Oxygen Uptake Response to an 800-m Running Race

Abstract

We tested the hypothesis that time course of O (2) uptake (VO (2)) measured during a supramaximal exercise performed in the field is driven to maximal oxygen uptake (VO (2max)). On an outdoor track, five middle-distance male runners first performed a test to determine VO (2max) and a supramaximal 800-m running test at least two days apart. VO (2) response was measured from the start to the end of exercise with the use of a miniaturised telemetric gas exchange system (Cosmed K4). VO (2max) was reached by all subjects 45 +/- 11 s (mean +/- SD) after the onset of the 800-m race (i.e., 316 +/- 75 m), and was maintained during the next 33 +/- 6 s (i.e., 219 +/- 41 m). The mean relative exercise intensity of the 800 m was 120 % VO (2max). An unexpected significant decrease in VO (2) (24.1 +/- 7.0 %; p < 0.05) was observed in all subjects during the final 38 +/- 17 s (i.e., the last 265 +/- 104 m). We concluded that, at onset of a simulated 800 m running event, VO (2) is quickly projected towards the VO (2max), and then becomes limited by the achievable VO (2max). This race profile shown by all athletes is in some contrast to what can be expected from earlier findings in a laboratory setting.

Effect of performance level on pacing strategy during a 10-km running race

“…The fast-start velocities, relative to their averages mean velocity, employed by HP group is consistent with the results obtained in other studies with middle-distancerunning (Duffield et al 2006;Hanon et al 2007;Thomas et al 2005) and cycling time-trial events (Atkinson et al -0.07 0.29 0.23 0.27 _ VO 2 9 km h À1 (mL kg À1 min À1 Þ -0.49 -0.68* -0.59* -0.68* _ VO 2 12 km h À1 (mL kg À1 min À1 Þ -0.77** -0.93** -0.64* -0.92** _ VO 2 15 km h À1 (mL kg À1 min À1 Þ -0.11 -0.35 -0.39 -0.35 ½La À1 net 9 km h À1 ðmmol L À1 Þ 0.20 0.14 0.38 0.16 ½La À1 net 12 km h À1 ðmmol L À1 Þ -0.31 -0.53* -0.33 -0.52* ½La À1 net 15 km h À1 ðmmol L À1 Þ -0.50* -0.79** -0.67* -0.78** PV peak running velocity, OBLA onset blood of lactate accumulation, LT lactate threshold, _ VO 2 9 km h À1 oxygen uptake at 9 km h -1 , _ VO 2 12 km h À1 oxygen uptake at 12 km h -1 , _ VO 2 15 km h À1 oxygen uptake at 15 km h -1 , ½La À1 net 9 km h À1 net blood lactate accumulation at 9 km h -1 , ½La À1 net 12 km h À1 net blood lactate accumulation at 12 km h -1 , ½La À1 net 15 km h À1 net blood lactate accumulation at 15 km h -1 * P \ 0.05, ** P \ 0.01 2007b; Mattern et al 2001;Perrey et al 2003;Tucker et al 2006). While a 10-km running race is considerably longer than most previous studies which have suggested a beneficial effect of a fast start (Hanon et al 2007;Duffield et al 2006), Atkinson et al (2007b) have also reported a powerful start in an 800-kJ (*27 min) cycling time trial, which was 14% above the mean power output over the entire event.…”

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

“…This large anaerobic contribution, and subsequent accumulation of metabolites (Kindermann et al 1977), may contribute to the decrease in velocity observed during the final 100 m of a 400-m race (Hanon and Gajer 2009). However, while this decrease in velocity has been reported to occur concomitantly with a decrease in _ VO 2 during a 800-m race (Thomas et al 2005), it is not known if this also occurs during a 400-m race.…”

“…The adoption of such a fast-start procedure induces a higher peak oxygen uptake _ VO 2max À Á compared with other pacing strategies (Bishop et al 2002;Sandals et al 2006). While athletes are able to reach their maximal oxygen uptake during a simulated 800-m race (Thomas et al 2005), previous results have indicated that the peak oxygen uptake reached during a 400-m running race or maximal exercise of equivalent duration (&1 min) is between 80 and 90% of _ VO 2max (Duffield et al 2005;Nummela and Rusko 1995;Spencer and Gastin 2001). However, further research is required as these studies did not exactly replicate the competition race conditions (e.g.…”

Estratégia De Prova Em Patinação De Velocidade No Gelo: Influência Do Gênero E Nível De Desempenho Das Provas De 1.500M

“…Com o objetivo de realizar uma prova o mais rápido possível e evitar que a exaustão ocorra antes do final da mesma, os atletas adotam algum tipo de estratégia 1,4,5 . Em particular, é bem documentado que em provas de curta e média duração os atletas adotam uma estratégia de saída rápida, com posterior declínio na velocidade no final da prova 1,[6][7][8] . De fato, tem sido demonstrado que em esportes com características cíclicas, tais como o ciclismo, corrida, remo e natação 6,[9][10][11] , é comum os atletas adotarem algum tipo de estratégia de prova, pois uma distribuição ótima da velocidade/potência durante tais eventos, provavelmente, terá influência direta no desempenho 2 .…”