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Adrie van Diemen (MSc, MEd) Admotion - Webtrainer Visit website |
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" I think the Excalibur sport is a fantastic tool to assess athletes performance."
During the year we test our riders on the Excalibur to determine the different training intensities which elect the specific and desired training effects. With this top level ergometer we are sure we deliver the right power to the athletes. We have the version with the pedal force measurements and length adjustable cranks. With the continuously variable adjustable seat and handlebar position all our riders fit perfect on the ergometer. During the testing we measure the pedal forces to analyse the left and right balance and their cycling technique with the software that comes with the ergometer. This gives us the possibility tot advise the riders how to position the non circular chainring if they use it. Just perfect! |
PDFPublications
Relative degree of stimulation-evoked glycogen degradation in muscle fibres of different type in rat gastrocnemius. (Kernell D, Lind A, van Diemen AB, De Haan A.)
Date
2012-07-19 Title journal
Relative degree of stimulation-evoked glycogen degradation in muscle fibres of different type in rat gastrocnemius. Source
The Journal of physiology
1. The relative degree of glycogen degradation, caused in different fibre types by supramaximal electrical activation of the muscle nerve, was investigated in m. gastrocnemius medialis of young adult rats under general pentobarbitone anaesthesia. Four different protocols of intermittent maximal tetanic activation were used, each lasting 6 s (33% duty cycle; fast and slow isovelocity concentric (shortening) contractions, brief- and long-burst isometric contractions; 6 rats per group). All contractions were evoked under ischaemic conditions. 2. Work output finally dropped to 29% of the initial value for the fast concentric and to 87% for the slow concentric contractions. In isometric protocols evoked by the same stimulation patterns, the force x time area rose to 110% for brief-burst contractions and dropped to 95% for the long-burst contractions. 3. Following the physiological procedures, the experimental muscle and its contralateral control were removed and prepared for histochemical analysis. Serial sections were stained for glycogen (periodic acid-Schiff (PAS) method) and myofibrillar ATPase (mATPase), the latter reactions being used for classifying the fibres as types I, IIA, IIBd and IIBm. 4. For deep 'red' regions of non-stimulated contralateral control muscles the optical density of PAS staining was ranked between fibre types such that I < IIA < IIBd < IIBm. In superficial 'white' regions of the same muscles, no significant difference in PAS staining density was found between IIBd and IIBm fibres (types I and IIA not present). 5. All contractile protocols produced a significant glycogen degradation in IIBm fibres, and the fast concentric activation procedure was associated with a significant decline of PAS staining in all fibre types. For all activation protocols, the relative degree of glycogen degradation within a given region was ranked such that IIBm > IIBd > IIA > I. For IIBm vs. IIBd fibres, the differences in relative degradation were greater and more consistently significant for superficial white regions than in the deeper red muscle portions. 6. The results are discussed in relation to glycogen degradation measurements in studies of motor unit recruitment. Furthermore, the results from red vs. white muscle regions underline that fibres of seemingly the same mATPase type may differ considerably in other properties.
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The effects of replacing a portion of endurance training by explosive strength training on performance in trained cyclists. (Bastiaans JJ, van Diemen AB, Veneberg T, Jeukendrup AE.)
Date
2012-07-19 Title journal
The effects of replacing a portion of endurance training by explosive strength training on performance in trained cyclists. Source
European Journal of Applied Physiology
To investigate the effects of replacing a portion of endurance training by strength training on exercise performance, 14 competitive cyclists were divided into an experimental (E; n = 6) and a control (C; n = 8) group. Both groups received a training program of 9 weeks. The total training volume for both groups was the same [E: 8.8 (1.1) h/week; C: 8.9 (1.7) h/week], but 37% of training for E consisted of explosive-type strength training, whilst C received endurance training only. Simulated time trial performance (TT), short-term performance (STP), maximal workload (Wmax) and gross (GE) and delta efficiency (DE) were measured before, after 4 weeks and at the end of the training program (9 weeks). No significant group-by-training effects for the markers of endurance performance (TT and Wmax) were found after 9 weeks, although after 4 weeks, these markers had only increased (P < 0.05) in E. STP decreased (P < 0.05) in C, whereas no changes were observed in E. For DE, a significant group-by-training interaction (P < 0.05) was found, and for GE the group-by-training interaction was not significant. It is concluded that replacing a portion of endurance training by explosive strength training prevents a decrease in STP without compromising gains in endurance performance of trained cyclists.
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High Performance Cycling - Chapter 18. (Asker-Jeukendrup, Adrie van Diemen, Jabik Jan Bastiaans)
Date
2002-01-01 Title journal
High Performance Cycling - Chapter 18. Source
Human Kinetics
Strength and Flexibility.
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