ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Constant external work cycle exercise – the performance and metabolic effects of all-out and even-paced strategies (1996)

Cherry, P. W. ; Lakomy, H. K. A. ; Nevill, M. E. ; [et al.]

Springer

European journal of applied physiology 75 (1996), S. 22-27

add to mindlist on the mindlist

Details

ISSN: 1439-6327

Keywords: Key words Constant work ; Muscle action speed ; Power-velocity relationship ; Pacing strategies

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract The purpose of the present study was to establish whether the performance of an all-out sprint could be replicated and the metabolic responses moderated in two further trials involving pre-set constant average pedalling rates. A total of 24 subjects (12 males and 12 females) completed a 30-s high-speed maximal all-out effort on a cycle ergometer against an applied resistance equal to 7.5% of their body mass. On two further occasions the applied resistance was increased so that the external work of the all-out effort could be replicated by adopting a pre-determined constant average pedal rate. When the required pedal rate was within the range of 60–90 rev · min−1 the subjects were able to maintain the rate for the full 30-s and so could replicate the external work of the all-out effort. They were unable to sustain a faster constant rate within the range of 97–150 rev · min−1 for the full 30 s, resulting in ≈7% less external work being achieved (P 〈 0.05). A lower level of fatigue, reflected by less of a reduction in peak power output in a subsequent 6-s sprint (P 〈 0.05), arose as a result of similar work produced under constant paced conditions compared with the all-out effort. Also, post-exercise blood lactate, pH and ammonia were less disturbed (P 〈 0.05) following the paced trial compared with similar work produced in the all-out effort. A possible explanation for these findings is that there may be a partial sparing of some type II fibres as a consequence of an initial submaximal intensity of exercise during the paced trial.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s004210050121

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

The effect of crystallinity on chain mobility and free volume in the amorphous regions of a miscible polycarbonate/polyester blend (1994)

Zipper, M. D. ; Simon, G. P. ; Cherry, P. ; [et al.]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 1237-1247

add to mindlist on the mindlist

Details

ISSN: 0887-6266

Keywords: Polycarbonate ; ThermX ; semicrystalline polyester ; positron lifetimes ; miscible blends ; free volume ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: Homopolymers and blends of polycarbonate/ThermX have been investigated by differential scanning calorimetry, dynamic mechanical analysis, density measurements, and positron annihilation lifetime spectroscopy. The study focuses on the chain mobility and free volume in the amorphous miscible regions of the blends and how this mobility and free volume are affected by increasing crystallinity. It is proposed that judicious annealing, which results in increasing crystallinity (while avoiding ageing or transesterification), induces a constraint on the amorphous region leading to an increase in Tg and coalescence of free volume sites. © 1994 John Wiley & Sons, Inc.

Additional Material: 7 Ill.