PaceBrain blog
Research backed insights for runners.
We read the papers so you do not have to. Each article is grounded in primary research with full citations. No marketing fluff.
Garmin bought TrainingPeaks. Here's what it actually means for self-coached runners.
Garmin acquired TrainingPeaks and TrainHeroic on 22 July 2026. What was actually announced, what did not change (device compatibility, for one), and the question worth asking if you train without a coach.
Running Economy: What It Is and How to Improve It
Running economy is the oxygen cost of holding a given pace, and it is trainable. We review what the evidence says about improving it through heavy strength work, plyometrics, technique and altitude, with honest notes on how large the gains really are.
VO2max Intervals: The Science of High-Intensity Running
VO2max intervals raise aerobic capacity more reliably than steady running, but research shows the length of each work bout matters more than sheer intensity. Here is what the evidence supports on interval design, trainability and where it stays uncertain.
Plyometrics for Runners: Do Jumps Make You Faster?
Jump training can make runners modestly faster, mainly by improving running economy rather than aerobic capacity. We work through the meta-analyses on time-trial gains, why a springier leg helps, how plyometrics compare with heavy lifting, and where the evidence is genuinely mixed.
Hill Training for Runners: What the Research Shows
Uphill intervals and hill sprints have controlled-trial support for improving running economy, leg stiffness and race performance, while downhill running builds eccentric resilience rather than shortcutting economy gains. We review eight studies and set out where the evidence is solid and where it stays mixed.
Foam Rolling for Runners: Does It Actually Work?
Foam rolling for runners reliably improves short-term flexibility and can ease muscle soreness after hard sessions, but the evidence that it directly boosts running performance is weak. Here is what the meta-analyses and runner-specific trials actually show, and how to use a roller sensibly.
Compression Garments for Runners: The Evidence
Do compression socks and tights actually help runners? We weigh the evidence from seven controlled studies and reviews: little benefit for race performance, but a more defensible case for recovery from muscle damage after hard efforts.
Forefoot vs Heel Strike: Is One Really Better?
Is forefoot running better than heel striking? The evidence says neither is clearly superior. Forefoot striking cuts impact loading but raises ankle and Achilles load, and does not improve running economy. We review the research and explain when changing foot strike is actually worth it.
Barefoot and Minimalist Running: What the Evidence Says
Barefoot and minimalist running clearly changes your form, but does it prevent injury or make you faster? We weigh the randomised trials and reviews, and find the evidence weaker and more mixed than the marketing suggests.
Altitude Training for Runners: Does Live High, Train Low Work?
Live high, train low is the best-supported altitude method for runners, but the average gain is around one percent and varies widely between individuals. We review the controlled trials, the responder problem, the dose question and where the VO2max evidence conflicts.
Tart Cherry Juice for Runners: What the Recovery Evidence Says
Tart cherry juice is one of the better-evidenced recovery aids for runners, but the effect is modest. We review the placebo-controlled trials and meta-analyses on strength recovery, soreness and performance, and flag where the evidence is weak or mixed.
Sodium Bicarbonate for Runners: Does Baking Soda Work?
Baking soda is a legal, cheap and well-studied buffer, but does it make runners faster? We weigh the evidence: a small edge for middle-distance and interval running, a negligible effect for longer distances, and a real risk of gut trouble.
Iron Deficiency in Runners: Symptoms, Testing and Evidence
Low iron can blunt a runner's endurance long before it shows as anaemia. Here is what the trial evidence says about symptoms, ferritin testing, safe supplementation and dose timing, plus honest caveats on who actually needs to test.
Vitamin D for Runners: Performance, Bones and Evidence
Correcting a real vitamin D deficiency supports runners' bone health, muscle recovery and winter immunity, but topping up when already sufficient will not make you faster. A measured look at what the trials actually show, and where the evidence stays weak.
Collagen for Tendons: Can It Protect Runners?
Can collagen strengthen a runner's tendons and prevent injury? We review the controlled trials on collagen peptides, dosing and timing, and separate the real tendon-size effects from the injury-prevention claims the evidence does not yet support.
Gut Training: How to Stop GI Distress on Long Runs
GI distress derails many long runs, but the gut is trainable. We cover the two-week feeding protocol that roughly halves symptoms, why glucose-fructose blends absorb better, and where a short low-FODMAP phase fits, with honest caveats on weak evidence.
Running for Mental Health: What the Research Shows
Randomised trials now place running alongside psychotherapy and medication for depression, with a smaller but real benefit for anxiety. We break down the effect sizes, how running compares with antidepressants, whether it is truly causal, and the honest caveats.
Bone Density and Stress Fractures in Runners: The Evidence
The strongest predictors of a running stress fracture are a previous one and female sex. We review what the evidence says about bone density, the female athlete triad, calcium and vitamin D, cadence and injury severity, with honest caveats throughout.
Carbohydrate Mouth Rinse: Can Swilling a Sports Drink Make You Faster?
Swilling a sports drink without swallowing can produce a small, real performance gain by signalling the brain rather than fuelling the muscles. We review what the evidence says, how it works, and when a carbohydrate mouth rinse actually helps runners.
The Dynamic Warm-Up for Runners: What the Evidence Supports
Dynamic stretching before a run is one of the better-supported warm-up practices, tending to lift performance while long static holds can blunt it. We weigh the trials, the mixed running-economy evidence, and how to build a practical routine.
