Total power output generated during dynamic knee extensor exercise at different contraction frequencies

R. A. Ferguson, P. Aagaard, D. Ball, A. J. Sargeant, J. Bangsbo

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

A novel approach has been developed for the quantification of total mechanical power output produced by an isolated, well-defined muscle group during dynamic exercise in humans at different contraction frequencies. The calculation of total power output comprises the external power delivered to the ergometer (i.e., the external power output setting of the ergometer) and the 'internal' power generated to overcome inertial and gravitational forces related to movement of the lower limb. Total power output was determined at contraction frequencies of 60 and 100 rpm. At 60 rpm, the internal power was 18 ± 1 W (range: 16-19 W) at external power outputs that ranged between 0 and 50 W. This was less (P < 0.05) than the internal power of 33 ± 2 W (27-38 W) at 100 rpm at 0-50 W. Moreover, at 100 rpm, internal power was lower (P < 0.05) at the higher external power outputs. Pulmonary oxygen uptake was observed to be greater (P < 0.05) at 100 than at 60 rpm at comparable total power outputs, suggesting that mechanical efficiency is lower at 100 rpm. Thus a method was developed that allowed accurate determination of the total power output during exercise generated by an isolated muscle group at different contraction frequencies.

Original languageEnglish
Pages (from-to)1912-1918
Number of pages7
JournalJournal of Applied Physiology
Volume89
Issue number5
Publication statusPublished - 2000

Fingerprint

Knee
Muscles
Lower Extremity
Oxygen
Lung

Keywords

  • Contraction velocity
  • Internal power
  • Internal work
  • Mechanical efficiency
  • Muscle moment
  • Quadriceps

ASJC Scopus subject areas

  • Physiology
  • Endocrinology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Total power output generated during dynamic knee extensor exercise at different contraction frequencies. / Ferguson, R. A.; Aagaard, P.; Ball, D.; Sargeant, A. J.; Bangsbo, J.

In: Journal of Applied Physiology, Vol. 89, No. 5, 2000, p. 1912-1918.

Research output: Contribution to journalArticle

Ferguson, R. A. ; Aagaard, P. ; Ball, D. ; Sargeant, A. J. ; Bangsbo, J. / Total power output generated during dynamic knee extensor exercise at different contraction frequencies. In: Journal of Applied Physiology. 2000 ; Vol. 89, No. 5. pp. 1912-1918.
@article{9e1baa3dc837468fb3501fa3bedf9049,
title = "Total power output generated during dynamic knee extensor exercise at different contraction frequencies",
abstract = "A novel approach has been developed for the quantification of total mechanical power output produced by an isolated, well-defined muscle group during dynamic exercise in humans at different contraction frequencies. The calculation of total power output comprises the external power delivered to the ergometer (i.e., the external power output setting of the ergometer) and the 'internal' power generated to overcome inertial and gravitational forces related to movement of the lower limb. Total power output was determined at contraction frequencies of 60 and 100 rpm. At 60 rpm, the internal power was 18 ± 1 W (range: 16-19 W) at external power outputs that ranged between 0 and 50 W. This was less (P < 0.05) than the internal power of 33 ± 2 W (27-38 W) at 100 rpm at 0-50 W. Moreover, at 100 rpm, internal power was lower (P < 0.05) at the higher external power outputs. Pulmonary oxygen uptake was observed to be greater (P < 0.05) at 100 than at 60 rpm at comparable total power outputs, suggesting that mechanical efficiency is lower at 100 rpm. Thus a method was developed that allowed accurate determination of the total power output during exercise generated by an isolated muscle group at different contraction frequencies.",
keywords = "Contraction velocity, Internal power, Internal work, Mechanical efficiency, Muscle moment, Quadriceps",
author = "Ferguson, {R. A.} and P. Aagaard and D. Ball and Sargeant, {A. J.} and J. Bangsbo",
year = "2000",
language = "English",
volume = "89",
pages = "1912--1918",
journal = "Journal of Applied Physiology",
issn = "8750-7587",
publisher = "American Physiological Society",
number = "5",

}

TY - JOUR

T1 - Total power output generated during dynamic knee extensor exercise at different contraction frequencies

AU - Ferguson, R. A.

AU - Aagaard, P.

AU - Ball, D.

AU - Sargeant, A. J.

AU - Bangsbo, J.

PY - 2000

Y1 - 2000

N2 - A novel approach has been developed for the quantification of total mechanical power output produced by an isolated, well-defined muscle group during dynamic exercise in humans at different contraction frequencies. The calculation of total power output comprises the external power delivered to the ergometer (i.e., the external power output setting of the ergometer) and the 'internal' power generated to overcome inertial and gravitational forces related to movement of the lower limb. Total power output was determined at contraction frequencies of 60 and 100 rpm. At 60 rpm, the internal power was 18 ± 1 W (range: 16-19 W) at external power outputs that ranged between 0 and 50 W. This was less (P < 0.05) than the internal power of 33 ± 2 W (27-38 W) at 100 rpm at 0-50 W. Moreover, at 100 rpm, internal power was lower (P < 0.05) at the higher external power outputs. Pulmonary oxygen uptake was observed to be greater (P < 0.05) at 100 than at 60 rpm at comparable total power outputs, suggesting that mechanical efficiency is lower at 100 rpm. Thus a method was developed that allowed accurate determination of the total power output during exercise generated by an isolated muscle group at different contraction frequencies.

AB - A novel approach has been developed for the quantification of total mechanical power output produced by an isolated, well-defined muscle group during dynamic exercise in humans at different contraction frequencies. The calculation of total power output comprises the external power delivered to the ergometer (i.e., the external power output setting of the ergometer) and the 'internal' power generated to overcome inertial and gravitational forces related to movement of the lower limb. Total power output was determined at contraction frequencies of 60 and 100 rpm. At 60 rpm, the internal power was 18 ± 1 W (range: 16-19 W) at external power outputs that ranged between 0 and 50 W. This was less (P < 0.05) than the internal power of 33 ± 2 W (27-38 W) at 100 rpm at 0-50 W. Moreover, at 100 rpm, internal power was lower (P < 0.05) at the higher external power outputs. Pulmonary oxygen uptake was observed to be greater (P < 0.05) at 100 than at 60 rpm at comparable total power outputs, suggesting that mechanical efficiency is lower at 100 rpm. Thus a method was developed that allowed accurate determination of the total power output during exercise generated by an isolated muscle group at different contraction frequencies.

KW - Contraction velocity

KW - Internal power

KW - Internal work

KW - Mechanical efficiency

KW - Muscle moment

KW - Quadriceps

UR - http://www.scopus.com/inward/record.url?scp=0033763126&partnerID=8YFLogxK

M3 - Article

VL - 89

SP - 1912

EP - 1918

JO - Journal of Applied Physiology

JF - Journal of Applied Physiology

SN - 8750-7587

IS - 5

ER -