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:
(Date:3/20/2015)... , March 20, 2015 NXT-ID, Inc. (NASDAQ: ... authentication company focused on the growing mobile commerce market, ... is one of the products featured in 2015 "I ... at 11:00 PM EST on the DIY Network.   ... Las Vegas , site of the 2015 ...
(Date:3/17/2015)... 17, 2015 Emotient, the leader in ... announced general availability of Emotient Analytics , ... analysis of facial expressions. The system analyzes videos ... products and services. It delivers audience response metrics ... - as derived from facial evidence of emotional ...
(Date:3/12/2015)... BERLIN , March 12, 2015 ... IAM, a standardized identity and access management (IAM) ... reliable implementation schedule. With Beta System,s new IAM ... and best practices gleaned from multiple IAM implementations ... includes the software as well as any necessary ...
Breaking Biology News(10 mins):NXT-ID's Wocket Biometric Smart Wallet to Air on "I Want That" International CES Special 2NXT-ID's Wocket Biometric Smart Wallet to Air on "I Want That" International CES Special 3New Emotient Web Service Measures Audience Response Using On-Demand Facial Expression Analysis 2New Emotient Web Service Measures Audience Response Using On-Demand Facial Expression Analysis 3New Emotient Web Service Measures Audience Response Using On-Demand Facial Expression Analysis 4Beta Systems Fast Forward IAM Available Now: a Standardized IAM Package at a Fixed Price 2
(Date:3/26/2015)... 2015 PAREXEL International Corporation (Nasdaq: ... research organization , announced today that the ... acquire all of the business assets of privately-owned ... of specialized pharmacovigilance services, based in Chandigarh, ... assessment, monitoring, and prevention of adverse effects ...
(Date:3/26/2015)... March 26, 2015 Ale Gicqueau, Founder ... Director of Clinical Affairs at Align Technology, on “ ... the upcoming ACRP 2015 Global Conference and Exhibition on ... Utah. , During the poster presentation, Ale Gicqueau ... and running a Postmarket Registry, the requirements and resources ...
(Date:3/25/2015)... March 26, 2015 Agnition announced today ... of American Farmer, airing for the first time at ... of American Farmer will explore the extremely important role ... producers with a patented Microbial Catalyst™ technology that enhances ... yields. The segment will air again on April 28. ...
(Date:3/25/2015)... UK (PRWEB) March 25, 2015 ... uptake of smartphones have fuelled social media growth, ... being currently engaged in social networking. Insurance companies ... to communicate with clients and promote a diversity ... globe over are increasingly exploiting social networking services ...
Breaking Biology Technology:PAREXEL Announces Execution of Definitive Agreement to Acquire Quantum Solutions India, Strengthening Leadership In Pharmacovigilance Services 2PAREXEL Announces Execution of Definitive Agreement to Acquire Quantum Solutions India, Strengthening Leadership In Pharmacovigilance Services 3PAREXEL Announces Execution of Definitive Agreement to Acquire Quantum Solutions India, Strengthening Leadership In Pharmacovigilance Services 4Clinovo Presents at ACRP 2015 in Salt Lake City, Utah on April 25th-28th 2Clinovo Presents at ACRP 2015 in Salt Lake City, Utah on April 25th-28th 3Agnition to be Featured In Upcoming Episode of American Farmer on RFD-TV 2Social Media Role in Global Insurance Industry Examined by Timetric in New Market Research Report Published at MarketPublishers.com 2Social Media Role in Global Insurance Industry Examined by Timetric in New Market Research Report Published at MarketPublishers.com 3
Cached News: