Document Detail

Correlations between Internal and External Power Outputs during Weightlifting Exercise.
MedLine Citation:
PMID:  22739324     Owner:  NLM     Status:  Publisher    
ABSTRACT: Identifying loads that maximize mechanical power is important because training at such loads may optimize gains in dynamic athletic performance. The purpose of this study was to examine correlations between measures of external mechanical power output and internal mechanical joint power output across different loads during a weightlifting exercise. Ten subjects performed three sets of the clean exercise at 65, 75, and 85% of 1-RM. Peak external mechanical power output was calculated with four commonly used methods, whereas an inverse dynamics approach was used to calculate peak internal mechanical power output for the hip, knee, and ankle joints along with the peak of the sum of all internal joint powers. All peak mechanical power outputs were expressed as relative peak power by either ratio (W/kg) or allometrically scaling to body-mass (W/kg). Correlation coefficients were used to compare power output measures. The greatest numbers of significant correlations between internal and external power outputs were observed at 85% of 1-RM, at this load hip and knee joint power outputs where correlated to external mechanical power output when calculated with the traditional work-energy method. In addition, the peak sum of all mechanical joint powers was correlated to mechanical power output when calculated with the impulse-momentum method at loads of 75% and 85% of 1-RM. Allometric scaling of power outputs yielded one more significant correlations than ratio scaled power outputs. These findings support the use of the work-energy method when making inferences about internal joint powers from external power outputs when loads equal to 85% of 1-RM are being lifted. In addition, the impulse-momentum method may be used to make inferences about the sum of all internal joint powers from external power outputs when loads between 75% and 85% of 1-RM are being lifted.
Kristof Kipp; Chad Harris; Michelle Sabick
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-26
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  -     ISSN:  1533-4287     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1Department of Physical Therapy, Marquette University, Milwaukee, WI 2Department of Allied Health, Western New Mexico University, Silver City, NM 3Department of Mechanical and Biomedical Engineering, Boise State University, Boise, ID.
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