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A Journal on Applied Physiology, Biomechanics, Preventive Medicine,
Sports Medicine and Traumatology, Sports Psychology


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The Journal of Sports Medicine and Physical Fitness 2003 September;43(3):267-73

EXERCISE PHYSIOLOGY AND BIOMECHANICS 

 Original articles

Percentual responses proximal to the onset of blood lactate accumulation

Acevedo E. O. 1, Kraemer R. R. 2, Haltom R. W. 3, Tryniecki J. L. 2

1 Depart­ment of Exer­cise Sci­ence and Lei­sure Man­age­ment, Uni­ver­sity of Mis­sis­sipi, MS, USA
2 Depart­ment of Kin­e­sio­logy and ­Health ­Studies, South­eastern Loui­siana Uni­ver­sity, Ham­mond, LA, USA
3 Depart­ment of ­Health Pro­mo­tion, Branch Med­ical ­Clinic, May­port, FL, USA

Aim. Run­ning at incre­mental veloc­ities prox­imal to the ­onset of ­blood lac­tate accu­mu­la­tion (­OBLA) ­elicits ­linear ­increases in V.O2, and HR, ­while the ­increases in V.E and ­blood ­lactic ­acid con­cen­tra­tions (BLa) are cur­vi­linear. In addi­tion, ­effort ­sense is ­often meas­ured in the ­field ­with the tra­di­tional 15-­point ­scale Rat­ings of Per­ceived Exer­tion ­scale, ­increases lin­e­arly ­whereas the per­cep­tual ­response of ­affect ­seem to ­decrease in a non­linear ­manner. ­This ­study exam­ined the ­changes in ­effort ­sense (RPE) and ­affect, uti­lizing the ­Feeling ­Scale (FS), at 3 run­ning inten­sities prox­imal to the ­onset of ­blood lac­tate accu­mu­la­tion. In addi­tion, the rela­tion­ship ­between ­these per­cep­tual ­responses and V.E, V.O2, HR, RER, and BLa ­were exam­ined.
­Methods. ­Eleven ­highly-­trained dis­tance run­ners (V.O2max = 67.65±1.24) par­tic­i­pated in 2 ses­sions of ­data col­lec­tion. ­During Ses­sion 1 sub­jects per­formed a dis­con­tin­uous pro­gres­sive tread­mill pro­tocol to deter­mine ­peak ­aerobic ­power. ­After ­each ­stage a ­finger tip ­blood ­sample was ­taken to deter­mine BLa. A regres­sion ­line ­between the 2 suc­ces­sive work­loads ­that pro­duced BLa ­above and ­below 4 mM was cal­cu­lated to pre­dict the V.O2 ­that ­would gen­erate 4mM BLa (V.O2 @ 4 mM). ­Within 1 ­week ­each sub­ject ­returned for Ses­sion 2, ­which ­included a 10-min ­warm-up run fol­lowed by 3 sub­max­imal ­runs ­lasting 5 min ­each: the V.O2 at 10% ­below ­OBLA (V.O2 10% ↓), the V.O2 at ­OBLA (V.O2 @ 4 mM), and the V.O2 at 10% ­above ­OBLA (V.O2 10%–). ­During the ­last ­minute of ­each run V.O2, V.E, HR, RER, RPE, and FS ­were ­assessed. In addi­tion, Bla was ­assessed imme­di­ately fol­lowing ­each run.
­Results. ­Results dem­on­strated ­that V.O2 10% ↓, V.O2 @ 4 mM, and V.O2 10% ↑ elic­ited BLa of 2.66±0.33, 3.75±0.40, and 6.10±0.68 mM, respec­tively. In addi­tion, RPE ­increased sig­nif­i­cantly ­from V.O2 10% ↓ to V.O2 @ 4 mM and ­from V.O2 @ 4 mM to V.O2 10% ↑; ­whereas FS dem­on­strated a ­slight ­decrease ­from V.O2 10% ↓ to V.O2 @ 4 mM, and a ­more sub­stan­tial and sig­nif­i­cant ­decrease ­from V.O2 @ 4 mM to V.O2 10% ↑. Cor­re­la­tional anal­yses ­revealed sig­nif­i­cant rela­tion­ships at V.O2 10% ↑. Spe­cif­i­cally, RPE and FS ­were neg­a­tively ­related (r=0.62), ­while RPE and V.O2 ­were pos­i­tively ­related (r=0.53). Cor­re­la­tions ­across all work­loads ­revealed a ten­dency for ­more pow­erful rela­tion­ships to ­exist ­among RPE and phys­io­log­ical ­cues ­than FS and phys­io­log­ical ­cues.
Con­clu­sion. ­This is the ­first ­study to ­directly ­examine ­changes in RPE and FS in rela­tion to the phys­io­log­ical ­threshold for anaer­obic metab­olism, Bla, ­which ­responds to ­linear ­increases in exer­cise inten­sity in a cur­vi­linear ­manner. ­Results sup­port pre­vious inves­ti­ga­tions sug­gesting a ­that the ­drop in FS has ­some dis­tinc­tion ­from the ­increase in RPE and ­that FS may be ­more sen­si­tive to the ­onset of anaer­obic metab­olism. More­over, the rela­tion­ship of RPE to FS at V.O2 10% ↑, but not V.O2 10% ↓ and V.O2 @ 4 mM, sup­ports the hypoth­esis ­that the ­unique var­i­ability of FS is dimin­ished at ­higher inten­sities of exer­cise ­when phys­io­log­ical ­cues are unam­big­uous.

language: English


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