Comparison of interpolation and central activation ratios as measures of muscle inactivation

Behm, David, Power, Kevin and Drinkwater, Eric 2001, Comparison of interpolation and central activation ratios as measures of muscle inactivation, Muscle & nerve, vol. 24, no. 7, pp. 925-934, doi: 10.1002/mus.1090.abs.

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Title Comparison of interpolation and central activation ratios as measures of muscle inactivation
Author(s) Behm, David
Power, Kevin
Drinkwater, EricORCID iD for Drinkwater, Eric
Journal name Muscle & nerve
Volume number 24
Issue number 7
Start page 925
End page 934
Total pages 10
Publisher John Wiley & Sons
Place of publication London, Eng.
Publication date 2001-07
ISSN 0148-639X
Keyword(s) central activation failure
interpolated-twitch technique
muscle inactivation
Summary The objective of this study was to investigate different methods of estimating muscle inactivation, derived from single and multiple voluntary contractions. Ten subjects performed maximal and submaximal leg extensor contractions to determine an interpolation (IT) or central activation ratio (CAR). A superimposed evoked force was compared with the force output of either a voluntary (CAR) or resting evoked contraction (IT ratio), or the ratios were inserted into regression equations (linear, polynomial, exponential). Linear-regression estimates of CAR using doublets and tetanus provided physiologically inaccurate values. Whereas IT ratios using doublets (IT-doublet) and tetanus (IT-tetanus) had a significant difference in only one interaction, IT-tetanus and CAR using a tetanus (CAR-tetanus) estimates provided the most extensive correlation within and between measures. Thus, tetanic stimulation superimposed upon single maximal or multiple contractions seems to provide the most valid measure of muscle inactivation when using the interpolated-twitch technique.
Language eng
DOI 10.1002/mus.1090.abs
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
Socio Economic Objective 929999 Health not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2001, John Wiley & Sons
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Document type: Journal Article
Collections: Faculty of Health
School of Exercise and Nutrition Sciences
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