NDLI: Oxygen uptake and blood metabolic responses to a 400-m run

Content Provider	Springer Nature Link
Author	Han, Christine Lepretre, Pierre Marie Bishop, David Thomas, Claire
Copyright Year	2010
Abstract	This study aimed to investigate the oxygen uptake and metabolic responses during a 400-m run reproducing the pacing strategy used in competition. A portable gas analyser was used to measure the oxygen uptake $$ \left( {\dot{V}{{{\text{O}}_{ 2} }} } \right) $$ of ten specifically trained runners racing on an outdoor track. The tests included (1) an incremental test to determine maximal $$ \dot{V}{{{\text{O}}_{ 2} }} \,\left( {\dot{V}{{{\text{O}}_{{ 2 {\text{max}}}} }} } \right) $$ and the velocity associated with $$ \dot{V}{{{\text{O}}_{{ 2 {\text{max}}}} }} \left( {{\text{v}}-\dot{V}{{{\text{O}}_{{ 2 {\text{max}}}} }} } \right), $$ (2) a maximal 400-m (400T) and 3) a 300-m running test (300T) reproducing the exact pacing pattern of the 400T. Blood lactate, bicarbonate concentrations $$ \left[ {{\text{HCO}}_{ 3}^{ - } } \right], $$ pH and arterial oxygen saturation were analysed at rest and 1, 4, 7, 10 min after the end of the 400 and 300T. The peak $$ \dot{V}{{{\text{O}}_{ 2} }} $$ recorded during the 400T corresponded to 93.9 ± 3.9% of $$ \dot{V}{{{\text{O}}_{2\max } }} $$ and was reached at 24.4 ± 3.2 s (192 ± 22 m). A significant decrease in $$ \dot{V}{{{\text{O}}_{ 2} }} $$ (P < 0.05) was observed in all subjects during the last 100 m, although the velocity did not decrease below $$ {\text{v}}-\dot{V}_{{{\text{O}}_{{ 2 {\text{max}}}} }} . $$ The $$ \dot{V}{{{\text{O}}_{ 2} }} $$ in the last 5 s was correlated with the pH (r = 0.86, P < 0.0005) and $$ \left[ {{\text{HCO}}_{ 3}^{ - } } \right] $$ (r = 0.70, P < 0.05) measured at the end of 300T. Additionally, the velocity decrease observed in the last 100 m was inversely correlated with $$ \left[ {{\text{HCO}}_{ 3}^{ - } } \right] $$ and pH at 300T (r = −0.83, P < 0.001, r = −0.69, P < 0.05, respectively). These track running data demonstrate that acidosis at 300 m was related to both the $$ \dot{V}{{{\text{O}}_{ 2} }} $$ response and the velocity decrease during the final 100 m of a 400-m run.
Starting Page	233
Ending Page	240
Page Count	8
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	109
Issue Number	2
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-01-09
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Long sprint running Buffer capacity pH Bicarbonate Sports Medicine Occupational Medicine/Industrial Medicine Human Physiology
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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