HOME >> BIOLOGY >> NEWS
For the longest distance runner, that tired feeling may not be due to central fatigue

iology.

Methodology

Nine healthy male subjects (age 41.6 5.9 years; mass 152 15 lbs.; height 5 ft., 9 inches four inches; body fat 10.6 2.6 percent), all regular competitors in running or triathlon events, were enrolled in the study. The maximal twitches for knee extensors (KE) and plantar flexors (PF) were both examined before and after the 40-mile race using a bicycle ergometer. This testing device uses the inertia of a flywheel to provide resistance during both shortening (concentric) and lengthening (eccentric) muscle actions. This measures isometric, concentric, and eccentric muscle actions, assessing strength and velocity of different types of muscle actions.

The first session, when subjects were in a nonfatigued state, was conducted in the week prior to the ultramarathon. The test started with a 10 minute warm-up on the bicycle ergometer. The second session was undertaken in a fatigued state, two minutes after the race, and required 20 minutes on the bicycle ergometer.

During both sessions, the KE and PF were given electrical stimulation to determine muscle contractile measurements. During the test in the nonfatigued stage, the intensity was increased until there was no further increase in the height of the muscle twitch (involuntary contraction) or the amplitude of the M wave (electrically evoked muscle potential). The same stimulus level was used during the fatigued stage of the experiment.

Results

Maximal voluntary contractions and maximal voluntary activation decreased significantly after the ultramarathon (a decline of 30.2 18.0 percent and 27.7 13.0 percent, respectively). Surprisingly, peak twitch increased after the ultramarathon from 15.8 6.3 to 19.7 3.3 Nm) and from 131.9 21.2 to 157.1 35.9 Nm for KE. Also, shorter contraction and half-relaxation times were observed for both muscles. The compound muscle action potentials (M wave) were not significa
'"/>

Contact: Donna Krupa
djkrupa1@aol.com
703-527-7357
American Physiological Society
14-Mar-2002


Page: 1 2 3

Related biology news :

1. ICSI and IVF are safe results from worlds largest, longest running study
2. Yellowstones long-distance travelers in trouble, study says
3. Long-distance command sends human growth hormone into action
4. Action at a distance in the hyperoxic eye
5. Misfiring proteins tied to inflammation and sick feeling of type 2 diabetics
6. Scientists sequence genome of kind of organism central to biospheres carbon cycle
7. Genes may be central to cocaine addiction
8. Newborn lambs central heating system could aid fat busting in humans
9. Visualizing the central dogma
10. A link between thimerosal and the brain: Can vaccines affect central nervous system function?
11. Virginia Bioinformatics Institute central to Regional Center of Excellence

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/23/2016)... 2016 Einzigartige ... und Stimmerkennung mit Passwörtern     ... MESG ), ein führender Anbieter digitaler Kommunikationsdienste, ... SpeechPro zusammenarbeitet, um erstmals dessen Biometrietechnologie einzusetzen. ... Möglichkeit angeboten, im Rahmen mobiler Apps neben ...
(Date:3/22/2016)... , PROVO and ... Newborn Screening Ontario (NSO), which operates the highest sample ... molecular testing, and Tute Genomics and UNIConnect, leaders in ... respectively, today announced the launch of a project to ... (NGS) testing panel. NSO has been ...
(Date:3/18/2016)... , March 18, 2016 ... Suppliers of Biometrics, ICT, Manned & Unmanned Vehicles, Physical infrastructure ... & security companies in the border security market and the ... and Europe has led visiongain ... companies improved success. --> defence & security ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... June 23, 2016 ... 2016;12(1):22-8 http://doi.org/10.17925/OHR.2016.12.01.22 Published recently ... peer-reviewed journal from touchONCOLOGY, Andrew D Zelenetz ... of cancer care is placing an increasing burden ... expensive biologic therapies. With the patents on many ...
(Date:6/23/2016)... San Francisco, CA (PRWEB) , ... June 23, ... ... capture (EDC) software, is exhibiting at the Pennsylvania Convention Center and will showcase ... DIA Annual conference. ClinCapture will also be presenting a scientific poster on Disrupting ...
(Date:6/23/2016)... ... 23, 2016 , ... Velocity Products, a division of Morris ... optimized exclusively for Okuma CNC machining centers at The International Manufacturing Technology Show, ... several companies with expertise in toolholding, cutting tools, machining dynamics and distribution, Velocity ...
(Date:6/23/2016)... 23, 2016 ReportsnReports.com adds ... to its pharmaceuticals section with historic and forecast ... much more. Complete report on the ... profiling 15 companies and supported with 261 tables ... . The Global Cell Culture ...
Breaking Biology Technology:
Cached News: