Pelvic Floor Pressure During Running: Urinary Leakage Issues in Female Runners and Intervention Research

Sports-related urinary incontinence (stress urinary incontinence in female athletes) is one of the clinically highly concerning sports injuries among endurance and competitive athletic populations, with its pathology primarily located in the pelvic floor. Epidemiological studies indicate that the incidence of this injury among physically active populations is far from negligible, and it is closely associated with 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 sports-related urinary incontinence is a recurring representative among them. Research indicates significant differences in incidence by sex, age, and sport discipline, highlighting the importance of individualized assessment.

In Taiwan, with the growing popularity of全民運動 (sports for all) and the flourishing development of marathons, cycling, and triathlon events, outpatient visits for sports-related urinary incontinence have been rising year by year. Athletes in urban areas often train at high frequency on hard surfaces, and combined with the premature fatigue and insufficient recovery caused by the subtropical humid and hot climate, the repetitive loading on the pelvic floor has become an important topic in local sports medicine. This article will provide an in-depth analysis covering injury mechanisms, diagnostic assessment, treatment comparisons, rehabilitation progression, prevention strategies, and local applications in Taiwan, integrating the latest academic evidence to help readers establish a scientific understanding.

Injury Mechanism Analysis

The core pathomechanism of sports-related urinary incontinence can be summarized as “insufficient pelvic floor muscle support under impact loading.” From a biomechanical perspective, the pelvic floor endures repetitive mechanical loads with high peak values 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.

Research by Nygaard IE et al. (1994). Obstet Gynecol, using imaging and biomechanical analysis, revealed that imbalance in any link of the kinetic chain alters the force distribution on the pelvic floor. Proximal control deficits (e.g., poor hip and trunk stability) or distal alignment abnormalities (e.g., excessive foot pronation) can transmit forces through mechanical pathways, subjecting the target tissue to non-physiological shear and compressive stresses. This concept of “malalignment cascade” emphasizes that pain at a single site is often the terminal manifestation of dysfunction across the entire kinetic chain.

At the anatomical and tissue level, Bø K (2004). Sports Med further pointed out that repetitive loading induces the release of local inflammatory mediators, disorganization of collagen fiber arrangement, and, in the chronic phase, neovascularization with concomitant nerve ingrowth, 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. Dakic JG et al. (2021). BJSM, using electromyography and motion analysis, confirmed 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—control deterioration—re-injury.” Furthermore, fatigue amplifies these deficits: when muscles fatigue, their capacity to absorb impact decreases, forcing loads to shift to passive structures (bone, ligaments, tendon attachment sites), accelerating microdamage accumulation.

In summary, sports-related urinary incontinence is 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 precise diagnosis and effective intervention.

Diagnostic and Assessment Methods

The diagnosis of sports-related urinary incontinence should be established on the triangulation of a comprehensive history taking, systematic physical examination, and appropriate imaging confirmation. History collection must clarify the temporal pattern of pain onset, its relationship to training load, aggravating and relieving factors, and prior injury history. Typical overuse injuries present with a “progressive, activity-related” pain pattern, whereas sudden severe pain warrants vigilance for acute structural disruption or stress fracture.

Regarding 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. Nygaard IE et al. (1994). Obstet Gynecol and Leitner M et al. (2017). Neurourol Urodyn 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 selection of imaging modalities should be guided by the clinical question, avoiding over-investigation. The following table summarizes the characteristics of commonly used imaging and examination tools:

Imaging/Examination Tool	Primary Purpose	Sensitivity Overview	Clinical Notes
Plain X-ray	Exclude fractures, calcifications, and bony structural abnormalities	Low for early soft tissue pathology	Preferred initial screening, low cost
Ultrasound (US)	Real-time assessment of sports-related urinary incontinence 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 lesions	High for both bone and soft tissue	High cost; 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 populations. Bø K (2004). Sports Med reminds us 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 based on this, formulate individualized treatment and rehabilitation plans. Grading systems (e.g., by symptom severity or imaging stage) aid in prognosis determination and return-to-play timeline planning.

Comparison of Treatment Options

Treatment for sports-related urinary incontinence should follow a stepwise principle of “conservative first, invasive second.” First-line treatment centers on exercise therapy, supplemented by pain management and activity modification; invasive treatments are reserved for cases where conservative treatment has failed or where there is clear structural damage. In recent years, high-quality RCTs have consistently supported progressive loading exercise as the most effective intervention for most overuse injuries. A systematic review by Nygaard IE et al. (1994). Obstet Gynecol showed that exercise programs based on functional, progressive loading were superior to passive treatment in terms of pain and functional improvement, with long-term maintenance of effects.

The table below compares the mechanisms, levels of evidence, and indications for the main treatment options:

Treatment Option	Mechanism of Action	Level of Evidence	Indications
Exercise therapy (progressive loading)	Promotes tissue adaptation, restores strength and control	High (supported by multiple RCTs)	First choice at all stages, long-term mainstay
Manual therapy	Short-term pain relief, improves joint mobility	Moderate	Adjunct in the acute phase
Extracorporeal shock wave therapy (ESWT)	Mechanotransduction promotes 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 decompression of structural lesions	Depends on the lesion	No response to conservative treatment for 3–6 months or structural damage

Regarding injection therapy, Dakic JG et al. (2021). BJSM and related meta-analyses show divergent results: corticosteroid injections may provide short-term pain relief, but in the medium to long term they may be detrimental to tissue healing and even increase recurrence; evidence for platelet-rich plasma (PRP) is highly heterogeneous, with some studies showing benefit for specific tendinopathies, but the overall benefit still requires confirmation through more rigorous trials. Extracorporeal shock wave therapy (ESWT) shows moderate-level evidence for chronic refractory lesions and can be an option when conservative treatment has plateaued.

