TY - JOUR
T1 - Metabolic and neuromuscular responses at critical power from the 3-min all-out test
AU - Bergstrom, Haley C.
AU - Housh, Terry J.
AU - Zuniga, Jorge M.
AU - Traylor, Daniel A.
AU - Lewis, Robert W.
AU - Camic, Clayton L.
AU - Schmidt, Richard J.
AU - Johnson, Glen O.
PY - 2013/1
Y1 - 2013/1
N2 - The purpose of this study was to determine the specific metabolic and neuromuscular responses at critical power (CP) from the 3-min all-out test. Nine men (mean ± SD: aged 23.7 ± 3.3 years) performed an incremental test for the determination of peak oxygen consumption (VO2peak) and gas exchange threshold. CP was estimated for each subject from the 3-min all-out test. Oxygen consumption (VO2), the ventilation versus carbon dioxide production ratio (VE/VCO2 ratio), electromyographic (EMG) amplitude, and EMG mean power frequency (MPF) were examined during exhaustive rides at CP for each subject. There was no significant difference between theVO2 at exhaustion (40.6 ± 7.5 mL·kg-1·min-1) andVO2peak (42.9 ± 7.3 mL·kg-1·min-1). Furthermore, there were significant increases in EMG amplitude and the VE/VCO2 ratio during the exhaustive rides at CP. There was, however, no significant change in EMG MPF over time. Therefore, the current findings indicated that the 3-min all-out test overestimated CP and the demarcation between the heavy- and severe-intensity domains. Specifically, theVO2, ventilatory, and EMG amplitude responses were consistent with those observed during continuous exercise in the severe exercise intensity domain. It is likely that the ventilatory and EMG amplitude responses were associated with a common mechanism of fatigue that is different from what affects EMG MPF.
AB - The purpose of this study was to determine the specific metabolic and neuromuscular responses at critical power (CP) from the 3-min all-out test. Nine men (mean ± SD: aged 23.7 ± 3.3 years) performed an incremental test for the determination of peak oxygen consumption (VO2peak) and gas exchange threshold. CP was estimated for each subject from the 3-min all-out test. Oxygen consumption (VO2), the ventilation versus carbon dioxide production ratio (VE/VCO2 ratio), electromyographic (EMG) amplitude, and EMG mean power frequency (MPF) were examined during exhaustive rides at CP for each subject. There was no significant difference between theVO2 at exhaustion (40.6 ± 7.5 mL·kg-1·min-1) andVO2peak (42.9 ± 7.3 mL·kg-1·min-1). Furthermore, there were significant increases in EMG amplitude and the VE/VCO2 ratio during the exhaustive rides at CP. There was, however, no significant change in EMG MPF over time. Therefore, the current findings indicated that the 3-min all-out test overestimated CP and the demarcation between the heavy- and severe-intensity domains. Specifically, theVO2, ventilatory, and EMG amplitude responses were consistent with those observed during continuous exercise in the severe exercise intensity domain. It is likely that the ventilatory and EMG amplitude responses were associated with a common mechanism of fatigue that is different from what affects EMG MPF.
KW - Cycling
KW - Exercise intensity
KW - Muscle fatigue
KW - Physiological assessment
UR - http://www.scopus.com/inward/record.url?scp=84873472306&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84873472306&partnerID=8YFLogxK
U2 - 10.1139/apnm-2012-0216
DO - 10.1139/apnm-2012-0216
M3 - Article
C2 - 23368822
AN - SCOPUS:84873472306
SN - 1715-5312
VL - 38
SP - 7
EP - 13
JO - Applied Physiology, Nutrition and Metabolism
JF - Applied Physiology, Nutrition and Metabolism
IS - 1
ER -