Does Muscle Soreness Mean You’re Getting Stronger? The Real Science of DOMS and Practical Recovery Strategies

Table of Contents

1. Key Highlights
2. Introduction
3. What DOMS Is — and What It Isn’t
4. Why Soreness Is Not a Reliable Measure of Progress
5. Who Gets DOMS—and Why Some People Rarely Do
6. The Physiology of DOMS: From Microtrauma to Repair
7. Distinguishing DOMS from Injury: Red Flags and Practical Tests
8. Evidence-Based Strategies to Reduce DOMS and Preserve Adaptation
9. Practical Recovery Tools: What Works and What Doesn’t
10. Programming Examples: Applying Principles to Different Athletes
11. Monitoring and Adjusting: Practical Metrics to Guide Decisions
12. When Soreness Becomes a Problem: Overreaching and Overtraining
13. Psychological and Cultural Drivers Behind Chasing Soreness
14. Nutrition and Sleep: The Recovery Foundations
15. Supplements: Reality Check and Practical Recommendations
16. Quick Reference: Practical Steps to Manage DOMS Today
17. Case Studies: How Different Athletes Use the Same Principles
18. The Bottom Line on DOMS and Training Quality
19. FAQ

Key Highlights

• Delayed-onset muscle soreness (DOMS) reflects microscopic muscle fiber damage and inflammation, not lactic acid, and is neither necessary nor sufficient evidence of effective training.
• You can reduce the frequency and severity of DOMS through progressive overload, exercise selection, sleep, nutrition, and targeted recovery tools; distinguish DOMS from injury by pain quality, location, and functional loss.
• Practical programming—gradual eccentric exposure, scheduled active recovery, and sensible use of modalities like cold immersion or massage—sustains progress while minimizing unnecessary downtime.

Introduction

Most gym-goers and weekend warriors have learned to equate soreness with success: if you don’t ache the next day, you didn’t work hard enough. That belief shapes programming and behavior across fitness communities, from morning CrossFit boxes to marathon training groups. The sensation known as delayed-onset muscle soreness, or DOMS, does commonly follow unfamiliar or intense exercise, especially movements with heavy eccentric loading, but its presence or absence reveals little about the long-term effectiveness of your training. Understanding what DOMS actually is, why it happens, and how to manage it allows athletes and recreational exercisers to pursue steady gains without unnecessary pain or interruption.

This article explains the physiology behind DOMS, why soreness is not a reliable proxy for progress, the variables that affect how sore you get, and evidence-based methods to prevent and treat soreness while preserving adaptation. It also offers practical programming examples and a clear checklist for when soreness may actually indicate injury.

What DOMS Is — and What It Isn’t

Delayed-onset muscle soreness typically appears between 24 and 72 hours after exercise and manifests as stiffness, tenderness to touch, and reduced force production. The misconception that lactic acid causes DOMS arises from the timing of discomfort after hard workouts, but lactic acid is cleared from muscles within an hour after exercise and therefore cannot explain soreness that peaks days later.

Contemporary understanding attributes DOMS to microscopic structural disruptions in muscle fibers and connective tissue, particularly following eccentric contractions—movements in which a muscle lengthens under load, such as lowering in a squat or the down-phase of a biceps curl. That microdamage triggers a localized inflammatory response: immune cells infiltrate the affected area, blood flow increases, and a cascade of signaling molecules is released to initiate repair. The inflammatory process heightens sensitivity of nociceptors (pain receptors), producing the familiar ache.

Blood markers such as creatine kinase (CK) and myoglobin often rise after damaging exercise, peaking within the same 24–72-hour window as DOMS. These biomarkers provide objective evidence of muscle membrane disruption but do not directly correlate with how sore an individual feels. Two people with similar CK elevations may report very different subjective soreness experiences because perception varies with genetics, training history, psychological state, and other factors.

Why Soreness Is Not a Reliable Measure of Progress

Training adaptations—hypertrophy, increased strength, improved metabolic capacity—follow consistent application of progressive overload and adequate recovery. DOMS is an epiphenomenon: it can accompany a stimulus large enough to initiate adaptation, but it is neither required nor predictive.

