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Related Experiment Video

Updated: May 25, 2025

Comparative Analysis of Lower Limb Kinematics between the Initial and Terminal Phase of 5km Treadmill Running
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Fluctuating Running Speed During 10-km Running Elevates Physiological Strain.

Daichi Sumi1, Yasuho Takii1, Satoru Abe1

  • 1Institute of Sport Science, ASICS Corporation, Kobe, Japan.

International Journal of Sports Physiology and Performance
|February 26, 2025
PubMed
Summary

Fluctuating running speed during a 10-km run increases physiological strain, indicated by higher blood lactate levels and ventilation, compared to maintaining a constant pace. This occurs even when overall running time remains the same.

Keywords:
constant paceendurance running performancefluctuating pacelong-distance runnerphysiological response

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • Anecdotal evidence suggests fluctuating running speed negatively impacts performance.
  • The precise effect of speed variation on physiological strain during endurance running is not well understood.

Purpose of the Study:

  • To investigate the impact of fluctuating running speed on physiological strain during a 10-km run.
  • To compare physiological responses between fluctuating and constant running speeds.

Main Methods:

  • Ten male endurance runners participated in two treadmill trials: fluctuating (75-85% V˙O2max) and constant (80% V˙O2max) speed over 10 km.
  • Measured physiological parameters included blood lactate, oxygen uptake (V˙O2), and expired minute ventilation (V˙E).

Main Results:

  • Running time was identical for both fluctuating and constant speed trials (38.6 min).
  • Fluctuating speed resulted in significantly higher exercise-induced blood lactate elevation (4.5 vs. 2.9 mmol/L).
  • Oxygen uptake (V˙O2) and expired minute ventilation (V˙E) were significantly elevated during fluctuating speed running.

Conclusions:

  • Fluctuating running speed increases physiological strain compared to constant speed during a 10-km run.
  • Elevated strain is evidenced by increased blood lactate and ventilation, despite equivalent completion times.