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• W2005950003 abstract "PURPOSE: The mechanisms leading to exhaustion during severe exercise are unclear, but dynamical systems theory provides unique tools with which to address this question. Unfortunately, current estimators of Kolmogorov-Sinai entropy require the assumption of stationarity. We (Bollt et al., 2007) have recently developed a novel approach to regularity assessment termed Control Entropy (CE), which attenuates the requirement for stationarity, and makes it well suited to use for non-steady state conditions during exercise in the severe domain. Therefore, the purpose of this study was to test the hypothesis that CE would decline during intermittent and continuous exercise METHODS: Procedures were approved by the EMU -HSRC. Seven trained female cyclists and triathletes (36 ± 8 yr, 65 ± 10 kg, VO2peak = 44.9 ± 5.6 ml·kg−1·min.−1 and power at VO2peak (pVO2peak) 241.4 ± 29.8 W), performed three randomly assigned interval bouts 1) continuous (CON) at 100% pVO2peak, 2) high intensity intermittent (HI) alternating 30 s each at 100% and 70% pVO2peak, and 3) moderate intensity intermittent (MI) alternating 30 s each at 100% and 50% pVO2peak until exhaustion or halted at 30 min. Exercise was performed on the participant's own bicycle mounted to a Pro Lab Model ergometer (Computrainer TM, WA). Power data was converted using WKO+ (Peakware, CO) and ANOVA was performed using SPSS 14.0 (α=0.05). CE was calculated using 2 and 8 bit partitions, and window lengths of 51 to 6401 according to the following equation: CEKS[x(t)] =hKS[sign(dx/dt(t))] (Matlab; Mathworks, MA). RESULTS: Relatively, CON, HI and MI were performed at 98.8 +6.5, 85.0+15.9 and 75.1+24.4 % pVO2peak, respectively, and were not different between subjects. Tlim of HI (15:38+4:53) and MI (19:32+2:47) were significantly greater than CON (4:19+1:37) (p<.05). Window lengths of 201 and 401 and partitions of 2 or 8 symbols, resulted in lower CE in all trials at the end of the interval relative to the start (p<.05). Further, CE declined (p<.05) during VO2peak determination, indicating an inverse relationship between CE and intensely. CONCLUSION: CE declines during intense exercise under non steady state, highly variable conditions. The use of CE analysis of cycling power may provide unique insight into the nature of exhaustion during heavy and/or severe efforts." @default.
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• W2005950003 date "2008-05-01" @default.
• W2005950003 modified "2023-09-24" @default.
• W2005950003 title "Control Entropy of Power Output Declines During Variable Exercise in the Severe Domain" @default.
• W2005950003 doi "https://doi.org/10.1249/01.mss.0000321630.79521.99" @default.
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