs consistently support progressive loading exercise as the most effective intervention for most overuse injuries. The systematic review by Clarsen B et al. (2010). BJSM showed that functional, progressive-loading-based exercise programs are superior to passive treatments in terms of pain and functional improvement, with long-term maintenance of effects.

The following table compares the mechanisms, evidence levels, and indications of major treatment options:

Treatment Option	Mechanism of Action	Evidence Level	Indications
Exercise therapy (progressive loading)	Promotes tissue adaptation, restores strength and control	High (supported by multiple RCTs)	First choice at all stages; long-term cornerstone
Manual therapy	Short-term pain relief, improves joint mobility	Moderate	Adjunct in the acute phase
Extracorporeal Shock Wave Therapy (ESWT)	Mechanotransduction promoting vascular and cellular repair	Moderate	Chronic refractory lesions
Injection therapy (PRP/corticosteroids)	Growth factors or anti-inflammatory effects	Low to moderate, controversial	Cautious use after conservative failure
Surgery	Repair or decompress structural lesions	Depends on the lesion	Failure of conservative treatment for 3–6 months or structural damage

Regarding injection therapy, Silberman MR (2013). Curr Sports Med Rep and related meta-analyses present divergent results: corticosteroid injections provide short-term pain relief but may be detrimental to tissue healing in the medium to long term and may even increase recurrence; evidence for platelet-rich plasma (PRP) is highly heterogeneous, with some studies showing benefit for specific tendinopathies, but overall efficacy still awaits confirmation by more rigorous trials. Extracorporeal shock wave therapy (ESWT) shows moderate evidence for chronic refractory lesions and can be an option when conservative treatment plateaus.

Surgery is indicated only for clear structural damage (e.g., complete tears, unstable osteochondral lesions) or when long-term conservative treatment has failed. Dettori NJ & Norvell DC (2006). Sports Med noted that even for lesions traditionally inclined toward surgery, an increasing number of long-term follow-up studies show that structured conservative treatment can achieve functional outcomes comparable to surgery while avoiding surgical risks. Therefore, shared decision-making is particularly important in treatment selection, taking into account athletic demands, timelines, and individual preferences.

Progressive Rehabilitation Protocol

Rehabilitation for cycling injuries should be based on the core principle of “progressive loading under pain monitoring.” Clinically, a 0–10 numerical pain rating scale is commonly used, allowing pain no greater than 3/10 during exercise and within 24 hours after exercise, with no worsening of morning stiffness, as an indicator for safe progression. Rehabilitation is typically divided into four phases, and each phase must meet clear criteria-based progression standards before advancing, rather than relying solely on time.

The following is the phased rehabilitation framework:

Phase	Goal	Representative Interventions	Progression Criteria
Phase 1: Pain control and protection	Reduce irritation, maintain baseline mobility	Relative rest, isometric contractions, activity modification	No significant pain during daily activities
Phase 2: Restore strength and mobility	Rebuild strength, endurance, and joint control	Progressive resistance training, eccentric training, proximal strengthening	Affected side strength ≥80% of the healthy side
Phase 3: Functional and sport-specific strengthening	Restore power, elasticity, and movement quality	Plyometric training, single-leg stability, running form re-education	Good symmetry on functional tests, no pain
Phase 4: Return to sport and re-injury prevention	Gradually return to sport-specific training volume	Progressive return to running/cycling volume, load monitoring	Pass return-to-sport testing, tolerable load

Phase 1 emphasizes “relative rest” rather than complete immobilization—complete inactivity accelerates muscle atrophy and tissue deconditioning. Isometric contractions have been shown to provide immediate analgesia and maintain strength in many tendinopathies. Phase 2 introduces progressive resistance and eccentric training to promote collagen remodeling and strengthening of the muscle–tendon unit. Phase 3 adds plyometric and sport-specific movements to rebuild tissue tolerance to high-speed, high-impact loads. Phase 4 uses quantified load monitoring (e.g., weekly training volume changes, acute:chronic workload ratio) to ensure a smooth return process and avoid recurrence from overzealous progression. The entire process should be individualized, with regular tracking of outcomes using objective indicators (strength, jump tests, movement quality).

Prevention Training Strategies

The key to preventing cycling injuries lies in two pillars: “managing training load” and “enhancing biomechanical resilience.” In terms of training load management, avoiding sudden increases in weekly training volume is the foremost principle. Research generally recommends that weekly training volume increases should not exceed approximately 10%, and the acute:chronic workload ratio (ACWR) can be used to maintain a relatively safe range, balancing adaptation and risk control. Overtraining and insufficient recovery impair tissue repair capacity and are common upstream factors in numerous overuse injuries.

Building biomechanical resilience requires addressing the entire kinetic chain. The following are specific, evidence-oriented preventive exercise directions:

1. Proximal stabilization strengthening: Strengthen hip abductors, hip extensors, and trunk core muscles to improve dynamic alignment and reduce compensatory loading; this is a common foundation for preventing lower extremity overuse injuries.
2. Eccentric and progressive resistance training: Eccentric loading has been shown to enhance tendon and muscle tolerance and is particularly effective for preventing muscle and tendon pathologies.
3. Movement quality re-education: Improve running form (e.g., moderately increasing cadence, avoiding excessive stride length) and cycling posture (appropriate saddle and handlebar configuration) to reduce peak loads per repetition.
4. Flexibility and mobility maintenance: Perform dynamic stretching and mobility training for key tight muscle groups to ensure smooth force transmission.
5. Progressive adaptation and periodization: Periodize training with deload weeks interspersed to allow adequate tissue repair and supercompensation.

