The critical power concept in all-out isokinetic exercise

Jeanne Dekerle, T.J. Barstow, Luke Regan, Helen Carter

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The critical power concept has been applied to constant-load exhaustive exercise and recently validated for 3-min all-out exercise. OBJECTIVES: To test the application of critical power to a 3-min all-out isokinetic cycling exercise. DESIGN: Single-group, experimental, comparative design. METHOD: Nine participants performed a 3-min all-out isokinetic test and 4-5 constant-load exhaustive trials, at 60 and 100rpm, on an electrically-braked cycle. The linear P-t-1 relationship was modelled using a 2-parameter model (slope: critical power; intercept: Anaerobic Work Capacity). End power and accumulated work done above EP were calculated from the 3-min tests. RESULTS: No significant difference and a significant correlation was found between end power and critical power (60rpm: 259±40W vs. 245±38W, P>0.05; r=0.85, P<0.01; 100rpm: 227±57W vs. 212±44W, P>0.05; r=0.86, P<0.01). The Bias±95% limits of agreement were 14±42W at 60rpm and 15±57W at 100rpm. Work done above EP (60rpm: 14.7±3.0kJ; 100rpm: 17.3±3.1kJ) was not significantly different to the anaerobic work capacity (60rpm: 16.2±3.2kJ; 100rpm: 20.6±6.4kJ; P>0.05) but with only a significant correlation at 60rpm (r=-0.71, P<0.05). CONCLUSIONS: The 2-parameter model underpinning the critical power construct can be applied to a 3-min all-out isokinetic test. End power does not differ and correlates with critical power. However, a further insight into levels of agreement leads to some scepticism concerning the use of the two variables interchangeably. The great intra-subject differences between work done above EP and the intercept of the P-t-1 relationship should also be considered.
Original languageEnglish
Pages (from-to)640-644
Number of pages5
JournalJournal of Science and Medicine in Sport
Volume17
Issue number6
Publication statusPublished - 1 Dec 2014

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Research Design

Keywords

  • Cycling
  • Power–time relationship
  • Endurance
  • Cadence

Cite this

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title = "The critical power concept in all-out isokinetic exercise",
abstract = "The critical power concept has been applied to constant-load exhaustive exercise and recently validated for 3-min all-out exercise. OBJECTIVES: To test the application of critical power to a 3-min all-out isokinetic cycling exercise. DESIGN: Single-group, experimental, comparative design. METHOD: Nine participants performed a 3-min all-out isokinetic test and 4-5 constant-load exhaustive trials, at 60 and 100rpm, on an electrically-braked cycle. The linear P-t-1 relationship was modelled using a 2-parameter model (slope: critical power; intercept: Anaerobic Work Capacity). End power and accumulated work done above EP were calculated from the 3-min tests. RESULTS: No significant difference and a significant correlation was found between end power and critical power (60rpm: 259±40W vs. 245±38W, P>0.05; r=0.85, P<0.01; 100rpm: 227±57W vs. 212±44W, P>0.05; r=0.86, P<0.01). The Bias±95{\%} limits of agreement were 14±42W at 60rpm and 15±57W at 100rpm. Work done above EP (60rpm: 14.7±3.0kJ; 100rpm: 17.3±3.1kJ) was not significantly different to the anaerobic work capacity (60rpm: 16.2±3.2kJ; 100rpm: 20.6±6.4kJ; P>0.05) but with only a significant correlation at 60rpm (r=-0.71, P<0.05). CONCLUSIONS: The 2-parameter model underpinning the critical power construct can be applied to a 3-min all-out isokinetic test. End power does not differ and correlates with critical power. However, a further insight into levels of agreement leads to some scepticism concerning the use of the two variables interchangeably. The great intra-subject differences between work done above EP and the intercept of the P-t-1 relationship should also be considered.",
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The critical power concept in all-out isokinetic exercise. / Dekerle, Jeanne; Barstow, T.J.; Regan, Luke; Carter, Helen.

