Document Detail

Knee isokinetic strength and body fat analysis in university students.
MedLine Citation:
PMID:  11272798     Owner:  NLM     Status:  MEDLINE    
Many factors such as anthropometric variables influence strength performance. This study is to determine the relationship between knee isokinetic strength and body composition, and to compare the gender differences. Test-retest reliability had been performed within one week for all measurement methods before the formal study. Fifty-eight 20-25 year-old university students, 32 females and 26 males, participated in this study. Isokinetic strength of the knee flexion and extension was measured at two angular velocities of 60 degrees/sec and 120 degrees/sec. Body composition was measured by bioelectrical impedance analysis (BIA) and skinfold caliper. The others variables including height, body weight, body mass index (BMI), and waist to hip ratio were measured or calculated. The results showed that the intra-class correlation coefficients for isokinetic knee strength were between 0.83 and 0.93, and body composition and anthropometric variables were between 0.83 and 0.98. Isokinetic knee strength was significantly correlated with body height, body weight, BMI, waist and hip ratio and percent of body fat estimated by skinfold caliper (r = -0.56 to 0.64). The correlation between isokinetic strength with percent of body fat estimated by BIA (r = -0.60 to -0.74; p < 0.001) and with fat free mass (r = 0.64 to 0.78; p < 0.001) was even higher. Although male subjects had significantly greater mean values in body height, body weight, waist to hip ratio and isokinetic strength than female subjects, the MANCOVA showed that the effect of gender on knee isokinetic strength would be eliminated when the covariant variable, the percent of body fat measured by BIA and BMI was controlled in the analysis model. In conclusion, knee isokinetic strength was significantly negatively correlated with proportion of fat and positively correlated with fat free mass. The magnitude of strength difference between males and females could be explained by differences in body fat proportion and BMI in this study. Therapist would take the body fat composition, fat free mass, and BMI into consideration in knee muscle strength measurement. Less body fat and higher BMI will contain more fat free mass that produces more muscle strength.
Y J Lue; J J Chang; H M Chen; R F Lin; S S Chen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Kaohsiung journal of medical sciences     Volume:  16     ISSN:  1607-551X     ISO Abbreviation:  Kaohsiung J. Med. Sci.     Publication Date:  2000 Oct 
Date Detail:
Created Date:  2001-03-01     Completed Date:  2001-03-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100960562     Medline TA:  Kaohsiung J Med Sci     Country:  China (Republic: 1949- )    
Other Details:
Languages:  eng     Pagination:  517-24     Citation Subset:  IM    
School of Rehabilitation Medicine, Kaohsiung Medical University, Taiwan.
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MeSH Terms
Adipose Tissue / anatomy & histology*
Body Composition*
Body Mass Index
Body Weight
Electric Impedance
Knee Joint / physiology*
Skinfold Thickness

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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