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Critical velocity of continuous and intermittent running exercise (1996)

Vandewalle, H. ; Thomaïdis, M. ; Jousselin, E. ; [et al.]

Springer

European journal of applied physiology 73 (1996), S. 484-487

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ISSN: 1439-6327

Keywords: Endurance ; running ; testing

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract The relationship between exhaustion time (tlim) and distance Dlim for running exercises at constant velocity until exhaustion can be described by a linear relationship (Dlim = a + b tlim) whose slope corresponds to a critical velocity. Seven runners participated to the study which compared the critical velocity of continuous versus intermittent running exercises. The critical velocity for continuous running (Vcritc) was calculated from the results (tlimc and Dlimc) of running exercises performed at 95 and 105 % of the final velocity of the Montreal Track Test (vMTT). The intermittent running consisted of repetitions of running exercises performed at 95 and 105 % vMTT during a time equal to half the value of the corresponding tlimc, The subjects recovered during a time equal to running time while jogging at a slow pace. The critical velocity for intermittent running (Vcriti) was calculated from the cumulated running distance (Dlimi) and cumulated running time (tlimi) corresponding to 95 and 105 % vMTT. Vcriti was equal to Vcritc (4.56 ± 0.444 m.s−1 vs 4.60 ± 0.416 m.s−1). Nevertheless, in some subjects, the repetition numbers were very different for the intermittent running exercises at 95 and 105 % vMTT. This paradoxical result could be explained by the fact that the value of Vcrit should be theoretically little sensitive to a large error in the value of tlim corresponding to a velocity slightly higher than critical velocity, for intermittent exercises as well as continuous exercises.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00334428

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Cellulase production by trichoderma harzianum in static and mixed solid-state fermentation reactors under nonaseptic conditions (1985)

Deschamps, F. ; Giuliano, C. ; Asther, M. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Biotechnology and Bioengineering 27 (1985), S. 1385-1388

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ISSN: 0006-3592

Keywords: Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology

Notes: Cellulase production from lignocellulosic materials was studied in solid-state cultivation by both static and mixed techniques under nonaseptic conditions. The effects of fermentation conditions, such as moisture content, pH, temperature, and aeration, on cellulase production by Trichoderma harzianum using a mixture of wheat straw (80%) and bran (20%) were investigated. With a moisture content of 74% and a pH of 5.8., 18 IU filter paper activity and 198 IU endoglucanase activity/g initial substrate content were obtained in 66 h. The extension from static column cultivation to stirred tank reactor of 65 L capacity gave similar yields of cellulase.

Additional Material: 3 Ill.