In: Journal of Science and Medicine in Sport, Vol. 17, No. 6, 01.12.2014, p. 640-644.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - The critical power concept in all-out isokinetic exercise

AU - Dekerle, Jeanne

AU - Barstow, T.J.

AU - Regan, Luke

AU - Carter, Helen

PY - 2014/12/1

Y1 - 2014/12/1

N2 - The critical power concept has been applied to constant-load exhaustive exercise and recently validated for 3-min all-out exercise. OBJECTIVES: To test the application of critical power to a 3-min all-out isokinetic cycling exercise. DESIGN: Single-group, experimental, comparative design. METHOD: Nine participants performed a 3-min all-out isokinetic test and 4-5 constant-load exhaustive trials, at 60 and 100rpm, on an electrically-braked cycle. The linear P-t-1 relationship was modelled using a 2-parameter model (slope: critical power; intercept: Anaerobic Work Capacity). End power and accumulated work done above EP were calculated from the 3-min tests. RESULTS: No significant difference and a significant correlation was found between end power and critical power (60rpm: 259±40W vs. 245±38W, P>0.05; r=0.85, P<0.01; 100rpm: 227±57W vs. 212±44W, P>0.05; r=0.86, P<0.01). The Bias±95% limits of agreement were 14±42W at 60rpm and 15±57W at 100rpm. Work done above EP (60rpm: 14.7±3.0kJ; 100rpm: 17.3±3.1kJ) was not significantly different to the anaerobic work capacity (60rpm: 16.2±3.2kJ; 100rpm: 20.6±6.4kJ; P>0.05) but with only a significant correlation at 60rpm (r=-0.71, P<0.05). CONCLUSIONS: The 2-parameter model underpinning the critical power construct can be applied to a 3-min all-out isokinetic test. End power does not differ and correlates with critical power. However, a further insight into levels of agreement leads to some scepticism concerning the use of the two variables interchangeably. The great intra-subject differences between work done above EP and the intercept of the P-t-1 relationship should also be considered.

AB - The critical power concept has been applied to constant-load exhaustive exercise and recently validated for 3-min all-out exercise. OBJECTIVES: To test the application of critical power to a 3-min all-out isokinetic cycling exercise. DESIGN: Single-group, experimental, comparative design. METHOD: Nine participants performed a 3-min all-out isokinetic test and 4-5 constant-load exhaustive trials, at 60 and 100rpm, on an electrically-braked cycle. The linear P-t-1 relationship was modelled using a 2-parameter model (slope: critical power; intercept: Anaerobic Work Capacity). End power and accumulated work done above EP were calculated from the 3-min tests. RESULTS: No significant difference and a significant correlation was found between end power and critical power (60rpm: 259±40W vs. 245±38W, P>0.05; r=0.85, P<0.01; 100rpm: 227±57W vs. 212±44W, P>0.05; r=0.86, P<0.01). The Bias±95% limits of agreement were 14±42W at 60rpm and 15±57W at 100rpm. Work done above EP (60rpm: 14.7±3.0kJ; 100rpm: 17.3±3.1kJ) was not significantly different to the anaerobic work capacity (60rpm: 16.2±3.2kJ; 100rpm: 20.6±6.4kJ; P>0.05) but with only a significant correlation at 60rpm (r=-0.71, P<0.05). CONCLUSIONS: The 2-parameter model underpinning the critical power construct can be applied to a 3-min all-out isokinetic test. End power does not differ and correlates with critical power. However, a further insight into levels of agreement leads to some scepticism concerning the use of the two variables interchangeably. The great intra-subject differences between work done above EP and the intercept of the P-t-1 relationship should also be considered.

KW - Cycling

KW - Power–time relationship

KW - Endurance

KW - Cadence

M3 - Article

VL - 17

SP - 640

EP - 644

JO - Journal of Science and Medicine in Sport

JF - Journal of Science and Medicine in Sport

SN - 1440-2440

IS - 6

ER -