Year-to-year variability in haemoglobin mass response to two altitude training camps.

Content Provider	Europe PMC
Author	McLean, Blake D Buttifant, David Gore, Christopher J White, Kevin Kemp, Justin
Copyright Year	2013
Abstract	AimTo quantify the year-to-year variability of altitude-induced changes in haemoglobin mass (Hbmass) in elite team-sport athletes.Methods12 Australian-Footballers completed a 19-day (ALT1) and 18-day (ALT2) moderate altitude (∼2100 m), training camp separated by 12 months. An additional 20 participants completed only one of the two training camps (ALT1 additional n=9, ALT2 additional n=11). Total Hbmass was assessed using carbon monoxide rebreathing before (PRE), after (POST1) and 4 weeks after each camp. The typical error of Hbmass for the pooled data of all 32 participants was 2.6%. A contemporary statistics analysis was used with the smallest worthwhile change set to 2% for Hbmass.ResultsPOST1 Hbmass was very likely increased in ALT1 (3.6±1.6%, n=19; mean±∼90 CL) as well as ALT2 (4.4±1.3%, n=23) with an individual responsiveness of 1.3% and 2.2%, respectively. There was a small correlation between ALT1 and ALT2 (R=0.21, p=0.59) for a change in Hbmass, but a moderately inverse relationship between the change in Hbmass and initial relative Hbmass (g/kg (R=−0.51, p=0.04)).ConclusionsTwo preseason moderate altitude camps 1 year apart yielded a similar (4%) mean increase in Hbmass of elite footballers, with an individual responsiveness of approximately half the group mean effect, indicating that most players gained benefit. Nevertheless, the same individuals generally did not change their Hbmass consistently from year to year. Thus, a ‘responder’ or ‘non-responder’ to altitude for Hbmass does not appear to be a fixed trait.
Related Links	https://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC3903153&blobtype=pdf
ISSN	03063674
Journal	British Journal of Sports Medicine [Br J Sports Med]
Volume Number	47 Suppl 1
DOI	10.1136/bjsports-2013-092744
PubMed Central reference number	PMC3903153
Issue Number	Suppl 1
PubMed reference number	24282208
e-ISSN	14730480
Language	English
Publisher	BMJ Publishing Group
Publisher Date	2013-12-01
Publisher Place	BMA House, Tavistock Square, London, WC1H 9JR
Access Restriction	Open
Rights License	This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 3.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/3.0/ Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions
Subject Keyword	Physiology Exercise Altitude Elite performance
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science