It is worth emphasizing that prevention programs must have adherence to be effective. Integrating preventive exercises into daily warm-ups or strength sessions and presenting them in simple, executable formats is a practical key to improving long-term compliance. Coaches and athletes should establish a culture of “listening to body signals,” treating minor discomfort as an early warning to adjust training rather than ignoring it or pushing through.

Local Applications in Taiwan

Taiwan’s geography, climate, and event environment have unique influences on the occurrence and management of cycling injuries. Climatologically, Taiwan’s summer is hot and humid, with rapid rises in core body temperature and high dehydration risk during exercise. Premature fatigue leads to decreased neuromuscular control, indirectly increasing the risk of injuries across multiple body sites. It is recommended that local athletes train in the early morning or evening, pay attention to hydration and electrolyte intake, and proactively reduce training intensity and volume on hot days.

Regarding venues, urban athletes often train on riverside bike paths, PU tracks, and hard asphalt surfaces. Unidirectional loop tracks can cause uneven unilateral loading; alternating directions is recommended. For prolonged hard-surface training, appropriate footwear and gradually accumulated mileage should be paired. Taiwan’s mountainous terrain (e.g., Yangmingshan, Wuling, Beihuang) provides abundant climbing and descending training opportunities, but long descents impose extremely high eccentric loads on joints and tendons, requiring gradual progression and enhanced eccentric tolerance.

At the event level, Taiwan hosts a dense calendar of marathons, cycling events (e.g., Taiwan KOM Challenge), triathlons, and trail running races. The concentrated racing season can tempt athletes to compress recovery in pursuit of results. A complete periodized plan should be used to connect with target events, with pre-race tapering and adequate post-race recovery. On the medical side, on-site injury identification and triage capabilities at events should be strengthened to enable early intervention and prevent minor injuries from becoming chronic conditions. Overall, combining international evidence with Taiwan’s climate, terrain, and event rhythm is essential to developing prevention and rehabilitation programs truly suited to local athletes.

Common Myth-Busting

Myth 1: “You must rest completely until the pain is gone.” Complete rest may temporarily relieve symptoms, but it causes muscle loss and tissue deconditioning, prolonging recovery and increasing recurrence rates. The correct approach is “relative rest” combined with progressive loading under pain monitoring, allowing tissues to receive appropriate stimulation within tolerable limits and remodel.

Myth 2: “An abnormal imaging finding means the lesion is severe and must be treated.” Extensive research shows that asymptomatic individuals also frequently have imaging abnormalities; imaging and symptoms do not necessarily correspond. Treatment decisions should be based primarily on clinical symptoms and functional deficits, not imaging reports alone.

Myth 3: “Injections or anti-inflammatory medication can cure the problem.” Medications and injections are mostly symptom control and cannot replace exercise therapy that corrects loading and strengthens tissues. Over-reliance on passive treatments often leads to recurrent problems.

Myth 4: “Just treat the painful area.” Overuse injuries are often the terminal manifestation of dysfunction throughout the kinetic chain. Treating only the symptom site without correcting the upstream load sources and control deficits leads to recurrence. Comprehensive assessment and holistic intervention are the fundamental solutions.

Conclusion

Cycling injuries are a typical multifactorial sports injury whose occurrence and recovery involve complex interactions among training load, biomechanical alignment, neuromuscular control, tissue repair capacity, and psychosocial factors. The evidence reviewed in this article consistently points to one core message: exercise therapy centered on progressive loading is the safest and most effective intervention for the vast majority of overuse injuries, while passive treatments and invasive procedures should be used judiciously and with restraint.

For athletes in Taiwan, combining international evidence with local climate, terrain, and event rhythm to establish long-term habits of “load management, biomechanical strengthening, and listening to body signals” is far more critical than waiting until after injury to take remedial action. The best treatment for sports injuries is always prevention; and once injured, following a scientific, phased rehabilitation protocol based on objective indicators, with gradual return to sport under professional guidance, is the true path to achieving the goal of “returning to sport and staying injury-free.” May every sports enthusiast, grounded in an understanding of their own body, enjoy the joy of sport for years to come.

References

1. Clarsen B et al. (2010). BJSM
2. De Bernardo N et al. (2012). J Sports Sci
3. Silberman MR (2013). Curr Sports Med Rep
4. Dettori NJ & Norvell DC (2006). Sports Med

Related Reading

• Ergonomic Analysis of Neck Pain in Cyclists: Handlebar Height and Cervical Spine Load Research
• Multidimensional Assessment of Low Back Pain in Cyclists: A Study of Biomechanical, Psychological, and Social Factors
• Head Injuries from Cycling Falls: A Study of Helmet Protection Efficacy and Injury Patterns
• Triathlon Injuries in Taiwan: A Study of Injury Distribution Across Swimming, Cycling, and Running