Transmission and contraction fatigue of rat motor units in relation to succinate dehydrogenase activity of motor unit fibres
1. The fatigue in rat anterior tibial (a.t.) motor units was studied and related to microphotometric determinations of succinate dehydrogenase (SDH) activity of the motor unit muscle fibres. 2. Anterior tibial contains fast-twitch type II fibre units with an average contraction time of 11 msec and a...
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| Veröffentlicht in: | The Journal of physiology 1979-03, Vol.288 (1), p.285-300 |
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| creator | Kugelberg, E Lindegren, B |
| description | 1. The fatigue in rat anterior tibial (a.t.) motor units was studied and related to microphotometric determinations of succinate
dehydrogenase (SDH) activity of the motor unit muscle fibres. 2. Anterior tibial contains fast-twitch type II fibre units
with an average contraction time of 11 msec and about 5% slow-twitch type I fibre units with an average contraction time of
20 msec. 3. In type II fibres stained for SDH, absorbance varied continuously from 0.046 to 0.569 and inversely to fibre size,
except for the largest fibres. 4. Resistance to fatigue of fast motor units to 100 Hz intermittent stimulation varied continuously
within a wide range in near linear relations to absorbance for SDH of unit fibres and inversely to tetanic tension, except
for motor units with the largest fibres and the largest tetanic tension. 5. Neither resistance to fatigue nor SDH activity
lent itself to any categorization of motor units or fibres into well demarcated functional or histochemical types, since both
parameters varied continuously in the unit and fibre population of the muscle. 6. The direct relation between resistance to
fatigue of fast-twitch motor units and SDH activity of unit fibres appeared valid for fatigue resistance of: (a) neuromuscular
transmission, tested with 100 Hz intermittent stimulation which gave concomitant failure of electrical and mechanical response,
(b) excitation--contraction coupling, demonstrated by post-stimulatory depression of twitch tension with preserved maximum
tetanus tension and action potential, and (c) contractile mechanism; excitation--contraction coupling?, tested with low frequency
stimulation which gave decline of twitch and maximum tetanus tension with preserved action potential. 7. It is suggested that
the endurance of each link in the chain of events leading to contraction, including neuromuscular junction and the excitation--contraction
coupling system, is under aerobic conditions matched to the contractile capacity of the fibre expressed by its oxidative enzyme
activity. |
| doi_str_mv | 10.1113/jphysiol.1979.sp012695 |
| format | Article |
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dehydrogenase (SDH) activity of the motor unit muscle fibres. 2. Anterior tibial contains fast-twitch type II fibre units
with an average contraction time of 11 msec and about 5% slow-twitch type I fibre units with an average contraction time of
20 msec. 3. In type II fibres stained for SDH, absorbance varied continuously from 0.046 to 0.569 and inversely to fibre size,
except for the largest fibres. 4. Resistance to fatigue of fast motor units to 100 Hz intermittent stimulation varied continuously
within a wide range in near linear relations to absorbance for SDH of unit fibres and inversely to tetanic tension, except
for motor units with the largest fibres and the largest tetanic tension. 5. Neither resistance to fatigue nor SDH activity
lent itself to any categorization of motor units or fibres into well demarcated functional or histochemical types, since both
parameters varied continuously in the unit and fibre population of the muscle. 6. The direct relation between resistance to
fatigue of fast-twitch motor units and SDH activity of unit fibres appeared valid for fatigue resistance of: (a) neuromuscular
transmission, tested with 100 Hz intermittent stimulation which gave concomitant failure of electrical and mechanical response,
(b) excitation--contraction coupling, demonstrated by post-stimulatory depression of twitch tension with preserved maximum
tetanus tension and action potential, and (c) contractile mechanism; excitation--contraction coupling?, tested with low frequency
stimulation which gave decline of twitch and maximum tetanus tension with preserved action potential. 7. It is suggested that
the endurance of each link in the chain of events leading to contraction, including neuromuscular junction and the excitation--contraction
coupling system, is under aerobic conditions matched to the contractile capacity of the fibre expressed by its oxidative enzyme
