STRUGGL LIVING SCIENCE · PILLAR 05 / 08
VERIFIED DETERMINISTIC CODE + CROSSREF DOIs
Concurrent Training & Interference Tax Engine (6h/3h AMPK-mTOR Clock, Glycogen & 48h Hinge Window)
Direct Citation Summary (TL;DR for Athletes & AI Retrieval Engines):
5 deterministic rules: (1) Same-day gap < 3.0h = high severity, < 6.0h = moderate; (2) Glycogen-depleting run (>= 15km or >= 90min) within 36h before heavy legs; (3) Quality run within 48h after heavy hinge/squat; (4) Back-to-back quality runs <= 24h; (5) Hard run share > 20% (Seiler 80/20 rule).
Validated against Wilson, J. M., Marin, P. J., Rhea, M. R., Wilson, S. M. C., Loenneke, J. P., & Anderson, J. C. (2012). Concurrent training: a meta-analysis examining interference of aerobic and resistance exercises. Journal of Strength and Conditioning Research, 26(8), 2293-2307. (
10.1519/JSC.0b013e31823a3e2d)
and executed deterministically in the Struggl Concurrent Interference Subsystem.
1. Interactive Deterministic Calculator
2. Verifiable Reference Benchmark Table
Pre-computed directly from the Struggl Concurrent Interference Subsystem (check):
| Rule ID (Interference Subsystem) | Constant / Threshold | Trigger Condition | Severity | Biomolecular / Biomechanical Mechanism | Primary Literature DOI |
|---|---|---|---|---|---|
| `same_day_proximity` (Critical) | `MIN_SEPARATION_H = 3.0` | Endurance + Lower-Body Strength separated by `< 3.0 hours` | HIGH (-25 pts) | Acute AMPK / SIRT1 activation phosphorylates TSC2 & Raptor, blunting mTORC1 myofibrillar protein synthesis for ~3h post-run. | Robineau et al. 2016 (`10.1519/JSC.0000000000000798`) |
| `same_day_proximity` (Sub-Optimal) | `RECOMMENDED_SEPARATION_H = 6.0` | Endurance + Lower-Body Strength separated by `3.0 to 5.9 hours` | MODERATE (-12 pts) | Residual central nervous system (CNS) & peripheral fatigue reduces rate of force development (RFD) and motor-unit recruitment. | Wilson et al. 2012 (`10.1519/JSC.0b013e31823a3e2d`) |
| `glycogen_depletion_before_legs` | `DEPLETING_KM = 15.0` / `DEPLETING_MIN = 90.0` | Long run (`>= 15 km` or `>= 90 min`) within `0–36h` BEFORE heavy legs | HIGH (-25 pts) | Local vastus lateralis glycogen depletion (<150 mmol/kg dw) impairs sarcoplasmic reticulum Ca2+ release and reduces squat/leg-press volume by 15–22%. | Schumann et al. 2022 (`10.1007/s40279-021-01587-7`) |
| `hinge_eccentric_window` | `HINGE_RECOVERY_H = 48.0` | Quality run (`threshold` / `intervals` / `tempo`) within `0–48h` AFTER heavy Hinge/Squat | MODERATE (-12 pts) | Eccentric sarcomere Z-disk micro-damage in hamstrings/glutes alters stride kinematics and elevates running economy oxygen cost by 3–7%. | Fyfe et al. 2014 (`10.1007/s40279-014-0162-1`) |
| `polarization_drift` | `HARD_SHARE_CEILING = 0.20` | Weekly hard endurance sessions (`> VT2 / Zone 4–5`) exceed `20%` of total runs (`>= 4` runs/wk) | LOW (-5 pts) | Autonomic sympathetic overload ('Zone 3 black hole') degrades heart rate variability (HRV) without superior VO2max gain. | Seiler 2010 (`10.1123/ijspp.5.3.276`) |
3. Exact Deterministic Equations (Zero-LLM-Math Architecture)
5 deterministic rules: (1) Same-day gap < 3.0h = high severity, < 6.0h = moderate; (2) Glycogen-depleting run (>= 15km or >= 90min) within 36h before heavy legs; (3) Quality run within 48h after heavy hinge/squat; (4) Back-to-back quality runs <= 24h; (5) Hard run share > 20% (Seiler 80/20 rule).
