Increasing step rate 5–10% cuts the energy absorbed per stride at the knee (and, at +10%, the hip)
A load-redistribution tool for runners
Participants
n=45 healthy recreational runners; 3-D kinematics and kinetics recorded during treadmill running at constant speed at preferred step rate, ±5% and ±10%.
Protocol
Within-subject laboratory study: 45 healthy recreational runners on a treadmill at constant speed (from the abstract)
Step rate conditions: preferred, ±5% and ±10%
Measures: three-dimensional kinematics and kinetics; primary hypothesis — less energy absorbed by the lower-extremity joints during the loading response, mainly at the knee, when step rate is increased
Key Findings
Knee: less mechanical energy absorbed at both +5% and +10% step rate. Hip: less energy absorbed at +10% only. Reducing step rate by 10% increased energy absorption at all joints.
With increasing step rate, step length, vertical centre-of-mass excursion, braking impulse and peak knee-flexion angle all decreased.
At +10%, peak hip-adduction angle and the hip-adduction and internal-rotation moments decreased.
Authors' conclusion: subtle increases in step rate can substantially reduce hip and knee loading and may help prevent and treat common running injuries. Injury outcomes were not measured.
Not from this paper (related work; each summary checked against that paper's own abstract): Napier 2015 systematic review of 27 gait-modification studies (DOI 10.1136/bjsports-2014-094393) — foot-strike manipulation had the largest effect on kinematics, real-time feedback on kinetics, combined protocols on spatiotemporal variables; effects are short-term, small-to-large.Willy 2012 (DOI 10.1016/j.clinbiomech.2012.07.011) — mirror feedback over 8 sessions in 10 female runners with patellofemoral pain reduced peak hip adduction, contralateral pelvic drop and hip-abduction moment, largely maintained at 1 and 3 months (pain outcomes not checked against the abstract).
Practical Application
In 45 healthy recreational runners, raising step rate 5–10% at the same speed reduced the energy absorbed at the knee (and at the hip at +10%) and reduced peak knee flexion and hip adduction. For knee (PFP) or hip load-sensitivity: cue +5–10% cadence (metronome/watch) at the same easy pace; retrain gradually over weeks.
Not from this paper; the base's own practice: avoid abrupt forefoot-strike conversion, which moves load toward the ankle/Achilles and forefoot.
Limitations
Acute lab study; does not test injury incidence; n=45 healthy runners; long-term adherence and clinical outcomes need trials. Metabolic cost was not measured here.
How this entry was checked and changed
Content correction 2026-09-27
PMID 20581716 -> 20581720 (the old PMID pointed to an unrelated paper; the DOI was always correct).
"Beyond ~10% adds metabolic cost with diminishing benefit" removed — not measured in this study.
"Hip reductions grew from +5% to +10%" -> hip energy absorption fell at +10% only; knee at both +5% and +10%. Added braking impulse, and the hip internal-rotation moment, from the abstract; "ankle least affected" removed (not in the abstract).
Napier 2015 and Willy 2012 summaries rewritten to match their abstracts; the forefoot-strike warning relabelled as the base's own practice.
2026-09-28: added Protocol from the abstract (Europe PMC/PubMed PMID 20581720).