Metabolic profile of high intensity intermittent exercises

Abstract

To evaluate the magnitude of the stress on the aerobic and the anaerobic energy release systems during high intensity bicycle training, two commonly used protocols (IE1 and IE2) were examined during bicycling. IE1 consisted of one set of 6-7 bouts of 20-s exercise at an intensity of approximately 170% of the subject's maximal oxygen uptake (VO2max) with a 10-s rest between each bout. IE2 involved one set of 4-5 bouts of 30-s exercise at an intensity of approximately 200% of the subject's VO2max and a 2-min rest between each bout. The accumulated oxygen deficit of IE1 (69 +/- 8 ml.kg-1, mean +/- SD) was significantly higher than that of IE2 (46 +/- 12 ml.kg-1, N = 9, p < 0.01). The accumulated oxygen deficit of IE1 was not significantly different from the maximal accumulated oxygen deficit (the anaerobic capacity) of the subjects (69 +/- 10 ml.kg-1), whereas the corresponding value for IE2 was less than the subjects' maximal accumulated oxygen deficit (P < 0.01). The peak oxygen uptake during the last 10 s of the IE1 (55 +/- 6 ml.kg-1.min-1) was not significantly less than the VO2max of the subjects (57 +/- 6 ml.kg-1.min-1). The peak oxygen uptake during the last 10 s of IE2 (47 +/- 8 ml.kg-1.min-1) was lower than the VO2max (P < 0.01). In conclusion, this study showed that intermittent exercise defined by the IE1 protocol may tax both the anaerobic and aerobic energy releasing systems almost maximally.

Physiological And Performance Effects Of Crossfit

“…Improvements in aerobic and anaerobic capacity have been noted in previous studies that predominantly used high-intensity training (Bayati, et al, 2011;Lindsay, et al, 1996;Westgarth-Taylor, et al, 1997;Tabata, et al, 1996;Tabata, et al, 1997;Hottenrott, et al, 2010;Acevedo & Godfarb, 1989;Garber, et al, 2011;Midgley, et al, 2006). These studies have noted an improvement in aerobic capacity, anaerobic capacity, peak power output, peak sustained power, maximum blood lactate levels, and time to fatigue.…”

“…This same HIIT protocol was also used in another study performed by Tabata, Irisawa, Kouzaki, Nishimura, Ogita, and Miyachi, (1997) in order to compare it to another HIIT protocol, evaluating their effects on aerobic and anaerobic capacity. The second protocol consisted of four to five bouts of exercise performed at 200% of VO 2 max for 30 seconds, with two minutes of rest between each bout of exercise.…”

“…The main findings reported by the authors were that the accumulated oxygen deficit and oxygen uptake were close to the maximum obtainable for the first protocol (20 seconds of work, 10 seconds of rest), but not for the other HIIT protocol (30 seconds of work, two minutes of rest). The authors stated that these results were important because "it shows that the first protocol stressed the anaerobic and aerobic energy systems, while the second protocol did not, therefore in order to improve both energy systems, the first protocol appeared to be superior to the other HIIT protocol" (Tabata, et al, 1997).…”

Effects of Recovery Mode on Performance, O2 Uptake, and O2 Deficit During High-Intensity Intermittent Exercise

“…Several assumptions are made, however. The most critical is that there should be a way to estimate energy demand during supramaximal exercise from measurements obtained during submaximal exercise (Medbo et al, 1988;Medbo and Tabata, 1989;Saltin, 1990;Tabata et al, 1997).…”

A ingestão de bicarbonato de sódio pode contribuir para o desempenho em lutas de judô?

“…It consists of a series of supra-maximal exertions (with mean duration of 15 to 30 seconds), alternated with 10 to 15 seconds of recovery (1) . In these short intervals, there is not sufficient time for a suitable ATP resynthesis by the aerobic ways, which makes these exertions highly dependant on the lactic anaerobic way (2) . The importance of the glycolytic anaerobic way of energy production for judo may be demonstrated by the high blood lactate concentration in athletes of this modality (3) .…”