A Fast-Start Pacing Strategy Speeds Pulmonary Oxygen Uptake Kinetics and Improves Supramaximal Running Performance

作者：Turnes Tiago; Salvador Amadeo Felix; Li**oa Felipe Domingos; de Aguiar Rafael Alves; de Oliveira Cruz Rogerio Santos; Caputo Fabrizio^*

来源：PLos One, 2014, 9(10): e111621.

DOI：10.1371/journal.pone.0111621

The focus of the present study was to investigate the effects of a fast-start pacing strategy on running performance and pulmonary oxygen uptake ((V) over dotO(2)) kinetics at the upper boundary of the severe-intensity domain. Eleven active male participants (28 +/- 10 years, 70 +/- 5 kg, 176 +/- 6 cm, 57 +/- 4 mL/kg/min) visited the laboratory for a series of tests that were performed until exhaustion: 1) an incremental test; 2) three laboratory test sessions performed at 95, 100 and 110% of the maximal aerobic speed; 3) two to four constant speed tests for the determination of the highest constant speed (HS) that still allowed achieving maximal oxygen uptake; and 4) an exercise based on the HS using a higher initial speed followed by a subsequent decrease. To predict equalized performance values for the constant pace, the relationship between time and distance/speed through log-log modelling was used. When a fast-start was utilized, subjects were able to cover a greater distance in a performance of similar duration in comparison with a constant-pace performance (constant pace: 670 m +/- 22%; fast-start: 683 m +/- 22%; P = 0.029); subjects also demonstrated a higher exercise tolerance at a similar average speed when compared with constant-pace performance (constant pace: 114 s +/- 30%; fast-start: 125 s +/- 26%; P = 0.037). Moreover, the mean (V) over dotO(2) response time was reduced after a fast start (constant pace: 22.2 s +/- 28%; fast-start: 19.3 s +/- 29%; P = 0.025). In conclusion, middle-distance running performances with a duration of 2-3 min are improved and (V) over dotO(2) response time is faster when a fast-start is adopted.

• 出版日期2014-10-31