caa a22 4500 467939853 CHVBK 20180406153009.0 cr unu---uuuuu 170328e20060901xx s 000 0 eng 10.1007/s00421-006-0243-4 doi (NATIONALLICENCE)springer-10.1007/s00421-006-0243-4 Effect of altered pre-exercise carbohydrate availability on selection and perception of effort during prolonged cycling [Elektronische Daten] [N. Johnson, S. Stannard, P. Chapman, M. Thompson] This study assessed the effect of altered carbohydrate (CHO) availability on self-selected work rate during prolonged time-trial cycling. Eight endurance-trained men undertook two experimental cycling time-trials after glycogen-depleting exercise and 2days of: (a) high (9.3±0g CHO kg−1day−1) (HC) and (b) low CHO intakes (0.6±0.1g CHO kg−1day−1) (LC), via a double-blinded crossover design. All feedback regarding performance was removed during both exercise trials. Self-selected external power output was not different during the first 2h of exercise between experimental conditions (P>0.05), despite reported sensations of increased tiredness before and during exercise, significantly reduced whole body CHO oxidation (P<0.05), plasma lactate concentrations (P<0.05) and earlier onset of fatigue during exercise in LC versus HC. Perceived exertion was not different throughout exercise between conditions (P>0.05). Mean power output declined significantly in LC versus HC (P<0.05) after∼2h of exercise, and was associated with significant reductions in cadence, heart rate and plasma glucose concentration (P<0.05). These results demonstrate that when compared with time-trial cycling performed after a HC diet, reduced CHO availability does not initially alter self-selected work rate in endurance athletes who are deceived of their CHO status prior to exercise. This finding suggests that reduced work rate during exercise following lowered CHO intake may, in part, be a consequence of the subject's awareness of dietary CHO restriction rather than solely a physiologically mediated action. Further research is required to distinguish the influence of circulating glucose and peripheral glycogen availability on pacing strategy during prolonged exercise. Springer-Verlag, 2006 Endurance exercise nationallicence High fat diet nationallicence Perceived exertion nationallicence Fatigue nationallicence Pacing strategy nationallicence Johnson N. The School of Exercise and Sport Science, The University of Sydney, 1825, Lidcombe, Australia aut Stannard S. The School of Exercise and Sport Science, The University of Sydney, 1825, Lidcombe, Australia aut Chapman P. The School of Exercise and Sport Science, The University of Sydney, 1825, Lidcombe, Australia aut Thompson M. The School of Exercise and Sport Science, The University of Sydney, 1825, Lidcombe, Australia aut European Journal of Applied Physiology Springer-Verlag 98/1(2006-09-01), 62-70 1439-6319 98:1<62 2006 98 421 https://doi.org/10.1007/s00421-006-0243-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-006-0243-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Johnson N. The School of Exercise and Sport Science, The University of Sydney, 1825, Lidcombe, Australia aut NATIONALLICENCE 700 1- Stannard S. The School of Exercise and Sport Science, The University of Sydney, 1825, Lidcombe, Australia aut NATIONALLICENCE 700 1- Chapman P. The School of Exercise and Sport Science, The University of Sydney, 1825, Lidcombe, Australia aut NATIONALLICENCE 700 1- Thompson M. The School of Exercise and Sport Science, The University of Sydney, 1825, Lidcombe, Australia aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 98/1(2006-09-01), 62-70 1439-6319 98:1<62 2006 98 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer