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European Journal of Applied Physiology

, Volume 115, Issue 4, pp 651–673 | Cite as

Factors affecting the energy cost of level running at submaximal speed

  • Jean-René Lacour
  • Muriel Bourdin
Invited Review

Abstract

Metabolic measurement is still the criterion for investigation of the efficiency of mechanical work and for analysis of endurance performance in running. Metabolic demand may be expressed either as the energy spent per unit distance (energy cost of running, C r) or as energy demand at a given running speed (running economy). Systematic studies showed a range of costs of about 20 % between runners. Factors affecting C r include body dimensions: body mass and leg architecture, mostly calcaneal tuberosity length, responsible for 60–80 % of the variability. Children show a higher C r than adults. Higher resting metabolism and lower leg length/stature ratio are the main putative factors responsible for the difference. Elastic energy storage and reuse also contribute to the variability of C r. The increase in C r with increasing running speed due to increase in mechanical work is blunted till 6–7 m s−1 by the increase in vertical stiffness and the decrease in ground contact time. Fatigue induced by prolonged or intense running is associated with up to 10 % increased C r; the contribution of metabolic and biomechanical factors remains unclear. Women show a C r similar to men of similar body mass, despite differences in gait pattern. The superiority of black African runners is presumably related to their leg architecture and better elastic energy storage and reuse.

Keywords

Muscle–tendon elasticity Stride frequency Vertical stiffness Body mass Calcaneal tuberosity length 

Abbreviations

Cr

Energy cost of running

COM

Center of mass

CV

Coefficient of variation

EMG

Electromyographic activity

kleg

Leg stiffness

kvert

Effective vertical stiffness

L

Leg length

L/S

Leg length-stature ratio

M

Body mass

RE

Running economy

RER

Respiratory exchange ratio

S

Stature

SF

Stride frequency

SL

Stride length

tc

Contact time

Tre

Rectal temperature

vamax

Maximal aerobic running speed

\(\dot{V}{\text{E}}\)

Pulmonary ventilation

\(\dot{V}{\text{O}}_{ 2}\)

Oxygen consumption

\(\mathop V\limits^{.}\!\mathop {\text{O}}\nolimits_{{ 2 {\text{max}}}}\)

Maximal oxygen consumption

\(v\dot{V}{\text{O}}_{ 2{\rm max}}\)

Running speed sustained at \(\dot{V}{\text{O}}_{ 2{\rm max}}\)

WEXT

External work

WINT

Internal work

WTOT

Total work

Notes

Acknowledgments

The authors thank Ian McGill for his review of the manuscript.

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© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Université de LyonLyonFrance
  2. 2.Université Claude Bernard Lyon 1VilleurbanneFrance
  3. 3.IFSTTAR, UMR_T9406LBMC Laboratoire de Biomécanique et Mécanique des ChocsBronFrance
  4. 4.Faculté de Médecine Lyon-Sud Charles MérieuxLBMCOullins CedexFrance

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