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The Journal of Sports Medicine and Physical Fitness 1998 September;38(3):188-93

Copyright © 1999 EDIZIONI MINERVA MEDICA

lingua: Inglese

Monitoring intensive endurance training at moderate energetic demands using resting laboratory markers failed to recognize an early overtraining stage

Gastmann U. 1, Petersen K. G. 2, Bocker J. 3, Lehmann M. 1

1 Department of Sports Medicine, University Medical Clinic, Ulm; 2 Department of Endocrinology, University Clinic Freiburg, Freiburg, Germany; 3 Department of Clinical Biochemistry, University Clinic Freiburg, Freiburg, Germany


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Back­ground. Aim was to ­answer the ques­tion ­whether ­resting labor­a­tory param­e­ters are suit­able for mon­i­toring inten­sive endu­rance ­training at mod­erate ener­getic ­demands. ­This was ­designed ­since ­markers of over­training at ­high ener­getic ­demands, ­e.g. mild ­anemia, leu­ko­penia, ­iron defi­ciency, ­reduced ­serum ­albumin, glu­cose, tri­gly­ce­ride, tri­gly­ce­ride-­rich cho­les­terol (LDL, ­VLDL), ­free ­fatty ­acid, ­increased ­plasma nor­a­dren­a­line ­levels, and ­decreased ­basal cat­e­chol­a­mine excre­tions ­were rec­om­mended.
­Methods. A pros­pec­tive 6-wk, 6-dys/wk inten­sive ­steady ­state and ­interval ­cycle ergom­eter ­training of 40-60 min/dy was per­formed. ­Total ­load was ­about 6-­time pre­training activ­ities fol­lowed by a 2-wk, 2-hour/wk regen­er­a­tive ­training ­period. Six rec­re­a­tional ath­letes (VO2max 51.5±4.5 ml·kg-1·min-1) par­tic­i­pated and fin­ished the ­study. A ­large pat­tern of ­resting hemat­o­log­ical, ­blood-chem­ical, and hor­monal param­e­ters was ­tested ­regarding suit­ability for mon­i­toring ­over­training.
­Results. ­After 3 wks, sub­max­imum and max­imum per­for­mance ­were sig­nif­i­cantly ­increased, ­stopped ­improving ­between wk 3 and 6, or dete­ri­orated. No super­com­pen­sa­tion ­occurred ­after regen­er­a­tion, but a ­decrease in ­work ­output. ­Lack of pro­gres­sion and super­com­pen­sa­tion, and ­decreased max­imum ­work ­output indi­cate a crit­ical ­stage in the ­training pro­cess.
Con­clu­sions. All exam­ined ­resting labor­a­tory param­e­ters ­failed to ­reflect ­this crit­ical ­stage ­except for a sig­nif­i­cant ­decrease in ­serum glu­cose, fer­ritin, and ­free ­fatty ­acid con­cen­tra­tions.

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