PMID- 26641647 OWN - NLM STAT- MEDLINE DCOM- 20160628 LR - 20181113 IS - 1932-6203 (Electronic) IS - 1932-6203 (Linking) VI - 10 IP - 12 DP - 2015 TI - Association of Hematological Variables with Team-Sport Specific Fitness Performance. PG - e0144446 LID - 10.1371/journal.pone.0144446 [doi] LID - e0144446 AB - PURPOSE: We investigated association of hematological variables with specific fitness performance in elite team-sport players. METHODS: Hemoglobin mass (Hbmass) was measured in 25 elite field hockey players using the optimized (2 min) CO-rebreathing method. Hemoglobin concentration ([Hb]), hematocrit and mean corpuscular hemoglobin concentration (MCHC) were analyzed in venous blood. Fitness performance evaluation included a repeated-sprint ability (RSA) test (8 x 20 m sprints, 20 s of rest) and the Yo-Yo intermittent recovery level 2 (YYIR2). RESULTS: Hbmass was largely correlated (r = 0.62, P<0.01) with YYIR2 total distance covered (YYIR2TD) but not with any RSA-derived parameters (r ranging from -0.06 to -0.32; all P>0.05). [Hb] and MCHC displayed moderate correlations with both YYIR2TD (r = 0.44 and 0.41; both P<0.01) and RSA sprint decrement score (r = -0.41 and -0.44; both P<0.05). YYIR2TD correlated with RSA best and total sprint times (r = -0.46, P<0.05 and -0.60, P<0.01; respectively), but not with RSA sprint decrement score (r = -0.19, P>0.05). CONCLUSION: Hbmass is positively correlated with specific aerobic fitness, but not with RSA, in elite team-sport players. Additionally, the negative relationships between YYIR2 and RSA tests performance imply that different hematological mechanisms may be at play. Overall, these results indicate that these two fitness tests should not be used interchangeably as they reflect different hematological mechanisms. FAU - Brocherie, Franck AU - Brocherie F AD - ISSUL, Institute of Sports Sciences, University of Lausanne, Lausanne, Switzerland. AD - Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland. FAU - Millet, Gregoire P AU - Millet GP AD - ISSUL, Institute of Sports Sciences, University of Lausanne, Lausanne, Switzerland. AD - Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland. FAU - Hauser, Anna AU - Hauser A AD - ISSUL, Institute of Sports Sciences, University of Lausanne, Lausanne, Switzerland. AD - Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland. AD - Swiss Federal Institute of Sport, Section for Elite Sport, Magglingen, Switzerland. FAU - Steiner, Thomas AU - Steiner T AD - Swiss Federal Institute of Sport, Section for Elite Sport, Magglingen, Switzerland. FAU - Wehrlin, Jon P AU - Wehrlin JP AD - Swiss Federal Institute of Sport, Section for Elite Sport, Magglingen, Switzerland. FAU - Rysman, Julien AU - Rysman J AD - Faculty of Motor Sciences, Universite Libre de Bruxelles, Brussels, Belgium. FAU - Girard, Olivier AU - Girard O AD - ISSUL, Institute of Sports Sciences, University of Lausanne, Lausanne, Switzerland. AD - Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland. AD - ASPETAR, Orthopaedic and Sports Medicine Hospital, Athlete Health and Performance Research Centre, Doha, Qatar. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20151207 PL - United States TA - PLoS One JT - PloS one JID - 101285081 RN - 0 (Hemoglobins) SB - IM MH - Adult MH - Athletic Performance/*physiology MH - Exercise Test MH - Hemoglobins/*analysis MH - Hockey/*physiology MH - Humans MH - Male MH - Physical Endurance/*physiology PMC - PMC4671600 COIS- Competing Interests: The authors have declared that no competing interests exist. EDAT- 2015/12/08 06:00 MHDA- 2016/06/29 06:00 PMCR- 2015/12/07 CRDT- 2015/12/08 06:00 PHST- 2015/08/07 00:00 [received] PHST- 2015/11/18 00:00 [accepted] PHST- 2015/12/08 06:00 [entrez] PHST- 2015/12/08 06:00 [pubmed] PHST- 2016/06/29 06:00 [medline] PHST- 2015/12/07 00:00 [pmc-release] AID - PONE-D-15-34753 [pii] AID - 10.1371/journal.pone.0144446 [doi] PST - epublish SO - PLoS One. 2015 Dec 7;10(12):e0144446. doi: 10.1371/journal.pone.0144446. eCollection 2015.