TY - JOUR
T1 - Influence of nitrate supplementation on VO(2) kinetics and endurance of elite cyclists
AU - Christensen, Peter Møller
AU - Nyberg, Michael Permin
AU - Bangsbo, Jens
N1 - CURIS 2013 NEXS 009
PY - 2013/2
Y1 - 2013/2
N2 - The present study examined if an elevated nitrate intake would improve VO2 kinetics, endurance, and repeated sprint capacity in elite endurance athletes. Ten highly trained cyclists (72±4mL O2/kg/min, mean±standard deviation) underwent testing for VO2 kinetics (3×6min at 298±28W), endurance (120min preload followed by a 400-kcal time trial), and repeated sprint capacity (6×20s sprints, recovery 100s) during two 6-day periods in randomized order with a daily ingestion of either 0.5L beetroot (BR) juice to increase nitrate levels or a 0.5L placebo (PLA) drink with blackcurrant juice. Plasma NOx (nitrate+nitrite) levels were higher (P<0.01) in BR (147±102 and 159±103μM after 4 and 6 days of beverage intake, respectively) compared with PLA (41±10 and 40±7μM). VO2 kinetics and exercise economy were the same in BR and PLA. Time-trial performance was similar with an average completion time of 18:20 and 18:37min:s in BR and PLA, respectively, with average power outputs of 290±43W in BR and 285±44W in PLA. Peak and mean power during repeated sprinting were similar in BR and PLA. In contrast to observations in moderately trained subjects intake of BR juice had no effect on VO2 kinetics and performance in elite cyclists.
AB - The present study examined if an elevated nitrate intake would improve VO2 kinetics, endurance, and repeated sprint capacity in elite endurance athletes. Ten highly trained cyclists (72±4mL O2/kg/min, mean±standard deviation) underwent testing for VO2 kinetics (3×6min at 298±28W), endurance (120min preload followed by a 400-kcal time trial), and repeated sprint capacity (6×20s sprints, recovery 100s) during two 6-day periods in randomized order with a daily ingestion of either 0.5L beetroot (BR) juice to increase nitrate levels or a 0.5L placebo (PLA) drink with blackcurrant juice. Plasma NOx (nitrate+nitrite) levels were higher (P<0.01) in BR (147±102 and 159±103μM after 4 and 6 days of beverage intake, respectively) compared with PLA (41±10 and 40±7μM). VO2 kinetics and exercise economy were the same in BR and PLA. Time-trial performance was similar with an average completion time of 18:20 and 18:37min:s in BR and PLA, respectively, with average power outputs of 290±43W in BR and 285±44W in PLA. Peak and mean power during repeated sprinting were similar in BR and PLA. In contrast to observations in moderately trained subjects intake of BR juice had no effect on VO2 kinetics and performance in elite cyclists.
U2 - 10.1111/sms.12005
DO - 10.1111/sms.12005
M3 - Journal article
C2 - 23020760
SN - 0905-7188
VL - 23
SP - e21-e31
JO - Scandinavian Journal of Medicine & Science in Sports
JF - Scandinavian Journal of Medicine & Science in Sports
IS - 1
ER -