Seasoned lifters often maintain or increase strength without frequent severe DOMS because of the repeated bout effect. After an initial bout of novel stress, muscles adapt structurally and neurologically: sarcomeres become more resistant to strain, connective tissue strengthens, and motor unit recruitment patterns change to distribute load more efficiently. These adaptations reduce the degree of muscle damage from similar future sessions. An example: a novice who performs heavy eccentric Romanian deadlifts might be incapacitated by soreness for days, while a trained powerlifter performing the same relative workload will experience little to no DOMS yet still derive strength benefits.

Performance outcomes also contradict the soreness-equals-success myth. Athletes frequently perform at world-class levels while reporting minimal DOMS during training cycles; conversely, extreme soreness can temporarily impair training quality, reducing force output, altering technique, and increasing injury risk. Scheduling excessive soreness into weekly programming can therefore be counterproductive.

Who Gets DOMS—and Why Some People Rarely Do

DOMS susceptibility varies widely. The most influential factors include:

• Novelty of exercise: Muscles unaccustomed to a movement pattern or load show greater structural disruption.
• Eccentric emphasis: Exercises with long, controlled lengthening phases cause more microtrauma per unit effort than purely concentric work.
• Intensity and volume: Heavy loads, high-repetition sets, and long sessions elevate the likelihood of DOMS.
• Training status: Novices, detrained individuals, and athletes switching disciplines (e.g., a cyclist beginning resistance training) have higher susceptibility.
• Age and sex: Older adults generally experience greater and more prolonged recovery times, although sex differences are complex and task-dependent.
• Genetics and pain perception: Variations in inflammatory response, collagen composition, and individual pain thresholds influence reported soreness.
• Nutrition and sleep: Inadequate caloric intake, insufficient protein, dehydration, and poor sleep impair repair and can intensify perceived soreness.

Real-world example: A 35-year-old recreational runner adds heavy step-downs and eccentric calf work to his routine to reduce injury risk and improve power. He reports intense DOMS for the first week. After two weeks of controlled exposure, soreness drops substantially while his strength and running economy improve. The repeated bout effect explains the rapid decline in soreness despite continued training.

The Physiology of DOMS: From Microtrauma to Repair

When an eccentric contraction causes mechanical strain beyond usual operating ranges, tiny disruptions occur in the sarcomeres—the fundamental contractile units of muscle. These disruptions compromise the integrity of the muscle cell membrane, allowing intracellular components to leak into the extracellular space. The immune system recognizes damage-associated molecular patterns and mobilizes neutrophils and macrophages to the site.

This immune influx serves two functions: it clears debris and secretes growth factors and cytokines that coordinate repair and remodeling. The inflammatory milieu also increases interstitial fluid and sensitizes pain receptors, which contributes to the stiffness and tenderness associated with DOMS. Over days, satellite cells—muscle stem cells—activate, proliferate, and fuse to existing fibers or form new fibers, driving hypertrophy when supported by sufficient protein intake and anabolic signaling.

That sequence explains why soreness peaks days after exercise: the inflammatory and repair processes take time to escalate and resolve. It also clarifies why repeated exposures reduce damage: adaptations at the cellular and extracellular matrix levels, including improved sarcomere alignment, strengthened connective tissue, and more efficient neuromuscular recruitment, reduce mechanical stress for the same external load.

Distinguishing DOMS from Injury: Red Flags and Practical Tests

DOMS is generally diffuse, symmetrical (when exercise was bilateral), and improves with gentle activity. Injury pain is often sharp, localized to a tendon, joint, or a specific spot within a muscle, and may be accompanied by swelling, loss of range of motion, mechanical signs (locking, popping), or a sudden onset during a specific event. Red flags that warrant professional evaluation include:

• Sharp, shooting pain with a defined moment of onset.
• Joint instability or inability to bear weight.
• Severe swelling, bruising, or deformity.
• Persistent weakness that prevents basic tasks.
• Numbness, tingling, or signs of nerve involvement.
• Lack of improvement after several days or progressive worsening.

Simple field tests provide quick differentiation: does light walking or a gentle warm-up reduce discomfort? DOMS often eases with movement. Can you generate near-normal strength in the affected muscle when highly motivated? If not, suspect injury. If performance is acutely and disproportionately compromised after a single repetition or that first lift, view it with suspicion.

Case in point: A triathlete who felt a sudden, sharp pain in the posterior thigh during a sprint and then was unable to extend the knee fully likely sustained a hamstring tear rather than DOMS. Immediate rest and medical consultation prevented exacerbation.

