Long Runs Build Lasting Efficiency: How Training Volume Protects Running Economy
Runners who regularly train long maintain better running efficiency over 90 minutes — and preserve more neuromuscular power — than performance-equal peers.
Summary
A new study from Loughborough University found that well-trained male runners who regularly complete long runs (≥90 min) show significantly better running economy durability than matched runners who keep all runs under 70 minutes. Despite identical 10-km performance times, long-distance trainers experienced only a 3.1% drop in running economy at 90 minutes versus 6.0% for short-distance trainers. They also preserved more leg strength and jump power after the effort. Weekly longest run duration and total training volume were the strongest predictors of this durability advantage, suggesting that how you structure training — not just how fast you are — shapes your ability to sustain efficient movement during prolonged running.
Detailed Summary
Running economy — how much oxygen you consume at a given pace — is a critical determinant of endurance performance. But it's not static: running economy tends to deteriorate during prolonged efforts, a phenomenon called 'running economy durability.' Until now, it was unclear whether specific training habits could protect against this deterioration.
Researchers at Loughborough University recruited 26 well-trained male runners split into two groups: those who regularly ran long (≥90 min) and those who kept all runs under 70 minutes. Critically, both groups were matched for 10-km race performance and VO2max, isolating training structure as the key variable. All participants completed a 90-minute treadmill run at lactate threshold, with respiratory measurements every 15 minutes and neuromuscular tests before and after.
The results were striking. Long-distance trainers experienced roughly half the decline in running economy by 90 minutes (+3.1% vs +6.0%). They also lost significantly less isometric squat force (-12.2% vs -19.4%) and better maintained countermovement jump power (+2.2% vs -6.6%). Weekly longest run duration correlated strongly with better RE durability (r = -0.67), and total training volume also showed a meaningful relationship (r = -0.48).
Interestingly, neuromuscular declines did not directly correlate with running economy changes, suggesting the durability benefit operates through other mechanisms — possibly metabolic adaptations, improved fat oxidation, or connective tissue resilience developed through long-run training.
These findings have direct implications for endurance athletes and coaches: building long runs into weekly training may confer efficiency advantages during races that go beyond what standard performance metrics reveal. However, as a cross-sectional study, causality cannot be confirmed, and intervention trials are needed.
Key Findings
- Long-run trained runners showed only 3.1% RE decline at 90 min vs 6.0% in short-run matched peers.
- Long-distance trainers lost significantly less leg strength and jump power after the 90-min run.
- Weekly longest run duration was the strongest predictor of RE durability (r = -0.67).
- Total training volume also independently predicted better running economy durability (r = -0.48).
- Neuromuscular changes did not directly correlate with RE durability, pointing to other mechanisms.
Methodology
Cross-sectional study of 26 performance-matched well-trained male runners divided by training run duration habits. Participants completed a 90-minute treadmill run at lactate threshold with respiratory gas analysis every 15 minutes and pre/post neuromuscular assessments including isometric squat force and countermovement jump.
Study Limitations
Cross-sectional design prevents causal inference; observed associations may reflect self-selection rather than training effects. The study included only well-trained males, limiting generalizability to females, recreational runners, or other populations. Mechanisms underlying improved RE durability were not directly measured and remain speculative.
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