Nitrate supplementation does not alter the V̇O2p SC-muscle fatigue relationship in recreationally active men

The current study assessed alterations to the linear V̇O2p slow component (V̇O2p SC)-muscle fatigue development relationship using dietary nitrate (NO3- ) supplementation during very heavy (VH)-intensity constant-work rate cycling exercise. Using a double- blind, block-randomised, crossover design, 8 healthy men (age, 24±2 yr [mean±SD]; V̇O2p-max, 43.8±6.0 mL/kg/min) consumed NO3- -rich (BRJ) or -depleted (PLAC) beetroot juice daily for 20 d. Participants completed pre/post-condition incremental leg cycling V̇O2p-max and 3-min “sprint” verification exercises. An initial 5 d loading phase was followed, on alternate days, by single trials of VH- or moderate-intensity exercise at select time points with a 14 d washout period separating conditions. Muscle fatigue was assessed pre/post- exercise by electrically stimulated quadriceps muscle torque production. NO3- supplementation had no effect on the development of the V̇O2p SC amplitude or muscle fatigue or the linear relationship between the two variables (slope = 6.85 (BRJ) vs. 8.34 (PLAC) (mL/min)/(10/50 Hz ratio; P = 0.628).

Name thesis:degree_name

M Sc

Discipline thesis:degree_discipline

Kinesiology

Grantor dc:publisher

The University of Western Ontario

Year dc:date.issued

2019

Author dc:creator

• Vanhie, James Joseph George

Advisor dc:contributor.advisor

• Kowalchuk, John M.

• Nitrate
• nitrite
• beetroot juice
• VO2p slow component
• muscle fatigue
• exercise

Language dc:language.iso

en_ca

Handle dc:identifier.uri

https://hdl.handle.net/20.500.14721/29319

OAI identifier oai:identifier

oai:uwo.scholaris.ca:20.500.14721/29319