Evidence-Based Strategies to Reduce DOMS and Preserve Adaptation

Preventing or minimizing DOMS requires balancing exposure to sufficient stimulus for adaptation against excessive tissue damage that impairs subsequent training. Effective strategies include:

1. Progressive Overload with Intelligent Eccentric Introduction
   • Gradually increase load, volume, and eccentric emphasis. For example, add eccentric reps or increase tempo over several sessions rather than switching abruptly from concentric-only training to heavy, slow eccentrics.
   • When introducing a new exercise, start with 2–3 lighter sets to condition tendons and muscles before full-intensity work.
2. Warm-up and Movement Preparation
   • Use dynamic warm-ups specific to the session: movement rehearsals at low loads, mobility work for relevant joints, and brief neuromuscular activation sets at submaximal intensity.
   • Warm tissue is more pliable and better prepared for eccentric stresses, lowering acute injury risk.
3. Active Recovery
   • Light aerobic movement (20–30 minutes of walking, cycling, or swimming at low intensity) increases circulation, aids metabolic waste removal, and reduces perceived stiffness.
   • Active recovery improves function more than complete rest in many cases while maintaining readiness for the next heavy session.
4. Strategic Rest and Periodization
   • Schedule harder sessions with built-in recovery days. Use deload weeks every 4–8 weeks depending on volume and intensity.
   • For novices, two full rest days per week often suffice; for high-volume athletes, alternating intensity through microcycles preserves training quality.
5. Sleep and Nutrition
   • Target 7–9 hours of nightly sleep; slow-wave sleep supports release of growth hormone and anabolic processes.
   • Ensure sufficient daily protein (roughly 1.6–2.2 g/kg body weight for most training goals) distributed across meals with each meal containing 20–40 g of high-quality protein to satisfy leucine thresholds that stimulate muscle protein synthesis.
   • Maintain adequate total energy intake; chronically training in a calorie deficit increases susceptibility to damage and impairs repair.
6. Hydration, Electrolytes, and Micronutrients
   • Maintain adequate hydration; even mild hypohydration can impair recovery. There are no universal fluid volumes; drink to thirst and monitor urine color as a pragmatic guide.
   • Omega‑3 fatty acids show modest anti-inflammatory benefits and may reduce muscle soreness in some studies. Antioxidant supplementation (e.g., high-dose vitamin C, E) deserves caution as chronic, high-dose antioxidant intake may blunt training adaptations by attenuating oxidative signaling important for muscle remodeling.
7. Targeted Modalities
   • Massage and foam rolling: both can reduce soreness and improve range of motion. Regular post-session soft-tissue work has small-to-moderate benefits for subjective soreness and short-term function.
   • Cold water immersion: short-term relief for soreness and perceived recovery, especially after endurance or long, damaging sessions. Frequent use immediately after strength training may blunt hypertrophic adaptations when used chronically.
   • Compression garments: modest reductions in perceived soreness and improvements in recovery markers in some athletes, particularly when used post-exercise.
   • Contrast baths, electrical stimulation, and other modalities produce mixed results; choose tools that help you adhere to training rather than chasing elusive marginal gains.
8. Judicious Use of Pharmacologic Options
   • Over-the-counter NSAIDs reduce pain but carry gastrointestinal and cardiovascular risks if used long-term. Repeated NSAID use may blunt aspects of muscle repair and adaptation; reserve them for short-term symptom control under guidance.
   • Acetaminophen offers analgesia without the same anti-inflammatory profile but has hepatic risks at high doses.
9. Supplements with Better Evidence
   • Creatine monohydrate: well-supported to increase strength and lean mass and to reduce markers of muscle damage and soreness in some contexts. Typical dosing: 3–5 g/day for maintenance; optional loading phase of ~20 g/day divided for 5–7 days to accelerate saturation.
   • Protein and essential amino acids: support repair when total daily intake is adequate. Leucine-rich sources are particularly effective at stimulating muscle protein synthesis.
   • BCAAs: evidence for meaningful reduction in DOMS is mixed, and benefits are minimal if total protein intake is already sufficient.

Practical Recovery Tools: What Works and What Doesn’t

Fitness culture breeds toolkits promising quick fixes. Evaluate interventions by whether they reduce pain, restore function, and preserve long-term adaptation.

