HSA | FSA CARDS ARE NOW ACCEPTED

Last reviewed: May 12, 2026 Last updated: May 12, 2026

Written by: Jay Hastings , CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance. His work has included scaling healthcare startups, leading CLIA lab integrations, and helping expand consumer access to precision health tools.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

How IGF-II and rs680 Affect Muscle Damage and Recovery

Muscle damage from exercise happens when intense or new activities cause tiny tears in muscle fibers. That damage leads to soreness, swelling, and temporary reductions in strength and performance. The IGF-II gene plays an important role in muscle repair and growth. Variations at the rs680 location in IGF-II can influence how efficiently your body heals and rebuilds muscle tissue after exercise.

This article explains what the rs680 genotypes mean for exercise-induced muscle damage, and provides practical, evidence-informed steps you can use to support recovery. Remember: PlexusDx does not provide medical advice. This information is educational only. Always consult your healthcare provider before starting new supplements, changing diet patterns, or altering your training plan.

Why IGF-II Matters for Muscle Repair

Insulin-like growth factor 2, commonly called IGF-II, helps regulate cellular growth, differentiation, and tissue repair. After exercise-related microtears occur, signaling pathways involving IGF-II influence the speed and quality of muscle regeneration. Variants at rs680 may change expression or activity of IGF-II, which can alter the typical recovery process. The practical result is differences in soreness, inflammation, and time needed to return to peak strength.

Common Symptoms of Exercise-Induced Muscle Damage (EIMD)

  • Muscle soreness that peaks 24 to 72 hours after exercise
  • Temporary loss of muscle strength or reduced range of motion
  • Mild swelling and stiffness
  • Possible increase in inflammatory markers or muscle enzymes after intense activity

General Recovery Principles (Useful for Everyone)

Regardless of genotype, these core strategies support faster, safer recovery:

  • Prioritize protein: Aim for adequate daily protein distributed across meals to support repair and muscle protein synthesis.
  • Include anti-inflammatory foods: Fatty fish, walnuts, flax, berries, leafy greens, turmeric, and ginger help modulate inflammation.
  • Stay hydrated: Fluid balance supports nutrient delivery and metabolic waste removal.
  • Plan rest and progressive loading: Allow sufficient rest days and increase training volume or intensity gradually, especially when introducing new movements.
  • Use targeted recovery tools: Sleep, compression, gentle mobility work, and active recovery (light aerobic activity) aid tissue healing.
  • Consider supplements carefully: Omega-3 fatty acids and antioxidants can reduce excessive inflammation and may speed repair when used appropriately.

Genetic Interpretations for rs680 (IGF-II)

2 effect alleles (TT) — Higher risk of exercise-induced muscle damage

If your genotype is TT, you carry two copies of the effect allele at rs680. This pattern is associated with a greater likelihood of more pronounced muscle damage after intense or unfamiliar exercise, particularly in men. You may experience stronger or longer-lasting soreness, and temporary reductions in strength may last longer than average.

Practical Recommendations

  • Adjust training volume: Reduce frequency or intensity when introducing new exercises. Use a slower progression to allow repair pathways more time to adapt.
  • Prioritize protein timing: Target 20 to 40 g of high-quality protein within 1 to 2 hours after training and distribute 3 to 5 protein-containing meals across the day.
  • Emphasize anti-inflammatory nutrition: Include omega-3 rich foods (salmon, mackerel, chia), colorful vegetables and fruits, and spices like turmeric and ginger.
  • Supplement suggestions: Consider omega-3 supplements (EPA + DHA) and antioxidant support such as vitamin C or polyphenol-rich extracts. Discuss doses with a healthcare provider.
  • Recovery protocols: Prioritize sleep, incorporate light aerobic or mobility sessions on sore days, and use contrast baths or cold therapy cautiously based on how they affect your performance goals.
  • Monitor and test: If you experience unusually severe or persistent weakness, discuss blood tests or clinical evaluation with your healthcare provider to rule out other causes.
1 effect allele (GT) — Moderate predisposition to exercise-induced muscle damage

If your genotype is GT, you carry one copy of the effect allele. This suggests a moderate genetic predisposition to exercise-induced muscle damage. Your recovery may be somewhat less efficient than people without the T allele but not as strongly affected as those with two copies.

