Blood volumes following preseason heat versus altitude: A case study of australian footballers

McLean, BD; White, K; Gore, CJ; Kemp, J

Blood volumes following preseason heat versus altitude: A case study of australian footballers

McLean, BD White, K Gore, CJ Kemp, J

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Publisher:: Human Kinetics
Publication Type:: Journal Article
Citation:: International Journal of Sports Physiology and Performance, 2020, 15, (4), pp. 590-594
Issue Date:: 2020-01-01

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Field	Value	Language
dc.contributor.author	McLean, BD
dc.contributor.author	White, K
dc.contributor.author	Gore, CJ
dc.contributor.author	Kemp, J
dc.date.accessioned	2020-07-30T05:17:33Z
dc.date.available	2020-07-30T05:17:33Z
dc.date.issued	2020-01-01
dc.identifier.citation	International Journal of Sports Physiology and Performance, 2020, 15, (4), pp. 590-594
dc.identifier.issn	1555-0265
dc.identifier.issn	1555-0273
dc.identifier.uri	http://hdl.handle.net/10453/141932
dc.description.abstract	© 2020 Human Kinetics, Inc. Purpose: There is debate as to which environmental intervention produces the most benefit for team sport athletes, particularly comparing heat and altitude. This quasi-experimental study aimed to compare blood volume (BV) responses with heat and altitude training camps in Australian footballers. Methods: The BV of 7 professional Australian footballers (91.8 [10.5] kg, 191.8 [10.1] cm) was measured throughout 3 consecutive spring/summer preseasons. During each preseason, players participated in altitude (year 1 and year 2) and heat (year 3) environmental training camps. Year 1 and year 2 altitude camps were in November/ December in the United States, whereas the year 3 heat camp was in February/March in Australia after a full exposure to summer heat. BV, red cell volume, and plasma volume (PV) were measured at least 3 times during each preseason. Results: Red cell volume increased substantially following altitude in both year 1 (d = 0.67) and year 2 (d = 1.03), before returning to baseline 4 weeks postaltitude. Immediately following altitude, concurrent decreases in PV were observed during year 1 (d = -0.40) and year 2 (d = -0.98). With spring/summer training in year 3, BV and PV were substantially higher in January than temporally matched postaltitude measurements during year 1 (BV: d = -0.93, PV: d = -1.07) and year 2 (BV: d = -1.99, PV: d = -2.25), with year 3 total BV, red cell volume, and PV not changing further despite the 6-day heat intervention. Conclusions: We found greater BV after training throughout spring/summer conditions, compared with interrupting spring/summer exposure to train at altitude in the cold, with no additional benefits observed from a heat camp following spring/summer training.
dc.language	en
dc.publisher	Human Kinetics
dc.relation.ispartof	International Journal of Sports Physiology and Performance
dc.relation.isbasedon	10.1123/ijspp.2019-0350
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	1106 Human Movement and Sports Sciences, 1116 Medical Physiology, 1701 Psychology
dc.subject.classification	Sport Sciences
dc.title	Blood volumes following preseason heat versus altitude: A case study of australian footballers
dc.type	Journal Article
utslib.citation.volume	15
utslib.for	1106 Human Movement and Sports Sciences
utslib.for	1116 Medical Physiology
utslib.for	1701 Psychology
pubs.organisational-group	/University of Technology Sydney/Faculty of Health
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	open_access	*
pubs.consider-herdc	false
dc.date.updated	2020-07-30T05:17:29Z
pubs.issue	4
pubs.publication-status	Published
pubs.volume	15
utslib.citation.issue	4

Abstract:

© 2020 Human Kinetics, Inc. Purpose: There is debate as to which environmental intervention produces the most benefit for team sport athletes, particularly comparing heat and altitude. This quasi-experimental study aimed to compare blood volume (BV) responses with heat and altitude training camps in Australian footballers. Methods: The BV of 7 professional Australian footballers (91.8 [10.5] kg, 191.8 [10.1] cm) was measured throughout 3 consecutive spring/summer preseasons. During each preseason, players participated in altitude (year 1 and year 2) and heat (year 3) environmental training camps. Year 1 and year 2 altitude camps were in November/ December in the United States, whereas the year 3 heat camp was in February/March in Australia after a full exposure to summer heat. BV, red cell volume, and plasma volume (PV) were measured at least 3 times during each preseason. Results: Red cell volume increased substantially following altitude in both year 1 (d = 0.67) and year 2 (d = 1.03), before returning to baseline 4 weeks postaltitude. Immediately following altitude, concurrent decreases in PV were observed during year 1 (d = -0.40) and year 2 (d = -0.98). With spring/summer training in year 3, BV and PV were substantially higher in January than temporally matched postaltitude measurements during year 1 (BV: d = -0.93, PV: d = -1.07) and year 2 (BV: d = -1.99, PV: d = -2.25), with year 3 total BV, red cell volume, and PV not changing further despite the 6-day heat intervention. Conclusions: We found greater BV after training throughout spring/summer conditions, compared with interrupting spring/summer exposure to train at altitude in the cold, with no additional benefits observed from a heat camp following spring/summer training.

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http://hdl.handle.net/10453/141932