PMID- 9134360
OWN - NLM
STAT- MEDLINE
DCOM- 19970718
LR  - 20131121
IS  - 0301-5548 (Print)
IS  - 0301-5548 (Linking)
VI  - 75
IP  - 4
DP  - 1997
TI  - Metabolic and performance adaptations to interval training in endurance-trained 
      cyclists.
PG  - 298-304
AB  - This study examined the effects of sustained high-intensity interval training 
      (HIT) on the athletic performances and fuel utilisation of eight male 
      endurance-trained cyclists. Before HIT, each subject undertook three baseline 
      peak power output Wpeak tests and two simulated 40-km time-trial cycling 
      performance (TT40) tests, of which the variabilities were 1.5 (1.3)% and 1.0 
      (0.5)%, respectively [mean (SD)]. Over 6 weeks, the cyclists then replaced 15 
      (2)% of their 300 (66) km.week-1 endurance training with 12 HIT sessions, each 
      consisting of six to nine 5-min rides at 80% of Wpeak, separated by a l-min 
      recovery. HIT increased Wpeak from 404 (40) to 424 (53) W (P < 0.01) and improved 
      TT40 speeds from 42.0 (3.6) to 43.0 (4.2) km.h-1 (P < 0.05). Faster TT40 
      performances were due to increases in both the absolute work rates from 291 (43) 
      to 327 (51) W (P < 0.05) and the relative work rates from 72.6 (5.3)% of pre-HIT 
      Wpeak to 78.1 (2.8)% of post-HIT Wpeak (P < 0.05). HIT decreased carbohydrate 
      (CHO) oxidation, plasma lactate concentration and ventilation when the cyclists 
      rode at the same absolute work rates of 60, 70 and 80% of pre-HIT Wpeak (P < 
      0.05), but not when they exercised at the same relative (% post-HIT Wpeak) work 
      rates. Thus, the ability of the cyclists to sustain higher percentages of Wpeak 
      in TT40 performances after HIT was not due to lower rates of CHO oxidation. 
      Higher relative work rates in the TT40 rides following HIT increased the 
      estimated rates of CHO oxidation from approximately 4.3 to approximately 5.1 
      g.min-1.
FAU - Westgarth-Taylor, C
AU  - Westgarth-Taylor C
AD  - Department of Physiology, University of Cape Town Medical School, Observatory, 
      South Africa.
FAU - Hawley, J A
AU  - Hawley JA
FAU - Rickard, S
AU  - Rickard S
FAU - Myburgh, K H
AU  - Myburgh KH
FAU - Noakes, T D
AU  - Noakes TD
FAU - Dennis, S C
AU  - Dennis SC
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - Germany
TA  - Eur J Appl Physiol Occup Physiol
JT  - European journal of applied physiology and occupational physiology
JID - 0410266
RN  - 33X04XA5AT (Lactic Acid)
SB  - IM
MH  - Adaptation, Physiological/*physiology
MH  - Adult
MH  - *Carbohydrate Metabolism
MH  - Exercise/*physiology
MH  - Humans
MH  - Lactic Acid/metabolism
MH  - Male
MH  - Pulmonary Ventilation/physiology
MH  - Sports/*physiology
MH  - Task Performance and Analysis
EDAT- 1997/01/01 00:00
MHDA- 1997/01/01 00:01
CRDT- 1997/01/01 00:00
PHST- 1997/01/01 00:00 [pubmed]
PHST- 1997/01/01 00:01 [medline]
PHST- 1997/01/01 00:00 [entrez]
AID - 10.1007/s004210050164 [doi]
PST - ppublish
SO  - Eur J Appl Physiol Occup Physiol. 1997;75(4):298-304. doi: 10.1007/s004210050164.