activity.</description><identifier>ISSN: 0022-3751</identifier><identifier>EISSN: 1469-7793</identifier><identifier>DOI: 10.1113/jphysiol.1979.sp012695</identifier><identifier>PMID: 224167</identifier><language>eng</language><publisher>England: The Physiological Society</publisher><subject>Action Potentials ; Animals ; Male ; Motor Neurons - enzymology ; Motor Neurons - physiology ; Muscle Contraction ; Muscles - enzymology ; Muscles - innervation ; Rats ; Succinate Dehydrogenase - metabolism ; Synaptic Transmission</subject><ispartof>The Journal of physiology, 1979-03, Vol.288 (1), p.285-300</ispartof><rights>1979 The Physiological Society</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4845-c2b118e8f0acd2cbdf3f7988d325b0221daf0c0230213056ce1056ead6460a73</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC1281426/pdf/$$EPDF$$P50$$Gpubmedcentral$$H</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC1281426/$$EHTML$$P50$$Gpubmedcentral$$H</linktohtml><link.rule.ids>230,314,727,780,784,885,1417,27924,27925,45574,45575,53791,53793</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/224167$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Kugelberg, E</creatorcontrib><creatorcontrib>Lindegren, B</creatorcontrib><title>Transmission and contraction fatigue of rat motor units in relation to succinate dehydrogenase activity of motor unit fibres</title><title>The Journal of physiology</title><addtitle>J Physiol</addtitle><description>1. The fatigue in rat anterior tibial (a.t.) motor units was studied and related to microphotometric determinations of succinate
dehydrogenase (SDH) activity of the motor unit muscle fibres. 2. Anterior tibial contains fast-twitch type II fibre units
with an average contraction time of 11 msec and about 5% slow-twitch type I fibre units with an average contraction time of
20 msec. 3. In type II fibres stained for SDH, absorbance varied continuously from 0.046 to 0.569 and inversely to fibre size,
except for the largest fibres. 4. Resistance to fatigue of fast motor units to 100 Hz intermittent stimulation varied continuously
within a wide range in near linear relations to absorbance for SDH of unit fibres and inversely to tetanic tension, except
for motor units with the largest fibres and the largest tetanic tension. 5. Neither resistance to fatigue nor SDH activity
lent itself to any categorization of motor units or fibres into well demarcated functional or histochemical types, since both
parameters varied continuously in the unit and fibre population of the muscle. 6. The direct relation between resistance to
fatigue of fast-twitch motor units and SDH activity of unit fibres appeared valid for fatigue resistance of: (a) neuromuscular
transmission, tested with 100 Hz intermittent stimulation which gave concomitant failure of electrical and mechanical response,
(b) excitation--contraction coupling, demonstrated by post-stimulatory depression of twitch tension with preserved maximum
tetanus tension and action potential, and (c) contractile mechanism; excitation--contraction coupling?, tested with low frequency
stimulation which gave decline of twitch and maximum tetanus tension with preserved action potential. 7. It is suggested that
the endurance of each link in the chain of events leading to contraction, including neuromuscular junction and the excitation--contraction
coupling system, is under aerobic conditions matched to the contractile capacity of the fibre expressed by its oxidative enzyme
activity.</description><subject>Action Potentials</subject><subject>Animals</subject><subject>Male</subject><subject>Motor Neurons - enzymology</subject><subject>Motor Neurons - physiology</subject><subject>Muscle Contraction</subject><subject>Muscles - enzymology</subject><subject>Muscles - innervation</subject><subject>Rats</subject><subject>Succinate Dehydrogenase - metabolism</subject><subject>Synaptic Transmission</subject><issn>0022-3751</issn><issn>1469-7793</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1979</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkUtv3CAUha2qr2naf1BVrJpuPAWMMWwitVGfitQuZo8wvh4TeWAKOJGl_vjgOknbTdUNCO653-VwiuIVwVtCSPX28jjM0fpxS2Qjt_GICeWyflBsCOOybBpZPSw2GFNaVk1NnhbPYrzEmFRYyifFY0oZ4c2m-LkL2sWDjRnlkHYdMt6loE1azr1Odj8B8j0KOqGDTz6gydkUkXUowKh_yZJHcTLGOp0AdTDMXfB7cDoCWkBXNs0L4nc76m0bID4vHvV6jPDidj8pdh8_7M4_lxffPn05f3dRGiZYXRraEiJA9Fibjpq266u-kUJ0Fa3bbJB0uscG0wrTbK_mBkheQXeccayb6qQ4W7HHqT1AZ2AxOKpjsAcdZuW1VX9XnB3U3l8pQgVhlGfA61tA8D8miEnlDzMwjtqBn6JqGBdYMpqFb_4pJFwyySWtWJbyVWqCjzFAf_8egtUSsLoLWC0Bq7uAc-PLP93ct62J5vL7tXxtR5j_E6p2X78vF1SI7HmZcbpCBrsfrm0AtbZFbyykPEsIRdSivAE4m8uX</recordid><startdate>19790301</startdate><enddate>19790301</enddate><creator>Kugelberg, E</creator><creator>Lindegren, B</creator><general>The