european college of sport science

Saturday, June 27th, 2009
THE RELATIONSHIP BETWEEN AGE, GENDER, BODY COMPOSITION AND CARDIO RESPIRATORY FITNESS IN STUDENTS
AGED 8 – 11 YEARS BY USE OF FFMI – FMI REGRESSION MODEL
DELFAN, M., AGHA ALINEJAD, H., MIRZAEI RABAR, M., LOTFI, SH.
SHAHID BEHESHTI UNIVERSITY
Introduction: Age, gender, body composition and genetic affect on cardio respiratory fitness. Variability of physiological responses to
exercise in children cause to different interpretation of the effective parameters (Welsman & Armstrong 1996).The aim of the present study
was to investigate the association between cardio respiratory fitness and age, gender, body composition as solid, average or slender in
students aged 8–11 years.
Methods: This cross sectional study was performed on 685 students (347 boys and 338 girls). Subjects were selected via a multi – level
cluster sampling. After adjustment for differences in age, gender and body mass by FFMI – FMI regression model that Fat free mass
index(FFMI)(dividing fat free mass to squared stature ) predicted by fat mass index(FMI)( dividing fat mass to squared stature ) stratified 3
group; Normal , Solid (higher amount of FFM than normal group ) and Slender (lower amount of FFM than normal group )( Van Etten et al
1994). 20 m Shuttle run test used for estimation of maximal oxygen uptake (VO2peak) as an indices of cardio respiratory fitness that was
expressed in absolute values.
Results: Our study showed solid group had upper values [(Boys: 8yrs =1/42; 9yrs =1/65; 10yrs =1/57; 11yrs =1/80 l/min)(Girls: 8yrs =1/27;
9yrs =1/54; 10yrs =1/44; 11yrs =1/51 l/min)] and slender group had lower values [Boys: 8yrs=0/98; 9yrs =1/05; 10yrs =1/26; 11yrs =1/23
l/min)(Girls: 8yrs =1/02; 9yrs =1/15; 10yrs=1/15; 11yrs =1/16 l/min)] in VO2peak even after controlling for age, gender and body
mass(P