european college of sport science

OP-PH11 Physiology 11
Results: TTF was not significantly different between TRAIN and CON at baseline (427 +/- 80 vs 449 +/- 101 s), but was significantly different
at the final TTF test (375 +/- 71 vs 562 +/- 105 s; P< 0.05). For TRAIN, [BLa] measured at fatigue during the final TTF test (12.5 +/- 4.2
mmol/L) was not significantly different from the [BLa] measured at 75% of TTF on Day 1 (12.9 +/- 3.3 mmol/L), but was significantly less
than the [BLa] measured at 100% of TTF on Day 1 (16.4 +/- 3.9 mmol/L). However, in TRAIN, both endVO2 and RPE during the final TTF test
(54.9 +/- 6.9 mL/kg/min and 18 +/- 2 respectively) were significantly greater than the values recorded at 75% (49.8 +/- 4.2 mL/kg/min
and 16 +/- 1), but not 100%, of TTF on Day 1 (53.7 +/- 5.8 mL/kg/min and 18 +/- 1).
Discussion: HIT resulted in significant performance decrements as assessed by the TTF test. These results are comparable to those of Fry
et al. (3) who showed decreased TTF in 5 well-trained men after a period of intense training performed 2/day for ten days. The earlier
task failure was not associated with the earlier accumulation of maximal levels of blood lactate. This is consistent with our previous
results showing that fatigue is not related to muscle lactate levels (1). However, the earlier task failure was associated with the earlier
attainment of VO2peak and the earlier sensation of fatigue. Future research should therefore examine additional mechanisms that may
be associated with the earlier attainment of task failure following overtraining.
References
1. Edge, J., D. Bishop, & C. Goodman. J Appl Physiol. 101:918-925, 2006.
2. Edge, J., D. Bishop, C. Goodman. Med Sci Sports Exerc. 37:1975-1982, 2005.
3. Fry, R. W., et al. Br. J. Sports Med. 28:241-246, 1994.
4. Fry, R. W., A. R. Morton, & D. Keast. Sports Med. 12:32-65, 1991.
THE EFFECTS OF INTERVAL VS. HEAVY CONTINUOUS EXERCISE PROGRAMS ON OXYGEN CONSUMPTION, HEART
RATE, AND LACTATE RESPONSES IN ADOLESCENTS
ZAFEIRIDIS, A., SARIVASILIOU, H., DIPLA, K., VRABAS, I.
ARISTOTLE UNIVERSITY OF THESSALONIKI AT SERRES
Short and long high-intensity intermittent exercise (SIE and LIE), as well as continuous exercise (CE) have been consistently used to improve
aerobic performance. Studies in adults have reported that SIE elicits greater VO2 responses compared to moderate intensity (50-75%
VO2max) CE. However, when CE is performed at heavy intensity (above lactate thresholds for ~25min) a slow component that is developed
drives the metabolic rate closer to VO2max. No study has compared VO2 responses among SIE, LIE, and heavy CE. The study of
VO2 response during different aerobic regimens is essential since it characterizes the exercise stimulus and thereby aerobic adaptations.
The VO2 responses to exercise depend also on VO2 kinetics that is likely to be different during growth from those of adults. Thus, this
study compared the physiological responses of SIE, LIE, and heavy CE, matched for exhaustion, in young adolescents. Nine teens (14 yrs.)
performed a treadmill test to assess VO2max (55.5±4.6ml/kg/min), vVO2max (15±0.5km/h), and HRmax (200±4bpm). Then, they performed
a SIE (30s at 110% vVO2max with 30s recovery at 50% vVO2max), a LIE (3min at 95% vVO2max with 3min recovery at 35%
vVO2max) and a heavy CE (at 83% vVO2max). End-point for all protocols was a HR of 5bpm below HRmax. VO2 and HR were continuously
measured and blood samples were obtained prior and after protocols to determine lactate (La-mmol/L). The results (mean ±SE) for
LIE are presented including only exercise (LIE-EXE) for mean responses, and exercise and recovery times (LIE-PR) for times spent above
85%, 90%, and 95% VO2max. The time (min) of CE (22.4±1.9) and LIE-PR (28.3±2.8) were longer (p