Overtraining Syndrome in Runners: Signs and Prevention
Overtraining syndrome is a months-long performance decline from too much load and too little recovery, and no blood test or wearable confirms it. Here is how to recognise the early warning signs, why subjective monitoring beats gadgets, and what the evidence supports for prevention.
Carbon plate super shoes: do they actually make you faster?
Super shoes promise free speed, and the lab evidence for a ~4 percent running economy gain is unusually strong. Here is whether that becomes a faster race, and why some runners respond far more than others.
Does running ruin your knees? What the research says about arthritis
The fear that running wears out your knees is one of fitness’s most persistent myths. The evidence shows recreational running is linked to healthier joints, not damaged ones.
Does running make you live longer? The evidence on running and longevity
Large cohort studies tie running to lower all-cause and cardiovascular mortality, with even a few minutes a day helping. The evidence on the minimum dose, the disputed U-shaped curve, and the roughly three extra years runners gain.
Ice baths for runners: does cold water immersion actually help?
Cold water immersion does reduce post-run soreness, but regular use can blunt long-term strength and muscle adaptations. The trick is knowing when an ice bath helps a runner and when it quietly works against you.
Creatine for runners: does it help endurance performance?
Creatine is the best-evidenced supplement in sport, but its case for distance running is indirect. What the research really shows for runners, the honest caveats, and how to dose it.
Carb loading for a marathon: the science of fuelling up
Carb loading tops up muscle glycogen so the wall arrives later. The modern 1 to 3 day protocol, how many carbs to aim for, and why the scales go up.
How many carbs per hour should you eat during a long run?
Carbohydrate intake guidelines scale with how long you run: 30 to 60 g/hr up to two hours, 60 to 90 g/hr beyond. The glucose plus fructose science, the gut training, and the gel maths.
Caffeine and running performance: what the research shows
Caffeine is one of the best-evidenced legal ergogenic aids in endurance sport. The effective dose, the timing, the mechanism, and why the habituation worry is a myth.
Beetroot juice for runners: does dietary nitrate actually work?
Beetroot juice is one of the few legal supplements with real evidence behind it. How dietary nitrate lowers running’s oxygen cost, the dose that works, and why it does less for fast runners.
Protein for runners: how much you really need for recovery
Runners need more protein than the old 0.8 g/kg advice suggests. What the research says about daily targets, per-meal doses, timing, and eating food first.
Hydration for runners: how much to drink and the hyponatremia risk
The modern consensus is drink to thirst, not on a schedule. Why overdrinking, not dehydration, is the bigger hazard for slower marathoners, plus electrolytes and sweat rate.
Running cadence: does 180 steps per minute really matter?
The 180 steps-per-minute rule came from one observation at the 1984 Olympics, not a universal law. What the research really shows about cadence, overstriding and injury.
Heart rate zones for running, explained
The five-zone model and what each zone trains, why 220 minus age is a poor estimate of max heart rate, and how reserve and threshold testing build zones you can trust.
Lactate threshold: the most important number in distance running?
Lactate is a fuel, not a waste product. What LT1 and LT2 really mean, why the fraction of VO2max you can sustain predicts race times better than VO2max alone, and how to find your threshold without a lab.
The long run: how long and how slow it should be
The long run is the cornerstone of endurance, yet most runners run it too fast and cut it too short. How long it should be and how slow it should feel.
Negative splits: the pacing strategy that wins races
Negative, even and positive splits explained. The science shows even or slightly negative pacing wins, while going out too fast is the costliest amateur mistake.
Does stretching prevent running injuries? An evidence check
Static stretching before a run does not meaningfully cut injury risk and can briefly blunt power. What the evidence shows, and what actually keeps runners healthy.
Sleep and running performance: the most underrated training tool
You get fitter while you sleep, not while you run. What the research says about sleep extension, sleep loss, injury risk, and how much sleep runners really need.
Running in the heat: how to acclimatise and keep performing
Heat drives up core temperature and cardiovascular strain, slowing every runner down. How acclimatisation works, what it changes, and how to pace, cool and hydrate when it is hot.
The menstrual cycle and running: training with your physiology
On average the menstrual cycle barely affects running performance, but individual variation is large and symptoms matter. The honest, evidence-led case for tracking your own response over rigid cycle syncing.
Zone 2 training for runners: what the research actually shows
Zone 2 is the most talked about intensity in running. Here is what the science says it does, how to find your real Zone 2, and why a heart rate percentage is the wrong way to do it.
VO2max for runners: what it is, what is good, and how to improve it
VO2max is the most quoted number in running and the most misunderstood. What counts as a good value, how much you can realistically change it, and the training that actually works.
How to taper for a race: what the research says about the final weeks
A good taper is worth two to three percent of your finish time, but most runners do it wrong. The evidence on how long to taper, how much to cut, and what never to touch.
Strength training for runners: does lifting actually make you faster?
The research is unusually clear. Two to three sessions of heavy and explosive lifting a week improves running economy and race times, without adding bulk, and cuts injury risk.
Why most runners train too fast on easy days
Two decades of research on elite endurance athletes points to an 80/20 split between easy and hard work. Most recreational runners do the opposite, and pay for it in fatigue, stagnation, and injury.
How accurate are race time predictors? An honest look at the research
Every running app gives you a finish time. Behind that number are formulas with real limits, and a confidence range your predictor probably is not telling you about.