Oxygen uptake and blood metabolic responses to a 400-m run
Tóm tắt
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.
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