• Static stretching before exercise has negligible effect on DOMS prevention and can acutely reduce force production if held long. Reserve static stretching for post-workout mobility or separate sessions.
• Foam rolling is affordable, accessible, and has consistent albeit modest evidence for short-term reductions in soreness and improved ROM.
• Ice packs and cold-water immersion offer immediate pain relief and reduced swelling. For strength and hypertrophy-focused athletes, avoid habitual cold exposure immediately after heavy strength training to prevent interference with anabolic signaling.
• Heat promotes blood flow and may help with stiffness; apply as a warm-up aid rather than a primary recovery method immediately after damaging exercise.
• Topical analgesics and menthol-based creams provide local relief that can allow continuation of training but do nothing for tissue repair.

Example scenario: After a long, hilly 30-km run, a runner uses 10–12 minutes of cold water immersion at 10–15°C to reduce soreness and perceived fatigue for the next day’s moderate session. A strength athlete finishing a heavy hypertrophy block opts for contrast showers and post-session massage rather than daily cold plunges to avoid blunting gains.

Programming Examples: Applying Principles to Different Athletes

Tailor the approach to experience level, sport demands, and recovery capacity.

1. Novice Strength Trainee (Goal: Build Strength and Muscle)
   • Frequency: 3 full-body sessions per week (e.g., Monday, Wednesday, Friday).
   • Session structure: Compound movements with moderate volume. Start with 2 working sets per exercise at 60–70% 1RM, progress by adding 1 set or increasing load by 2–5% each week.
   • Eccentric exposure: Incorporate slow eccentrics on key lifts only after 4–6 weeks of consistent training. Begin with 2–3 reps at a slightly slower tempo once per week.
   • Recovery: Active recovery days with walking or cycling, 7–9 hours sleep, 1.8 g/kg protein daily.
2. Intermediate Hypertrophy Athlete (Goal: Increase Muscle Mass)
   • Frequency: 4–5 sessions per week with upper/lower split.
   • Session structure: Use progressive overload with variations in intensity across the week (heavy vs. lighter hypertrophy days).
   • Eccentric management: Include one controlled eccentric-focused set per muscle group every 7–10 days; avoid multiple consecutive days with large eccentric volumes.
   • Recovery modalities: Foam rolling, post-session massage as needed, creatine supplementation, 1.6–2.2 g/kg protein.
3. Endurance Athlete Introducing Strength Work (Goal: Improve Durability)
   • Frequency: 2 short strength sessions per week emphasizing movement quality and eccentric control.
   • Session structure: Lower total volume and focus on single-leg strength and hip mechanics. Begin with bodyweight or light loading and progress slowly.
   • Return-to-run consideration: Space hard strength days 48–72 hours before the longest run of the week to avoid impaired running sessions due to DOMS.
4. High-Performance Period (Competition Phase)
   • Reduce eccentric overload and volume, focus on maintenance load and neuromuscular quality.
   • Use acute modalities—massage, compression, short cold immersions—to optimize readiness without chronic suppression of adaptation.
   • Emphasize sleep hygiene and on-site recovery strategies.

Monitoring and Adjusting: Practical Metrics to Guide Decisions

Objective performance measures and subjective scales allow precise adjustments to training.

• Soreness scale: Rate soreness 0–10 each morning. Persistent ratings above 6 that interfere with daily activity merit program modifications.
• Performance measures: Track bar speed, sets completed, and objective lifts. If bar speed drops or velocity-based metrics decline, reduce intensity or volume.
• Daily readiness questionnaires: Include sleep quality, mood, muscle soreness, and perceived recovery. Use these data to make small auto-regulatory adjustments (e.g., drop a set, reduce load 5–10%).
• Weekly averages: Monitor weekly training load and ensure progressive but sustainable increases. Sudden 20–30% increases in volume or intensity commonly produce excess DOMS.
• Long-term tracking: Look for trends over 4–8 week blocks. Increased frequency of high-soreness days suggests insufficient recovery or excessive load.

Example: A competitive weightlifter notices repeated 20–25% decline in snatch bar speed on day two after sessions with heavy eccentric pulls. The coach reduces eccentric volume by half and adds an extra rest day; performance metrics return to baseline within a week and soreness decreases.

