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7 min readrunning / training

14% less force at the kneecap: how to raise your running cadence

I run about 5,000 km a year, and the cadence tip I hear most often is a single number: 180 steps per minute. No study supports 180 as a target for every runner. Researchers have measured something else, and it is more useful: what happens to your joints when you raise your own step rate by 5% to 10%.

A 10% faster step rate takes load off the knee.

Heiderscheit and colleagues put 45 recreational runners on a treadmill at a fixed speed, then had them run at their preferred step rate and at plus or minus 5% and 10% of it 1. The knee absorbed less mechanical energy at both plus 5% and plus 10%. The hip absorbed less only at plus 10%. Step length, vertical travel of the center of mass, braking impulse and peak knee flexion all fell as step rate rose. Cutting step rate by 10% raised energy absorption at every joint they measured.

Lenhart and colleagues ran 30 adults on an instrumented treadmill at 90%, 100% and 110% of preferred step rate and drove a musculoskeletal model with the motion 2. Peak patellofemoral joint force dropped 14% in the 110% condition. The strongest predictor of that drop was peak knee flexion during stance, since a shorter step lands with a straighter knee. The same group later modeled cartilage contact in 22 runners and found mean patellofemoral contact pressure down 10.4% and contact area down 7.4% at the same 10% increase 3.

Bone gets a smaller effect. Edwards and colleagues modeled tibial stress fracture probability across stride lengths and weekly mileage 4. Taking 10% off stride length lowered the modeled probability by 3% to 6%. Adding mileage raised it by 4% to 10%. Their recommendation was explicit: a runner who wants to reduce tibial stress fracture probability can cut stride length by 10%.

Anderson, Martin, Barton and Bonanno pooled 37 studies on step rate changes 5. They graded the evidence strong for a reduced peak knee flexion angle when step rate goes up (SMD 0.66, 95% CI 0.40 to 0.92), moderate for reduced step length (0.93), peak hip adduction (0.40), peak knee extensor moment (0.50) and foot strike angle (0.62), and limited for reduced negative work at the hip (0.55) and the knee (0.84). Raise step rate and the loading numbers fall or hold flat. Lower it and they rise or hold flat.

The pain evidence rests on one case series.

Joint loading is a mechanism, not an outcome. Bramah and colleagues recruited runners with patellofemoral pain, raised their step rate 10% in a single session with an audible metronome, then sent them out to self-monitor with a GPS watch and the metronome 6. Worst pain in the past week and the Lower Extremity Functional Scale both improved at 4 weeks and held at 3 months. It is a case series with no control group, graded level 4 evidence.

That study carries the clinical case on its own. The 2022 review rated the pain effect as very limited evidence, SMD 2.68 (1.52 to 3.83) at 4 weeks and 3.62 (2.24 to 4.99) at 12 weeks, with function at 2.31 (1.24 to 3.39) at 4 weeks, and concluded that the evidence does not settle what step rate changes do to injury or performance 5. Effect sizes above 2 from one uncontrolled series are grounds to try the intervention on yourself, well short of proof.

The longest follow-up in the literature comes from walking. The Multicenter Osteoarthritis Study measured walking step rate in 1,089 older adults and scored their knee cartilage on MRI two years later 7. Women in the lowest step rate group carried 2.1 times the risk (95% CI 1.1 to 3.8) of worsening lateral patellofemoral cartilage damage and 1.8 times the risk (1.1 to 2.9) in the lateral tibiofemoral compartment, against the highest group. Observational data, walking rather than running, in a cohort at risk of osteoarthritis. It transfers to your long run loosely at best.

The cost side.

Ibe, Musci and Roper raised step rate 7.5% in collegiate runners 8. Oxygen cost and energetic cost did not separate from baseline, and neither did predicted race speed, though the average predicted speed fell about 1%. The 2022 review also found that higher step rates came with more perceived exertion, awkwardness and effort 5. A change that feels worse and may cost 1% of speed has no place in a race week.

One study argues for a modest increase over a large one. De Ruiter and colleagues set stride frequency by metronome across seven rates, 18% either side of self-selected, for 10 novice and 10 trained men, and located each runner's metabolic minimum 9. Both groups ran below their own optimum: novices at 77.8 strides per minute against an optimum of 84.9, trained runners at 84.4 against 87.1. That leaves roughly 8% of headroom for a beginner and 3% for a trained runner. Past the minimum, the oxygen cost climbs again.

The protocol.

