TITLE

Seasonal variation of haemoglobin mass in internationally competitive female road cyclists

AUTHOR(S)
Garvican, Laura A.; Martin, David T.; McDonald, Warren; Gore, Christopher J.
PUB. DATE
May 2010
SOURCE
European Journal of Applied Physiology;May2010, Vol. 109 Issue 2, p221
SOURCE TYPE
Academic Journal
DOC. TYPE
journal article
ABSTRACT
In order to quantify the seasonal variability of haemoglobin mass (Hb(mass)) in cyclists during a competitive season, and investigate whether variability is associated with changes in training load or performance, Hb(mass) was measured in 10 internationally competitive female road cyclists approximately once per month for 2-10 months via CO-rebreathing. Power meters were used to quantify daily load (Training Stress Scores) during training and racing, from which cumulative training load units for 7, 14, 28 and 42 day were calculated. Maximal mean power (MMP) for 1, 4, 10 and 25 min, performed during training or racing was used as a surrogate for performance. The relationship between changes in training load (%DeltaTraining) and changes in Hb(mass) (%DeltaHb(mass)), and between %DeltaHb(mass) and changes in MMP (%DeltaMMP) was established via regression analysis. Individual coefficients of variation (CV) in Hb(mass) ranged from 2.0 to 4.4%. The weighted mean CV in Hb(mass) was 3.3% (90% Confidence Limits: 2.9-3.8%) or 23 g over the average 6.6 +/- 2.3 month monitoring period. The effect of %DeltaTraining on %DeltaHb(mass) was small for 7 and 14 day (r = 0.22 and 0.29), moderate for 42 day (r = 0.35) and large for 28 day (r = 0.56). The regression slope was greatest for 42 day, with a 10% change in training associated with a approximately 1% change in Hb(mass). The relationship between %DeltaHb(mass) and %DeltaMMP was approximately 0.5:1 for MMP(1min),(10 min) and (25 min) and approximately 1:1 for MMP(4 min), respectively. Hb(mass) varies by approximately 3% in female cyclists during a competitive season. Some of the variation may be related to oscillations in chronic training load.
ACCESSION #
50035155

 

Related Articles

  • Multiple testing of hypotheses in comparing two groups. Cupples, L. Adrienne; Heeren, Timothy; Schatzkin, Arthur; Colton, Theodore; Cupples, L A; Heeren, T; Schatzkin, A; Colton, T // Annals of Internal Medicine;Jan84, Vol. 100 Issue 1, p122 

    Researchers frequently encounter studies that compare two groups on many variables. We discourage the use of multiple tests of hypotheses on individual variables, an approach that ignores the correlation among the variables and increases the chance of a type I error. Instead of examining each...

  • Self-Administered Tinnitus Pitch Matching versus a Conventional Audiometric Procedure. Kim, Tae Su; Yakunina, Natalia; Ryu, Yoon-Jong; Chung, Ik Joo; Nam, Eui-Cheol // Audiology & Neuro-Otology;Jul2017, Vol. 22 Issue 1, p1 

    Objective: Obtaining an accurate tinnitus pitch match is an initial and critical requirement for tinnitus evaluation and treatment, particularly for applying tailor-made notched music training. We investigated whether computer-based self-administered tinnitus pitch matching (CSTPM)...

  • Breast cancer risk and provider recommendation for mammography among recently unscreened women in the United States. Sabatino, Susan A.; Burns, Risa B.; Davis, Roger B.; Phillips, Russell S.; McCarthy, Ellen P. // JGIM: Journal of General Internal Medicine;Apr2006, Vol. 21 Issue 4, p285 

    Background and Objective: Many women with increased breast cancer risk have not been screened recently. Provider recommendation for mammography is an important reason many women undergo screening. We examined the association between breast cancer risk and reported provider...

  • Wei, Lin and Weissfeld's marginal analysis of multivariate failure time data: should it be applied to a recurrent events outcome? Metcalfe, Chris; Thompson, Simon G. // Statistical Methods in Medical Research;Apr2007, Vol. 16 Issue 2, p103 

    Wei, Lin and Weissfeld (WLW) have applied an elaboration of Cox's proportional hazards regression to the analysis of recurrent events data. This application is controversial and has attracted criticism in a piecemeal fashion over 15 years. A frequently raised concern is the method's 'risk set':...

  • Extent and determinants of discrepancy between self-evaluations of weight status and clinical standards. Chang, Virginia W.; Christakis, Nicholas A.; Chang, V W; Christakis, N A // JGIM: Journal of General Internal Medicine;Aug2001, Vol. 16 Issue 8, p538 

    Objectives: To examine the extent and type of discordance between personal and medical classifications of weight status, and to examine the influence of sociodemographic factors on the misclassification of weight status.Design/setting: The 1991 Health Promotion and...

  • Foot Pain and Pronated Foot Type Are Associated with Self-Reported Mobility Limitations in Older Adults: The Framingham Foot Study. Menz, Hylton B.; Dufour, alyssa B.; Katz, Patricia; Hannan, Marian T. // Gerontology;Apr2016, Vol. 62 Issue 3, p289 

    Background: The foot plays an important role in supporting the body when undertaking weight-bearing activities. Aging is associated with an increased prevalence of foot pain and a lowering of the arch of the foot, both of which may impair mobility.Objective: To examine...

  • Longitudinal course of disaster-related PTSD among a prospective sample of adult Chilean natural disaster survivors. Fernandez, Cristina A.; Vicente, Benjamin; Marshall, Brandon D. L.; Koenen, Karestan C.; Arheart, Kristopher L.; Kohn, Robert; Saldivia, Sandra; Buka, Stephen L.; Marshall, Brandon Dl // International Journal of Epidemiology;Apr2017, Vol. 46 Issue 2, p440 

    Background: With an increasing number of individuals surviving natural disasters, it is crucial to understand who is most at risk for developing post-traumatic stress disorder (PTSD). The objective of this study was to prospectively examine the role that pre-existing psychopathology...

  • Poor patient comprehension of abnormal mammography results. Karliner, Leah S.; Kaplan, Celia Patricia; Juarbe, Teresa; Pasick, Rena; Pérez-Stable, Eliseo J.; Patricia Kaplan, Celia; Pérez-Stable, Eliseo J // JGIM: Journal of General Internal Medicine;May2005, Vol. 20 Issue 5, p432 

    Background: Screening mammography for women 50 to 69 years of age may lead to 50% having an abnormal study. We set out to determine the proportion of women who understand their abnormal mammogram results and the factors that predict understanding.Methods: We surveyed...

  • Prenatal and neonatal risk factors for schizophrenia. Hultman, Christina M.; Ohman, Arne; Cnattingius, Sven; Wieselgren, Ing-Marie; Lindström, Leif H.; Hultman, C M; Ohman, A; Cnattingius, S; Wieselgren, I M; Lindström, L H // British Journal of Psychiatry;Feb97, Vol. 170, p128 

    Background: The present study examines the effects of independent, single pre- and perinatal risk factors and rates of obstetric complications upon the subsequent development of schizophrenia.Method: This study was based on prospectively recorded birth records of 107...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics