Exercise is the Primary Treatment for Weakness During ADT
Exercise—specifically a combination of resistance and aerobic training 2-3 times per week—is the evidence-based intervention for managing weakness and fatigue in patients receiving androgen deprivation therapy. 1
Why Exercise Works
ADT causes measurable declines in muscle strength and physical functioning. Upper body muscle strength declines significantly, and lower body strength deteriorates relative to controls not on ADT 2. These changes contribute directly to the weakness patients experience. The 2024 ASCO-Society for Integrative Oncology guideline provides strong evidence that exercise during cancer treatment reduces fatigue incidence and severity 1.
A year-long randomized trial specifically in prostate cancer patients on ADT demonstrated that all three exercise modalities tested—resistance plus impact loading, aerobic plus resistance, and aerobic only—had beneficial effects on fatigue compared to no exercise 1. This is critical because it shows exercise works specifically in your patient population.
Practical Exercise Prescription
Based on the American College of Sports Medicine recommendations cited in the guideline 1:
- Moderate-intensity aerobic exercise: Minimum 3 sessions per week
- Combined aerobic and resistance training: 2-3 sessions per week (preferred approach)
- Resistance training alone: Twice weekly minimum
The combined approach (aerobic plus resistance) addresses both the cardiovascular deconditioning and the muscle loss that ADT causes 3, 4.
Implementation Strategy
Patients should consult with their oncology provider before starting exercise, but most can safely engage during active treatment 1. Some patients can do unsupervised exercise, while others benefit from structured programs or consultation with an exercise oncology professional 1.
Key predictors of worse outcomes include:
- Higher Gleason scores
- More medical comorbidities
- Less baseline exercise 2
These patients particularly need early intervention and may benefit from supervised programs.
Additional Management Considerations
While exercise is primary, address these concurrent issues:
Metabolic changes: ADT causes weight gain, decreased muscle mass, and increased insulin resistance 3. Exercise combined with dietary counseling helps mitigate these effects 4.
Anemia: This contributes to fatigue and weakness 3, 5. Check hemoglobin levels as part of monitoring.
Bone health: The weakness may partly reflect bone pain from osteoporosis. Consider bisphosphonates or denosumab for bone protection 3, 4.
Common Pitfalls
- Waiting for symptoms to worsen: Start exercise interventions early, ideally before ADT initiation 6
- Underestimating impact: Patients and partners need proactive education about expected side effects 6
- Ignoring comorbidities: Tailor exercise intensity to baseline conditioning and treatment toxicities 1
What Doesn't Work
The guideline explicitly states insufficient evidence for yoga, progressive muscle relaxation, or various supplements for cancer-related fatigue during treatment 1. Stick with proven exercise interventions rather than unproven alternatives.