title: Reliability of vertical jump performance evaluated with contact mat in elderly women.
abstract: The aim of this study was to evaluate the reliability of the vertical jump (VJ) using a contact mat in elderly women. Thirty-one physically active women aged 69·5 ± 5·6 years participated in this study. Jump performance was evaluated with a contact mat. The first testing session (s1) consisted of four countermovement jumps interspersed with 40 s rest intervals. After a period of 5-7 days, volunteers performed the second session (s2) utilizing the same procedures. The intersession statistical analysis was calculated considering the two highest jumps, one obtained in each section. The intra-session analysis utilized all eight jumps, all four from each section, and the differences between means were calculated by repeated measures ANOVA. Reliability was tested using the intra-class correlation coefficient (ICC) and agreement by the Bland-Altman method. The intra- and inter-subject variation percentage was calculated by the coefficient of variation (CV).
  
  
  RESULTS
  The intersession results displayed a high ICC (0·91; P<0·001) and a good agreement verified by the Bland-Altman method. There was a significant difference in the intra-session analysis only in s2 between the jumps 2 and 4. Both in s1 and s2, the ICC was high (0·96; P<0·001; 0·95; P<0·001), and the within session reliability CV was low (10·14% and 9·07%).
  
  
  CONCLUSIONS
  In physically active elderly women, VJ evaluation using a contact mat is a reliable method and could be used to estimate jump height. Additionally, the results of this study could serve as reference values in similar samples evaluated with the same procedures.
authors.affiliation: Graduation Program Graduation Program on Physical Education, Catholic University of Brasilia, Brasilia, Brazil. fariasdl@gmail.com
authors.forename: Darlan L
authors.initials: DL
authors.lastname: Farias
authors.forename: Tatiane G
authors.initials: TG
authors.lastname: Teixeira
authors.forename: Bibiano
authors.initials: B
authors.lastname: Madrid
authors.forename: Danilo
authors.initials: D
authors.lastname: Pinho
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Boullosa
authors.forename: Jonato
authors.initials: J
authors.lastname: Prestes
mesh_terms: D000367:Age Factors; D000368:Aged; D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D005260:Female; D015577:Geriatric Assessment / Q000379:methods*; D006801:Humans; D008875:Middle Aged; D009119:Muscle Contraction; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000502:physiology*; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D012737:Sex Factors; D013997:Time Factors