  1. Measure the baseline before changing anything. At easy pace, count right-foot strikes for 60 seconds and double the number. Repeat on three separate runs at the same pace and take the median. A watch cadence field does the job if you trust the sensor.
  2. Set the target at baseline plus 5%, with plus 10% as the ceiling. From 164 steps per minute that is 172 to 180. From 150 it is 158 to 165. Ignore 180 unless your own arithmetic lands there.
  3. Hold the pace. The entire effect comes from shortening the step at the same speed, so keep your pace field in view during cued blocks. If the pace drifts faster, you have added speed instead of taking length out of the stride.
  4. Cue with sound. A metronome app at the target rate, or a playlist at that BPM. Bramah's runners used a metronome plus watch feedback, the only version of this with a 3-month follow-up 6.
  5. Build over 4 weeks on easy runs only. Week 1: two runs with 4 cued blocks of 5 minutes. Week 2: 6 blocks. Week 3: one continuous cued easy run. Week 4: both easy runs cued. Leave interval and tempo sessions alone, since step rate climbs with speed on its own.
  6. Add the cue to a long run in week 5 at the earliest, and only for the first 30 minutes. Fatigue degrades the pattern before it is automatic.
  7. Re-measure at week 6, uncued, at your baseline pace. Holding plus 5% or more means the pattern took. Below that, run another 4 weeks with the metronome before you call it a failure.
  8. Fall back to plus 5% if your easy runs start feeling harder at the same pace, or if you shorten a run to escape the metronome.

Skip all of this if your knees and shins have never given you trouble. The measured payoff is lower load at the knee and a modeled drop in tibial stress fracture probability, which buys you nothing when neither is where you break down. Log the number next to your weekly volume, since mileage moved risk further than stride length did in Edwards' model 4.

Sources.

  1. Heiderscheit BC, Chumanov ES, Michalski MP, Wille CM, Ryan MB (2011). Effects of step rate manipulation on joint mechanics during running. Medicine & Science in Sports & Exercise 43(2), 296-302. doi:10.1249/MSS.0b013e3181ebedf4
  2. Lenhart RL, Thelen DG, Wille CM, Chumanov ES, Heiderscheit BC (2014). Increasing running step rate reduces patellofemoral joint forces. Medicine & Science in Sports & Exercise 46(3), 557-564. doi:10.1249/MSS.0b013e3182a78c3a
  3. Lenhart RL, Smith CR, Vignos MF, Kaiser J, Heiderscheit BC, Thelen DG (2015). Influence of step rate and quadriceps load distribution on patellofemoral cartilage contact pressures during running. Journal of Biomechanics 48(11), 2871-2878. doi:10.1016/j.jbiomech.2015.04.036
  4. Edwards WB, Taylor D, Rudolphi TJ, Gillette JC, Derrick TR (2009). Effects of stride length and running mileage on a probabilistic stress fracture model. Medicine & Science in Sports & Exercise 41(12), 2177-2184. doi:10.1249/MSS.0b013e3181a984c4
  5. Anderson LM, Martin JF, Barton CJ, Bonanno DR (2022). What is the effect of changing running step rate on injury, performance and biomechanics? A systematic review and meta-analysis. Sports Medicine - Open 8, 112. doi:10.1186/s40798-022-00504-0
  6. Bramah C, Preece SJ, Gill N, Herrington L (2019). A 10% increase in step rate improves running kinematics and clinical outcomes in runners with patellofemoral pain at 4 weeks and 3 months. American Journal of Sports Medicine 47(14), 3406-3413. doi:10.1177/0363546519879693
  7. Hart HF, Gross KD, Crossley KM, Barton CJ, Felson DT, Guermazi A, Roemer F, Segal NA, Lewis CE, Nevitt MC, Stefanik JJ (2020). Step rate and worsening of patellofemoral and tibiofemoral joint osteoarthritis in women and men: the Multicenter Osteoarthritis Study. Arthritis Care & Research 72(1), 107-113. doi:10.1002/acr.23864
  8. Ibe O, Musci RV, Roper JL (2024). Running economy changes alter predicted running speed and performance in collegiate runners. International Journal of Exercise Science 17(1), 965-974. PubMed 39253097
  9. de Ruiter CJ, Verdijk PWL, Werker W, Zuidema MJ, de Haan A (2014). Stride frequency in relation to oxygen consumption in experienced and novice runners. European Journal of Sport Science 14(3), 251-258. doi:10.1080/17461391.2013.783627

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