The effects of concentric fatigue on concentric, eccentric, and isometric torque

Robert W. Lewis; Terry J Housh; Haley C Bergstrom; Nathaniel D.M Jenkins; Richard J Schmidt; Joel T Cramer; Daniel A Traylor; Kristen C Cochrane; Glen O Johnson

The effects of concentric fatigue on concentric, eccentric, and isometric torque

Journal article

Peer reviewed

The effects of concentric fatigue on concentric, eccentric, and isometric torque

Robert W. Lewis, Terry J Housh, Haley C Bergstrom, Nathaniel D.M Jenkins, Richard J Schmidt, Joel T Cramer, Daniel A Traylor, Kristen C Cochrane and Glen O Johnson

Journal of exercise physiology online, Vol.16(1), pp.10-18

02/01/2013

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Abstract

Fatiguing concentric (CON) muscle actions of the leg extensors have been shown to result in differences in percent (%) decline in torque for CON, eccentric (ECC), and isometric (ISO) muscle actions. However, the effects of CON fatigue of the forearm flexors on CON, ECC, and ISO torque have not been well established. The purpose of this investigation was to determine the effects of 50 maximal CON isokinetic forearm flexion muscle actions on CON, ECC, and ISO torque. Sixteen adults (8 men (mean [+ or -] SD = 23.1 [+ or -] 2.3) and 8 women (mean [+ or -] SD age = 22.8 [+ or -] 1.4)) volunteered to perform 50 consecutive, CON forearm flexion muscle actions at 180[degrees] x [s.sup.-1]. Before and after the fatiguing workbout, peak torque was measured (randomly ordered) for CON, ECC, and ISO muscle actions. Polynomial regression analysis indicated a cubic ([R.sup.2] = 0.98) pattern of response during the 50 CON muscle actions. There were no differences in mean % decline (30%) in torque among the three types of muscle actions. The findings indicate that the CON, ECC, and ISO muscle actions share a common mechanism of fatigue as a result of the fatiguing CON workbout. Key Words: Isokinetics, Fatigue

Exercise

Fatigue

Muscle strength dynamometry

Physiological aspects

Physiological research

Research

Details

Title: Subtitle: The effects of concentric fatigue on concentric, eccentric, and isometric torque
Creators: Robert W. Lewis
Terry J Housh
Haley C Bergstrom
Nathaniel D.M Jenkins
Richard J Schmidt
Joel T Cramer
Daniel A Traylor
Kristen C Cochrane
Glen O Johnson
Resource Type: Journal article
Publication Details: Journal of exercise physiology online, Vol.16(1), pp.10-18
ISSN: 1097-9751
eISSN: 1097-9751
Publisher: American Society of Exercise Physiologists
Language: English
Date published: 02/01/2013
Description audience: Academic
Academic Unit: Center for Social Science Innovation; Injury Prevention Research Center; Health, Sport, and Human Physiology
Record Identifier: 9984259390702771

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