Mechanomyographic and metabolic responses during continuous cycle ergometry at critical power from the 3-min all-out test (original) (raw)

2013, Journal of Electromyography and Kinesiology

There are limited data regarding metabolic responses during continuous exhaustive rides at critical power (CP) from the 3-min all-out test. In addition, no previous studies have examined the mechanomyographic (MMG) responses at CP from the 3-min all-out test. Therefore, this study examined the metabolic and MMG responses during continuous exercise at CP determined from the 3-min all-out test. Nine college-aged females (mean ± SD: age 23.0 ± 3.6 yrs) performed an incremental test to exhaustion on a cycle ergometer to identify the gas exchange threshold, peak oxygen consumption rate (_ VO 2 peak) and heart rate peak (HR peak). The _ VO 2 , HR, MMG amplitude and mean power frequency (MPF) responses were examined during continuous rides to exhaustion at CP (81 ± 6% peak power). There were significant increases in _ VO 2 and HR over time and there was no significant difference between _ VO 2 peak and _ VO 2 at exhaustion or HR peak and HR at exhaustion. There were, however, no significant changes for MMG amplitude or MPF over time. Therefore, the current findings suggested that the 3-min all-out test overestimated CP and the demarcation between the heavy and severe intensity domains. Specifically, the _ VO 2 and HR responses did not reach a steady state and were driven to peak values. Furthermore, the non-significant change in MMG amplitude and MPF were consistent with the responses observed at fatiguing power outputs (i.e., >80% peak power).

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Mechanomyographic and metabolic responses during continuous cycle ergometry at critical power from the 3-min all-out test (original) (raw)

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