title: Validity, Reliability, and Sensitivity of a Volleyball Intermittent Endurance Test.
abstract: OBJECTIVE
  To analyze the concurrent and construct validity of a volleyball intermittent endurance test (VIET). The VIET's test-retest reliability and sensitivity to assess seasonal changes was also studied.
  
  
  METHODS
  During the preseason, 71 volleyball players of different competitive levels took part in this study. All performed the VIET and a graded treadmill test with gas-exchange measurement (GXT). Thirty-one of the players performed an additional VIET to analyze the test-retest reliability. To test the VIET's sensitivity, 28 players repeated the VIET and GXT at the end of their season.
  
  
  RESULTS
  Significant (P < .001) relationships between VIET distance and maximal oxygen uptake (r = .74) and GXT maximal speed (r = .78) were observed. There were no significant differences between the VIET performance test and retest (1542.1 ± 338.1 vs 1567.1 ± 358.2 m). Significant (P < .001) relationships and intraclass correlation coefficient (ICC) were found (r = .95, ICC = .96) for VIET performance. VIET performance increased significantly (P < .001) with player performance level and was sensitive to fitness changes across the season (1458.8 ± 343.5 vs 1581.1 ± 334.0 m, P < .01).
  
  
  CONCLUSIONS
  The VIET may be considered a valid, reliable, and sensitive test to assess the aerobic endurance in volleyball players.
authors.forename: Jose A
authors.initials: JA
authors.lastname: Rodríguez-Marroyo
authors.forename: Javier
authors.initials: J
authors.lastname: Medina-Carrillo
authors.forename: Juan
authors.initials: J
authors.lastname: García-López
authors.forename: Juan C
authors.initials: JC
authors.lastname: Morante
authors.forename: José G
authors.initials: JG
authors.lastname: Villa
authors.forename: Carl
authors.initials: C
authors.lastname: Foster
mesh_terms: D000293:Adolescent; D000328:Adult; D003163:Competitive Behavior / Q000502:physiology; D005080:Exercise Test; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D010807:Physical Endurance / Q000502:physiology*; D015203:Reproducibility of Results; D012621:Seasons; D054798:Volleyball / Q000502:physiology*; D055815:Young Adult
keywords: field testing; intermittent exercise; volleyball performance