Effects of load and gradient on energy cost of running

Daijiro Abe, Yoshiyuki Fukuoka, Satoshi Muraki, Akira Yasukouchi, Yasushi Sakaguchi, Shigemitsu Niihata

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

This study quantified the interaction of electromyography (EMG) obtained from the vastus lateralis and metabolic energy cost of running (Cr; mL· [mass+load]-1· meter-1), an index of running economy, during submaximal treadmill running. Experiments were conducted with and without load on the back on a motor-driven treadmill on the downhill, level and uphill slopes. The obtained EMG was full-wave rectified and integrated (iEMG). The iEMG was divided into eccentric (ECC) and concentric (CON) phases with a foot sensor and a knee-joint goniometer. The ratio of ECC to CON (ECC/CON ratio) was regarded as the muscle elastic capacity during running on each slope. The Cr was determined as the ratio of the 2-min steady-state V̇ O2 to the running speed. We found a significant decrease in the Cr when carrying the load at all slopes. The ECC/CON ratio was significantly higher in the load condition at the downhill and level slopes, but not at the uphill slope. A significant gradient difference was observed in the Cr (down<level<up) and ECC/CON ratio (down=level>uphill). Thus, an alteration of Cr by the gradient and load was almost consistent with that of the ECC/CON ratio. The ECC/CON ratio, but not the rotative torque (T) functioning around the center of body mass, significantly correlated with Cr (r=-0.41, p<0.05). These results indicated that the ECC/CON ratio, rather than T, contributed to one of the energy-saving mechanisms during running with load.

Original languageEnglish
Pages (from-to)153-160
Number of pages8
JournalJournal of physiological anthropology
Volume30
Issue number4
DOIs
Publication statusPublished - Aug 17 2011

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Electromyography
Exercise equipment
energy saving
Goniometers
energy
Costs and Cost Analysis
economy
experiment
Quadriceps Muscle
Torque
Knee Joint
costs
interaction
Muscle
Foot
Costs
Energy conservation
Muscles
Sensors
Experiments

All Science Journal Classification (ASJC) codes

  • Physiology
  • Orthopedics and Sports Medicine
  • Physiology (medical)
  • Public Health, Environmental and Occupational Health
  • Human Factors and Ergonomics
  • Anthropology

Cite this

Abe, D., Fukuoka, Y., Muraki, S., Yasukouchi, A., Sakaguchi, Y., & Niihata, S. (2011). Effects of load and gradient on energy cost of running. Journal of physiological anthropology, 30(4), 153-160. https://doi.org/10.2114/jpa2.30.153

Effects of load and gradient on energy cost of running. / Abe, Daijiro; Fukuoka, Yoshiyuki; Muraki, Satoshi; Yasukouchi, Akira; Sakaguchi, Yasushi; Niihata, Shigemitsu.

In: Journal of physiological anthropology, Vol. 30, No. 4, 17.08.2011, p. 153-160.

Research output: Contribution to journalArticle

Abe, D, Fukuoka, Y, Muraki, S, Yasukouchi, A, Sakaguchi, Y & Niihata, S 2011, 'Effects of load and gradient on energy cost of running', Journal of physiological anthropology, vol. 30, no. 4, pp. 153-160. https://doi.org/10.2114/jpa2.30.153
Abe, Daijiro ; Fukuoka, Yoshiyuki ; Muraki, Satoshi ; Yasukouchi, Akira ; Sakaguchi, Yasushi ; Niihata, Shigemitsu. / Effects of load and gradient on energy cost of running. In: Journal of physiological anthropology. 2011 ; Vol. 30, No. 4. pp. 153-160.
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