Public API endpoint `/v1/public/tax` scoring a weekly hybrid schedule from 0-100.
4. Peer-Reviewed Scientific Evidence & CrossRef DOIs (1,104-Paper Corpus)
| Study / Citation | DOI / Identifier | Mechanistic Role in Struggl Engine |
|---|---|---|
| Wilson, J. M., Marin, P. J., Rhea, M. R., Wilson, S. M. C., Loenneke, J. P., & Anderson, J. C. (2012). Concurrent training: a meta-analysis examining interference of aerobic and resistance exercises. Journal of Strength and Conditioning Research, 26(8), 2293-2307. | 10.1519/JSC.0b013e31823a3e2d |
Quantifies running vs cycling hypertrophy/power interference (running ES = 0.68 vs cycling ES = 0.99; power ES = 0.55 vs 0.91). |
| Robineau, J., Babault, N., Piscione, J., Lacome, M., & Bigard, A. X. (2016). Specific Training Effects of Concurrent Aerobic and Strength Exercises Depend on Recovery Duration. Journal of Strength and Conditioning Research, 30(3), 672-683. | 10.1519/JSC.0000000000000798 |
Proves 0h vs 6h vs 24h recovery intervals govern strength and hypertrophy attenuation. |
| Schumann, M., Feuerbacher, J. F., Sünkeler, M., Freitag, N., Rønnestad, B. R., Doma, K., & Lundberg, T. R. (2022). Compatibility of Concurrent Aerobic and Strength Training for Skeletal Muscle Size and Function: An Updated Systematic Review and Meta-Analysis. Sports Medicine, 52(3), 601-612. | 10.1007/s40279-021-01587-7 |
Updated meta-analysis showing whole-body hypertrophy is preserved when sessions are separated >=3-6h, while explosive strength remains sensitive to same-session order. |
| Seiler, S. (2010). What is best practice for training intensity and duration distribution in endurance athletes? International Journal of Sports Physiology and Performance, 5(3), 276-291. | 10.1123/ijspp.5.3.276 |
Establishes the 80/20 polarized intensity distribution rule (`HARD_SHARE_CEILING = 0.20`). |
| Wilson et al. (2012) — Concurrent training: a meta-analysis examining interference of aerobic and resistance exercises. (Journal of strength and conditioning research) | 10.1519/jsc.0b013e31823a3e2d |
Cited in 3 Nippard audit video(s) |
| Murlasits et al. (2018) — The physiological effects of concurrent strength and endurance training sequence: A systematic review and meta-analysis. (Journal of sports sciences) | 10.1080/02640414.2017.1364405 |
Cited in 2 Nippard audit video(s) |
| Petré et al. (2021) — Development of Maximal Dynamic Strength During Concurrent Resistance and Endurance Training in Untrained, Moderately Trained, and Trained Individuals: A Systematic Review and Meta-analysis. (Sports medicine (Auckland, N.Z.)) | 10.1007/s40279-021-01426-9 |
Cited in 1 Nippard audit video(s) |
| Jones et al. (2016) — Performance and Endocrine Responses to Differing Ratios of Concurrent Strength and Endurance Training. (Journal of strength and conditioning research) | 10.1519/jsc.0000000000001135 |
Cited in 1 Nippard audit video(s) |
| Rosa et al. (2015) — Order effects of combined strength and endurance training on testosterone, cortisol, growth hormone, and IGF-1 binding protein 3 in concurrently trained men. (Journal of strength and conditioning research) | 10.1519/jsc.0000000000000610 |
Cited in 1 Nippard audit video(s) |
| Fyfe et al. (2014) — Interference between concurrent resistance and endurance exercise: molecular bases and the role of individual training variables. (Sports medicine (Auckland, N.Z.)) | 10.1007/s40279-014-0162-1 |
Cited in 1 Nippard audit video(s) |
5. Frequently Asked Questions
How many hours should you wait between running and lifting weights?
Based on Robineau et al. (2016, DOI: 10.1519/JSC.0000000000000798) and Wilson et al. (2012, DOI: 10.1519/JSC.0b013e31823a3e2d), separating endurance and lower-body strength sessions by at least 6 hours (RECOMMENDED_SEPARATION_H = 6.0) eliminates the acute AMPK-mTOR molecular interference effect. Gaps under 3 hours (MIN_SEPARATION_H = 3.0) trigger high interference.