Contributions of Lower-Body Strength Parameters to Critical Power and Anaerobic Work Capacity

M. Travis Byrd, Brian J. Wallace, Jody L. Clasey, Haley C. Bergstrom

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


This study examined the contribution of lower-body strength and isokinetic peak torque measures to the prediction of critical power (CP) and anaerobic work capacity (AWC). Fourteen recreationally trained males (mean ± SD age: 22.4 ± 2.5 years; height: 177.9 ± 7.7 cm; body mass: 84.2 ± 12.4 kg) with anaerobic training experience participated in this study. The lower-body strength measures included 1 repetition max bilateral back squat (BSq), isokinetic peak torque at 30°·s-1[PT30], and isokinetic peak torque at 240°·s-1[PT240] of the dominant leg. The CP and AWC were determined from the 3-minute all-out CP cycle ergometer test (CP3MT), with the resistance set at 4.5% of the total body mass. The CP was defined as the mean power output over the final 30 seconds of the test, and the AWC was calculated using the equation, AWC = 150 seconds (P150- CP), where P150equals the mean power output for the first 150 seconds. Stepwise regression analyses indicated that only BSq contributed significantly to the prediction of AWC (AWC = 0.0527 [BSq] + 8.094 [standard error of estimate = 2.151 kJ; p = 0.012]), with a correlation of r2= 0.423. None of the strength parameters significantly predicted CP. These findings indicated that BSq strength accounted for 42% of the variance in AWC, but lower-body strength was not related to CP. The current results indirectly support the unique metabolic characteristics of both CP and AWC in providing separate measures of an individual's aerobic and anaerobic capabilities, respectively.

Original languageEnglish
Pages (from-to)97-101
Number of pages5
JournalJournal of Strength and Conditioning Research
Issue number1
StatePublished - Jan 1 2021

Bibliographical note

Publisher Copyright:
© 2021 NSCA National Strength and Conditioning Association. All rights reserved.


  • cycle performance
  • exercise metabolism
  • isokinetic

ASJC Scopus subject areas

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


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