When Soreness Becomes a Problem: Overreaching and Overtraining

Occasional DOMS is normal; persistent, relentless soreness with declining performance signals maladaptation. Overreaching is an acute phase where temporary performance decline follows a spike in training load but recovers with short-term rest. Overtraining syndrome is chronic, with systemic symptoms such as persistent fatigue, mood disturbances, sleep disruption, and hormonal imbalances.

Preventive measures include planned deloads, monitoring training stress balance (training load vs recovery capacity), and maintaining adequate energy availability. If systemic signs appear—sleep problems, decreased appetite, mood changes, or prolonged lack of progress—reduce load and consult a sports medicine specialist or coach for systematic evaluation.

Psychological and Cultural Drivers Behind Chasing Soreness

Soreness carries cultural currency. Gym selfies next morning, “no pain, no gain” slogans, and social reinforcement perpetuate the myth that soreness is necessary. That conditioning can lead athletes to intentionally seek soreness through unnecessary volume spikes or gimmick exercises, compromising training consistency.

Reframing soreness as a metric to be managed—not worshipped—supports long-term adherence. Coaches and athletes who prioritize consistent, measurable improvements over episodic discomfort maintain higher training quality and lower injury rates.

Nutrition and Sleep: The Recovery Foundations

Adequate sleep and nutrition are non-negotiable for efficient recovery and reduced DOMS impact.

• Protein timing and distribution: Aim for 20–40 g of high-quality protein per meal across 3–5 meals daily, focusing on leucine-rich sources (whey, dairy, eggs, lean meats). A pre- or post-exercise protein dose accelerates muscle protein synthesis recovery.
• Caloric intake: Provide enough energy to meet training demands. Chronic energy deficit forces the body to prioritize immediate substrate needs over repair, prolonging soreness.
• Creatine: Supplementation enhances phosphocreatine stores, supports high-intensity performance, and demonstrates consistent benefits for strength and reduced markers of muscle damage.
• Omega-3s and polyphenols: Small benefits for inflammation and recovery; integrate through whole foods like fatty fish, nuts, and colorful produce. Avoid mega-dosing isolated antioxidants during intense training blocks.
• Hydration: Rehydrate based on sweat loss estimates and urine color. Dehydration impairs recovery but is rarely the sole driver of DOMS.

Real example: A collegiate rugby player who maintains 3 g/kg carbs and 1.8–2.0 g/kg protein with creatine finds faster recovery and less soreness than teammates with inconsistent diets, enabling sustained high-intensity training through the season.

Supplements: Reality Check and Practical Recommendations

The supplement industry markets many products with grandiose claims. Evaluate supplements based on mechanism, evidence quality, and safety.

• Creatine monohydrate: High-quality evidence for strength, lean mass, and reduced markers of muscle damage; recommended dose 3–5 g/day.
• Protein and essential amino acids: Effective when they help meet total daily protein targets; a convenient post-workout shake can be helpful.
• BCAAs: Limited benefit if total protein intake is sufficient. They may provide small reductions in soreness in protein-deficient contexts.
• Omega-3s: Anti-inflammatory properties may aid recovery modestly; recommended intake 1–3 g combined EPA/DHA daily for many athletes.
• Curcumin and tart cherry: Emerging evidence suggests small improvements in soreness and recovery; dosing protocols vary and product quality matters.
• High-dose antioxidants and chronic cold immersion: Use with caution during hypertrophy-focused blocks due to potential interference with adaptive signaling.

When choosing supplements, prefer those with reproducible, high-quality evidence and recognizable manufacturing standards. Consult a qualified sports dietitian or physician if unsure.

Quick Reference: Practical Steps to Manage DOMS Today

• If soreness is mild: Perform light movement, prioritize sleep and protein, and proceed with scheduled training with reduced volume.
• If soreness is moderate and interferes with performance: Reduce load by 10–20% or cut one set per exercised muscle group; schedule an extra active recovery day.
• If soreness is severe or accompanied by red-flag symptoms: Stop activity, rest, and seek medical evaluation.
• To prevent future severe DOMS: Introduce new movements slowly, add eccentric work progressively, and maintain consistent conditioning.

Sample immediate routine after a session that induced DOMS:

• 10–15 minutes active cooldown: easy cycling or brisk walking.
• 5–10 minutes targeted foam rolling on affected muscle groups.
• Protein-rich meal or shake within 2 hours (20–30 g protein).
• Gentle mobility or yoga the next day and a light cardio session if tolerated.
• Adequate sleep and hydration each night until soreness resolves.

