Recovery & Injury
The big-five running injuries, return-to-run protocols, mobility, HRV, taper.
23 articles · sorted by most recent
Alcohol and Endurance Training Recovery: What the Research Actually Says About the Post-Long-Run Beer
One or two drinks (about 0.5 g/kg) rarely dent muscle recovery. The scary results used about 12 drinks. Sleep is the weak spot, even at low doses.
Iron Deficiency Without Anemia: What Ferritin Level Actually Hurts Endurance Performance?
Low iron can cost endurance athletes 3-4% of performance even with normal hemoglobin. But trials show benefit from iron mostly at ferritin of 20 or below, and about half were negative.
How to Return to Training After an Injury Without Getting Hurt Again
Restart from the fitness you have now, not your old peak. Short breaks cost about 4-14% of VO2max, and the 10% rule didn't cut injuries in a 532-runner trial.
How to Rebuild After an Injury Mid-Marathon Block Without Re-Injuring Yourself
Two weeks off costs a marathoner roughly 6% in finish time, about 14 minutes at 4:00. Re-entering at your old mileage costs more. Here is the pain rule, the run-walk steps, and the goal-race decision table.
What to Do the Week After Your Marathon: A Recovery Plan That Gets You Back Faster
Seven days after a marathon your aerobic fitness has barely moved, but 12.9% of runners in one big study reported an infection that week. Walk first, jog easy from about day 4.
Sick Before Your Marathon: The Neck Check, What to Skip, and When to Resume Training
A stuffy nose rarely ends a marathon build, but fever can. Learn the neck check, why 12 days off costs about 7% of VO2max, and a 4-step ladder back to training.
Exercise-Induced Bronchoconstriction in Endurance Athletes: The Airway Problem Capping Your VO2max
Exercise-induced bronchoconstriction hits 11-50% of athletes, far above the general population, and most cases go undiagnosed because symptoms alone can't confirm it.
Deep Water Running for Injured Runners: The 4-6 Week Window Where It Actually Works
Deep water running holds VO2max steady for 4-6 weeks in controlled studies, but bone stress injuries average 11.7-13.3 weeks off running, a real gap most advice ignores.
Training for Endurance Racing on a Night-Shift Schedule: The Circadian Rules That Actually Matter
Endurance capacity only swings 3-5% by time of day, but training on under 4 hours of sleep cuts your time-to-exhaustion by 29%. Here's what shift workers actually need to worry about.
Return to Running After ACL Reconstruction: The Criterion-Based Timeline That Beats a Calendar Date
The evidence-backed clearance window for running after ACL reconstruction spans 5 to 39 weeks, median 12. Passing strength, hop, and confidence tests predicts safety far better than a date.
Collagen and Vitamin C for Tendon Health: The Timing Protocol Runners Get Wrong
A 2023 trial found 15 g of collagen was no better than placebo for tendon synthesis. Only 30 g worked, and only when timed within an hour of loading.
Testosterone:Cortisol Ratio and Overreaching: Why the 30% Rule Gets It Wrong
A T:C ratio drop over 30% is the classic overtraining flag, but a 2026 review says it can't diagnose anything alone, and one study found higher ratios predicted worse finishes.
Ice Baths Blunt Strength Gains, Not Endurance Gains: What the 2026 Research Shows
Ice baths after leg day cut muscle growth by up to 85%. The same cold plunge after a run or ride shows no measurable loss in aerobic gains, per an 87-study 2026 meta-analysis.
Does Training Time of Day Matter? Morning vs Evening Endurance Performance
Evening-type athletes finish marathons about 13.9 minutes slower than morning types at the same 7am start. Here's the size of your circadian gap, and how to close it.
Do Eccentric Heel Drops Work? The 2026 Data on Achilles and Patellar Tendinopathy Non-Responders
Up to 45% of patients don't respond to eccentric heel drops for Achilles tendinopathy, and the right next step depends on the tendon and the protocol you switch to.
Long COVID and Endurance Training: The Return-to-Sport Protocol When HRV Won't Recover
Long COVID keeps HRV suppressed for months and a third of athletes never return to their old fitness. Here's the VT1 pacing ceiling that actually works.
Does Heat Acclimation Improve Running Economy, or Just VO2max?
Ten days of heat training lifted cool-weather VO2max 5% and time-trial output 6% in one trial. The mechanism is plasma volume, not a cleaner running stride.
Ultramarathon Inflammation: IL-6 Peaks in Hours, CRP Takes Days — Why You're Resuming Hard Training Too Soon
IL-6 clears in 24–48 hours after an ultra — but CRP, the marker that tracks actual tissue repair, stays 8x above baseline on Day 7. Your legs feel fine. Your blood disagrees.
The 10% Weekly Mileage Rule Is Wrong — What 23,047 Runners Actually Show
The 10% rule has no founding research paper. A 532-person RCT found zero benefit. Here's what the real injury data says you should do instead.
Am I Overtraining? 7 Signs the Research Says Actually Predict Overtraining Syndrome
64% of male endurance runners hit overtraining syndrome at least once. Here are the 7 research-validated signs — with specific thresholds — that separate real OTS from normal fatigue.
Does AI Running Coaching Cause Injuries? The 2026 Data, the Runna Story, and What to Watch For
AI running apps aren't inherently dangerous — but the injury risk is real when load guardrails are absent. Here's the ACWR data, the Runna pattern, and 8 numbers every runner needs.
Return to Run After a Bone Stress Injury: The Evidence-Based 6-Phase Protocol
MRI grade predicts return-to-run timeline with r=0.554 — Grade 1 averages 42 days, Grade 4 averages 99 days. Skipping phases risks recurrence rates up to 29%.
HRV Readiness: Why the Daily Score Is Noise and the 7-Day Trend Is the Signal
Your morning HRV score is dominated by noise — daily RMSSD swings 10–20% from alcohol, sleep position, and measurement error alone. The 7-day rolling trend is what actually predicts readiness.