Physiological Society</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TK</scope><scope>7X8</scope><scope>5PM</scope></search><sort><creationdate>19790301</creationdate><title>Transmission and contraction fatigue of rat motor units in relation to succinate dehydrogenase activity of motor unit fibres</title><author>Kugelberg, E ; Lindegren, B</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4845-c2b118e8f0acd2cbdf3f7988d325b0221daf0c0230213056ce1056ead6460a73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1979</creationdate><topic>Action Potentials</topic><topic>Animals</topic><topic>Male</topic><topic>Motor Neurons - enzymology</topic><topic>Motor Neurons - physiology</topic><topic>Muscle Contraction</topic><topic>Muscles - enzymology</topic><topic>Muscles - innervation</topic><topic>Rats</topic><topic>Succinate Dehydrogenase - metabolism</topic><topic>Synaptic Transmission</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kugelberg, E</creatorcontrib><creatorcontrib>Lindegren, B</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Neurosciences Abstracts</collection><collection>MEDLINE - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>The Journal of physiology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kugelberg, E</au><au>Lindegren, B</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Transmission and contraction fatigue of rat motor units in relation to succinate dehydrogenase activity of motor unit fibres</atitle><jtitle>The Journal of physiology</jtitle><addtitle>J Physiol</addtitle><date>1979-03-01</date><risdate>1979</risdate><volume>288</volume><issue>1</issue><spage>285</spage><epage>300</epage><pages>285-300</pages><issn>0022-3751</issn><eissn>1469-7793</eissn><abstract>1. The fatigue in rat anterior tibial (a.t.) motor units was studied and related to microphotometric determinations of succinate
dehydrogenase (SDH) activity of the motor unit muscle fibres. 2. Anterior tibial contains fast-twitch type II fibre units
with an average contraction time of 11 msec and about 5% slow-twitch type I fibre units with an average contraction time of
20 msec. 3. In type II fibres stained for SDH, absorbance varied continuously from 0.046 to 0.569 and inversely to fibre size,
except for the largest fibres. 4. Resistance to fatigue of fast motor units to 100 Hz intermittent stimulation varied continuously
within a wide range in near linear relations to absorbance for SDH of unit fibres and inversely to tetanic tension, except
for motor units with the largest fibres and the largest tetanic tension. 5. Neither resistance to fatigue nor SDH activity
lent itself to any categorization of motor units or fibres into well demarcated functional or histochemical types, since both
parameters varied continuously in the unit and fibre population of the muscle. 6. The direct relation between resistance to
fatigue of fast-twitch motor units and SDH activity of unit fibres appeared valid for fatigue resistance of: (a) neuromuscular
transmission, tested with 100 Hz intermittent stimulation which gave concomitant failure of electrical and mechanical response,
(b) excitation--contraction coupling, demonstrated by post-stimulatory depression of twitch tension with preserved maximum
tetanus tension and action potential, and (c) contractile mechanism; excitation--contraction coupling?, tested with low frequency
stimulation which gave decline of twitch and maximum tetanus tension with preserved action potential. 7. It is suggested that
the endurance of each link in the chain of events leading to contraction, including neuromuscular junction and the excitation--contraction
coupling system, is under aerobic conditions matched to the contractile capacity of the fibre expressed by its oxidative enzyme
activity.</abstract><cop>England</cop><pub>The Physiological Society</pub><pmid>224167</pmid><doi>10.1113/jphysiol.1979.sp012695</doi><tpages>16</tpages></addata></record> |
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| source | MEDLINE; Wiley Online Library; PubMed Central; Alma/SFX Local Collection; EZB Electronic Journals Library |
| subjects | Action Potentials Animals Male Motor Neurons - enzymology Motor Neurons - physiology Muscle Contraction Muscles - enzymology Muscles - innervation Rats Succinate Dehydrogenase - metabolism Synaptic Transmission |
| title | Transmission and contraction fatigue of rat motor units in relation to succinate dehydrogenase activity of motor unit fibres |
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