Surgery is indicated only for clear structural damage (such as complete tears or unstable osteochondral lesions) or for those who have failed long-term conservative management. Leitner M et al. (2017). Neurourol Urodyn noted that even for lesions traditionally倾向于 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 exercise demands, timelines, and personal preferences.

Progressive Rehabilitation Protocol

Rehabilitation for sports-related urinary incontinence should be based on the core principle of “progressive loading under pain monitoring.” Clinically, a 0–10 numeric pain rating scale is commonly used, allowing pain during exercise and for 24 hours after exercise to not exceed 3/10, and morning stiffness not to worsen, as indicators for safe progression. Rehabilitation is typically divided into four phases, and each phase must meet clear criteria-based progression before advancing, rather than relying solely on time.

The phased rehabilitation framework is as follows:

Phase	Goal	Representative Interventions	Advancement 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 reaches ≥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 injury prevention	Gradually return to sport-specific training volume	Progressive return to running/cycling volume, load monitoring	Pass return-to-sport testing, load tolerance achieved

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 pain relief and maintain strength in many tendinopathies. Phase 2 introduces progressive resistance and eccentric training to promote collagen remodeling and strengthening of the tendon-muscle unit. Phase 3 adds plyometric and sport-specific movements to rebuild tissue tolerance to high-speed, high-impact loading. Phase 4 uses quantified load monitoring (such as weekly training volume changes and acute:chronic workload ratio) to ensure a smooth return-to-sport process, avoiding recurrence due to 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 sports-related urinary incontinence 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 primary 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 weaken tissue repair capacity and are common upstream factors in many overuse injuries.

Building biomechanical resilience requires addressing the entire kinetic chain. The following are specific, evidence-based 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 (such as moderately increasing cadence and avoiding excessive stride length) and cycling posture (appropriate saddle and handlebar configuration) to reduce peak loading per stride/revolution.
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: Use periodized training programming with interspersed deload weeks to allow adequate time for 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 a simple, executable format, is the 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 Application in Taiwan

Taiwan’s geography, climate, and event environment have unique influences on the occurrence and management of sports-related urinary incontinence. Climatically, Taiwan’s summer is hot and humid, causing core body temperature to rise quickly during exercise and increasing dehydration risk; premature fatigue leads to decreased neuromuscular control, indirectly increasing the risk of pelvic floor injury. It is recommended that local athletes train in the early morning or evening, pay attention to hydration and electrolytes, and proactively reduce training intensity and volume on hot days.

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

At the event level, Taiwan has a dense calendar of marathons, cycling events (such as the 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 tapering before races and adequate recovery afterward. On the medical side, injury identification and triage capabilities at event sites 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 racing rhythm is essential to developing prevention and rehabilitation programs that are truly suited to local athletes.

Common Myths Debunked

Myth 1: “You should rest completely until the pain is gone.” Complete rest may temporarily relieve symptoms, but it causes muscle loss and tissue deconditioning, which actually prolongs recovery and increases the recurrence rate. The correct approach is “relative rest” combined with progressive loading under pain monitoring, allowing tissues to be continuously stimulated and remodeled within a tolerable range.

Myth 2: “Abnormal imaging findings mean the pathology is severe and must be treated.” A large body of research shows that asymptomatic individuals also frequently have abnormal imaging findings—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 management; they cannot replace exercise therapy that corrects loading and strengthens tissues. Over-reliance on passive treatments often leads to recurring problems.

Myth 4: “Just treat the painful area.” Overuse injuries are usually the end-stage manifestation of dysfunction along the entire kinetic chain. Treating only the symptom without correcting the upstream loading sources and control deficits makes recurrence likely. Comprehensive assessment and whole-body intervention are the fundamental solution.

Conclusion

Exercise-related urinary incontinence is a typical multifactorial sports injury. Its onset and recovery involve a complex interaction 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 race rhythms to build long-term habits of “load management, biomechanical strengthening, and listening to body signals” is far more critical than repairing damage after injury occurs. The best treatment for sports injuries is always prevention; and once injured, following a scientific, staged rehabilitation protocol based on objective indicators, with gradual return to sport under professional guidance, is the true path to “returning to sport without reinjury.” May every sports enthusiast, grounded in an understanding of their own body, enjoy the joy of exercise for years to come.

References

1. Nygaard IE et al. (1994). Obstet Gynecol
2. Bø K (2004). Sports Med
3. Dakic JG et al. (2021). BJSM
4. Leitner M et al. (2017). Neurourol Urodyn

Related Reading

• Urinary Issues in Female Runners: Pelvic Floor Muscle Training for Leaking During Running
• Neurovascular Mechanisms of Plantar Fasciitis: Latest Pathological Updates and Treatment Evolution Research
• Cycling and “Underbody” Care: A Complete Guide to Exercise and Pelvic Floor Health—Incontinence Is Not Taboo, It Can Be Trained
• Differential Diagnosis of Pelvic Stress Fractures: Diagnostic Validity of MRI and Bone Scans