Practical Recommendations

  • Progress gradually: Increase training intensity and volume stepwise to reduce the risk of large, sudden muscle insults.
  • Maintain adequate daily protein: Aim for regular protein intake spread across meals to support ongoing repair.
  • Anti-inflammatory focus: Add omega-3 rich foods and plenty of vegetables and fruits to your meals.
  • Consider supplements: Low-to-moderate dose omega-3 supplementation and antioxidant-rich supplements may help. Check with your provider for personalized dosage.
  • Use recovery strategies: Prioritize sleep, hydration, and active recovery sessions after heavy workouts to reduce prolonged soreness.
0 effect alleles (GG) — Typical response to muscle damage and repair

If your genotype is GG, you carry two copies of the non-effect allele. Your genetic profile suggests a standard or typical response to exercise-induced muscle damage and repair. You are less likely to experience unusually severe or prolonged soreness specifically due to IGF-II variation.

Practical Recommendations

  • Follow standard recovery practices: Balanced protein intake, anti-inflammatory foods, good hydration, and progressive training remain important.
  • Optimize sleep and stress: These factors affect repair processes and overall recovery capacity.
  • Use targeted supplements as needed: Omega-3s and antioxidants can provide general anti-inflammatory support, particularly around periods of increased training load.
  • Listen to your body: Even with a typical genetic profile, sudden increases in training intensity or volume can cause significant soreness. Scale appropriately.

Practical Meal and Supplement Tips

  • Post-workout protein: A mix of whey or plant protein with carbohydrate can promote recovery; aim for 20 to 40 g protein after resistance workouts.
  • Daily protein target: Adjust to body size and goals—general ranges 1.2 to 2.0 g/kg body weight per day for active individuals, higher during intense training phases.
  • Omega-3 guidance: Food first approach with fatty fish 2 to 3 times per week; consider supplements if intake is low. Discuss dose with your clinician.
  • Antioxidant-rich choices: Berries, citrus, leafy greens, nuts, and green tea help manage oxidative stress without blunt training adaptations when used sensibly.

When to Talk to Your Healthcare Provider

  • If soreness or weakness is severe, persists longer than expected, or limits daily activities
  • If you are considering high-dose supplements or combining multiple anti-inflammatory agents
  • If you have underlying medical conditions, are pregnant, breastfeeding, or taking medications that could interact with supplements

PlexusDx provides educational genetic insights to help you understand potential predispositions. This information is not medical advice. Always consult your healthcare provider before making changes to your diet, supplement routine, or exercise program.

If this genetic variant is present in your PlexusDx results, the following tests and reports are commonly used to explore it further:

🧬 Genetic Tests:

🧪 Blood Tests:

📄 Genetic Report:

Frequently Asked Questions About Muscle Damage and IGF-II rs680

What does the IGF-II rs680 variant mean for muscle soreness and recovery?

The IGF-II gene helps regulate cellular growth, differentiation, and tissue repair after exercise-related microtears. Variations at rs680 may influence how efficiently your body rebuilds muscle, which can affect the strength, duration, and intensity of exercise-induced muscle damage symptoms such as soreness, swelling, and temporary strength losses.

How do rs680 genotypes (TT, GT, GG) differ in exercise-induced muscle damage risk?

TT (two effect alleles) is associated with a higher risk of more pronounced muscle damage after intense or unfamiliar exercise, often with stronger or longer-lasting soreness and temporary strength reductions. GT (one effect allele) suggests a moderate predisposition, with recovery that may be somewhat less efficient than non-effect carriers. GG (no effect alleles) suggests a typical response, with a lower likelihood of unusually severe or prolonged soreness specifically due to IGF-II variation.

What recovery and nutrition strategies are recommended for each rs680 genotype?

Regardless of genotype, prioritize protein (including 20–40 g post-workout and evenly spread meals), hydrate well, include anti-inflammatory foods (fatty fish, walnuts, flax, berries, leafy greens, turmeric, and ginger), and use sleep plus rest/active recovery and gradual progression. For TT, consider extra caution with training volume when adding new exercises, emphasize omega-3 and antioxidant support (with clinician guidance), and monitor if weakness or soreness is unusually severe or persistent. For GT, progress gradually and maintain daily protein and anti-inflammatory nutrition; for GG, standard recovery practices and sensible training scaling are typically sufficient.

What tests can help me learn more about Muscle Damage and IGF-II rs680?

The Functional Health Genetic Test delivers over 750 personalized genetic insights across 10 in-depth genetic reports to support whole-body, systems-level health understanding. The Fitness and Injury Genetic Report translates your results into personalized, actionable guidance. Your healthcare provider can also recommend targeted blood tests based on your specific pathway results and health history to complement your genetic insights with current biomarker data.

Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance. References are included at the end of the article when scientific, medical, or health-related claims are discussed.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.