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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS


The Journal of Sports Medicine and Physical Fitness 2003 September;43(3):274-8

Copyright © 2009 EDIZIONI MINERVA MEDICA

language: English

Kinematic changes at intensities proximal to onset of lactate accumulation

Shim J., Acevedo E. O., Kraemer R. R., Haltom R. W., Tryniecki J. L.

Department of Health Human Performance, and Recreation, Waco, Texas Baylor University, Waco, TX, USA


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Aim. The pur­pose of ­this ­study was to ­examine ­changes in ­selected kin­e­matic var­i­ables at 3 run­ning inten­sities prox­imal to the ­onset of ­blood lac­tate accu­mu­la­tion (­OBLA; 4 mM of ­blood lac­tate). It was hypoth­e­sized ­that ­greater ­changes in ­lower ­body ­mechanics ­would ­occur ­when run­ning ­faster ­than ­normal ­race ­pace com­pared to ­when run­ning ­slower ­than ­race ­pace.
­Methods. ­Nine com­pet­i­tive ­male dis­tance run­ners ran at ­3 run­ning inten­sities (RI): 1) ­each ­runner’s V.O2 at 10% ­below the V.O2 at ­OBLA, 2) V.O2 at ­OBLA, and 3) V.O2 at 10% ­above the V.O2 at ­OBLA. ­Selected kin­e­matic and phys­io­log­ical var­i­ables ­were meas­ured at ­each RI.
­Results. V.O2 at RI 1, 2 and 3 was ­highly cor­re­lated ­with run­ning ­speed (r=0.93). The ­blood lac­tate (BL) ­showed a non­linear ­increase ­from RI 1 (2.9±0.8 mM) to 2 (4.1±0.9 mM) to 3 (6.7±1.8 mM). The ver­tical oscil­la­tion of ­center of ­gravity (­VOCOG), ­stride fre­quency (SF), ­range of ­motion (ROM) of ­trunk ­angle, and max­imal ­knee ­flexion ­during ­flight ­phase (­MKFF) ­changed non­lin­e­arly as did the BL. Sig­nif­i­cant rela­tion­ships ­between BL and ­VOCOG (r=0.44) and ­between BL and SF (r=0.51) ­were ­found (ps<0.05).
Con­clu­sion. The find­ings ­show a pos­sibility ­that ­lower ­body run­ning ­mechanics ­have a rela­tion­ship ­with BL.

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