Case Studies: How Different Athletes Use the Same Principles

1. Weekend Warrior (Multisport Amateur)
   • Context: Plays soccer on weekends, runs twice weekly, wants to add strength without sidelining matches.
   • Approach: Two 30–40 minute strength sessions with controlled eccentric work, scheduled on Tuesday and Thursday; leg workouts contain only 2–3 working sets of compound lifts to avoid excessive soreness before weekend games.
   • Outcome: Lower injury incidence and improved match performance without recurring DOMS.
2. Master Athlete Starting Resistance Training
   • Context: 62-year-old beginning resistance training for bone health and functional strength.
   • Approach: Start with twice-weekly low-volume sessions emphasizing tempo 2:2:2 (slow eccentric), progressive overload at smaller increments (1–2% per week), and extended recovery periods initially.
   • Outcome: Initial soreness present but declines after three sessions as neuromuscular adaptations reduce damage; functional mobility and strength increases within 8–12 weeks.
3. Competitive Cyclist Introducing Strength Block
   • Context: A cyclist adds six weeks of eccentric-loaded strength to improve sprint power.
   • Approach: Carefully periodized plan with progressive eccentric exposure and strategic cold immersion after key long rides to preserve racing readiness.
   • Outcome: Improved sprint power with manageable soreness by planning heavier sessions away from competition windows.

The Bottom Line on DOMS and Training Quality

Soreness communicates that the body encountered an unfamiliar or sufficiently intense mechanical challenge that triggered repair processes. It does not guarantee that the challenge was optimal for long-term adaptation. Program design, recovery practices, and athlete monitoring determine whether those repair processes translate into meaningful gains or merely interrupt training. Seeing soreness as a variable to control—not a goal—leads to more consistent progress, better performance, and fewer injuries.

FAQ

Q: Is muscle soreness necessary to get stronger or build muscle? A: No. Soreness often accompanies novel or intense stimuli but is not required for hypertrophy or strength gains. Consistent progressive overload and adequate recovery drive adaptation regardless of DOMS.

Q: How long does DOMS typically last? A: DOMS usually peaks 24–72 hours after exercise and resolves within 3–7 days. Duration varies by exercise novelty, intensity, and individual recovery capacity.

Q: Can I train through DOMS? A: Mild DOMS typically allows continued training, often at reduced volume or intensity. If soreness is severe and compromises movement quality or increases injury risk, prioritize recovery and modify sessions.

Q: What’s the difference between muscle soreness and a muscle strain? A: DOMS is diffuse, improves with movement, and lacks localized sharp pain. A strain often has a sudden onset associated with a specific movement, sharp or focal pain, reduced strength, swelling, or bruising. Seek evaluation if symptoms suggest injury.

Q: Do supplements like creatine and BCAAs reduce DOMS? A: Creatine has consistent evidence supporting improved recovery and reduced markers of damage. BCAAs show mixed results and offer minimal benefit if total protein intake is adequate. Prioritize whole-food protein and creatine for measurable effects.

Q: Does cold water immersion help recovery? A: Cold immersion reduces perceived soreness and can speed short-term recovery after long or damaging sessions. Frequent cold immersion immediately after resistance training may blunt muscle adaptation; use strategically around competition or when rapid recovery is needed.

Q: Will stretching prevent DOMS? A: Static stretching before exercise does not prevent DOMS and can reduce acute force production. Post-exercise stretching may help flexibility but has limited impact on soreness.

Q: How much protein should I eat to help recovery? A: For most training goals, 1.6–2.2 g/kg body weight per day supports repair and adaptation. Distribute intake across meals with 20–40 g high-quality protein per meal to stimulate muscle protein synthesis effectively.

Q: How can I structure training to minimize DOMS while still improving? A: Introduce new movements slowly, increase load and volume in small increments, schedule hard sessions with adequate recovery, use active recovery, and monitor readiness with subjective and objective metrics. Prioritize sleep and nutrition.

Q: When should I see a doctor for post-exercise pain? A: Seek medical attention for sharp, persistent, or localized pain after a specific event; inability to bear weight, severe swelling, bruising, numbness, or progressive weakness that does not improve with rest.