engleski

Excess post exercise oxygen consumption in sprinters, middle distance, long distance and 400m runners

The post exercise elevation in resting metabolism has been labeled as the excess post exercise oxygen consumption (EPOC). Different approaches, and a number of exercise manipulations have been employed in order to determine the EPOC response. Variations in exercise duration and intensity received the most attention, and effects of exercise mode, body core temperature, and nutritional status have also been examined. Aerobic and anaerobic fitness status may also influence EPOC, since the physiological adaptations of trained individuals alter many aspects of exercise metabolism. The aim of this study was to examine the differences in EPOC during the first five minutes of recovery (EPOC5) between runners competing in running events with different aerobic and anaerobic metabolic demands. Forty-eight national level male runners, competing in running events with predominantly aerobic (AERO) or anaerobic (ANAERO) metabolic demands: 25 ANAERO (10 sprinters (S) (184.9 +/- 4.8 cm, 76.6 +/- 4.8 kg) and fifteen 400m runners (S4) (180.9 +/- 4.2 cm, 73.0 +/- 6.3 kg)), and 23 AERO (10 middle distance (MD) (180.4 +/- 5.7 cm, 68.6 +/- 6.2 kg) and 13 long distance (LD) (n=13 ; 179.1 +/- 6.7 cm, 69.5 +/- 7.0 kg)) runners participated in the study. All subjects performed an incremental treadmill test (1 km/h speed increase per minute, 1.5% grade) to volitional exhaustion, and walked at 5 km/h-1 during the first five minutes of recovery. The EPOC of the first two minutes, and from the third to fifth minute of recovery were termed as the fast and slow EPOC components (EPOCF, EPOCS), respectively. The analysis of variance was used to determine differences in observed variables between the groups. With increasing track length covered by the runner for a given running event, a progressive increase of aerobic capacity parameters (VO2max and anaerobic threshold, AnT) was also determined. The groups differed significantly regarding both VO2max and AnT (p<0.01), but not in EPOC5 (ANAERO: 65.1&#177; ; 6.8 and 69.7&#177; ; 9.5 ml/kg for S and S4, respectively ; AERO: 72.0&#177; ; 11.1 and 70.2&#177; ; 10.1 ml/kg for MD and LD, respectively). EPOCF was significantly lower in ANAERO than in AERO (45.7&#177; ; 4.8 ml/kg : 51.3&#177; ; 5.8 ml/kg, p<0.01), while EPOCS, on the contrary, had a trend toward higher values in sprinters (21.3&#177; ; 3.4 and 22.7&#177; ; 5.1 ml/kg for S and S4, respectively) than in AERO runners (20.0&#177; ; 4.9 and 19.5&#177; ; 5.4 ml/kg for MD and LD), (p=0.09). The present study demonstrates that the EPOC of the first 5 minutes of recovery after a standard VO2max test does not give an estimation of the maximal oxygen debt. However, if we subtract the oxygen debt of the first two minutes of recovery, EPOCS, i.e. the EPOC from the third to the fifth minute of recovery, might be used to estimate the anaerobic glycolitic capacity of the subjects.

excess post exercise oxygen consumption; runners

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