Article

Determination of critical power using a 3-min all-out cycling test

Department of Sport and Exercise Science, University of Wales, Aberystwyth, United Kingdom.
Medicine &amp Science in Sports &amp Exercise (Impact Factor: 4.46). 04/2007; 39(3):548-55. DOI: 10.1249/mss.0b013e31802dd3e6
Source: PubMed

ABSTRACT We tested the hypothesis that the power output attained at the end of a 3-min all-out cycling test would be equivalent to critical power.
Ten habitually active subjects performed a ramp test, two 3-min all-out tests against a fixed resistance to establish the end-test power (EP) and the work done above the EP (WEP), and five constant-work rate tests to establish the critical power (CP) and the curvature constant parameter (W') using the work-time and 1/time models.
The power output in the 3-min trial declined to a steady level within 135 s. The EP was 287 +/- 55 W, which was not significantly different from, and highly correlated with, CP (287 +/- 56 W; P = 0.37, r = 0.99). The standard error for the estimation of CP using EP was approximately 6 W, and in 8 of 10 cases, EP agreed with CP to within 5 W. Similarly, the WEP derived from the 3-min test (15.0 +/- 4.7 kJ) was not significantly different from, and correlated with, W' (16.0 +/- 3.8 kJ; P = 0.35; r = 0.84).
During a 3-min all-out cycling test, power output declined to a stable value in approximately the last 45 s, and this power output was not significantly different from the independently measured critical power.

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    • "Following a standardized warm-up, which included 10 bodyweight squats and 10 alternating lunges, the participant completed 60 seconds of unloaded cycling at 90 rpm, followed by an all-out three-minute effort with resistance being set as a function of pedaling rate (Vanhatalo et al., 2007). Participants were asked to accelerate to approximately 110 rpm over the last 5 s of the baseline period. "
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    ABSTRACT: To evaluate the time course of EMG frequency changes during a three-minute maximal effort cycling test (3MT) session and to examine which parameter between mean (MNF) and median (MDF) frequency is more suitable for evaluation of changes in neuromuscular function throughout a 3MT. Eighteen recreationally-active men volunteered to participate in this study. Maximum voluntary contraction (MVC) was measured using a dynamometer to determine maximal EMG frequency of the vastus lateralis (VL) of the kicking leg during isometric knee extension. A maximal oxygen consumption test (VO2peak) on a cycle ergometer was performed to establish the appropriate load profile for the 3MT which was completed after a period of at least 48 hours. MNF, MDF and power output (PO) values were measured at 10-second epochs throughout the duration of the 3MT. Repeated measures analysis of variance was used to compare the changes in EMG frequency, relative to maximal values from the MVC, and change in PO during the testing procedure. MNF, Root Mean Square (RMS), and PO significantly decreased during the 3MT, while MDF did not change significantly. Statistically, EMG frequency and PO decreased at first and remained constant in response to the 3MT, which may be reflective of differing patterns of muscle fiber type fatigue throughout the testing session. Due to decreased variability, changes in neuromuscular function during this protocol may be better evaluated using MNF than MDF. Key pointsEMG frequency decreased initially and remained constant in response to all-out cycling test.The change in EMG frequency and power output were similar during all-out cycling test.MNF may be better than MDF for neuromuscular function evaluation during all-out cycling test due to decreased variability.
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    • "It is generally recommended that a preliminary 3Mt be completed on a separate occasion prior to the 3Mt of interest (Jones et al. 2010; Vanhatalo et al. 2007). this familiarisation trial is deemed necessary to ensure that valid estimates of cP and W′ are obtained during the experimental 3Mt (Vanhatalo et al. 2007; Jones et al. 2010; Burnley et al. 2006b). the current study design did not include a familiarisation trial, because it would have required an additional visit to the laboratory. "
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    Arbeitsphysiologie 02/2014; DOI:10.1007/s00421-014-2827-8 · 2.30 Impact Factor
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