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Energy production of rat extensor digitorum longus muscle.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wendt, Igor Gibbs, Colin L. |
| Copyright Year | 1973 |
| Abstract | WENDT, I. R., AND C. L. GIBBS. Energy production of rat extensor digitorum longus muscle. Am. J. Physiol. 224(5) : 1081-1086 1973.The myothermic technique was employed to investigate the energy production of the fast-twitch extensor digitorum longus (EDL) muscle of the rat. Both isotonic and isometric tetani were studied. The total energy liberated during an isotonic tetanus was found to be maximal with loads approximately 0.6 PO (where P, is the peak isometric tension) and was always minimal for the lightest loads. The mechanical efficiency of these muscles appeared to be quite low (maximally 7.3-14.2y0 with the stimulus parameters employed). In isometric experiments, the maintenance heat rate varied with muscle length. At 1, length, the heat rate was 32.6 meal/g muscle per second, and it fell with tension when the muscles were either stretched or shortened. In stretched muscles the tension-independent heat rate was 11.3 meal/g muscle per second and the activation heat, in response to a single stimulus, was estimated to be 0.57 meal/g muscle over both the initial and recovery phases. These values are considerably higher than comparable values reported for the slow-twitch soleus muscle, and it is suggested that the greater energy expenditure of the fast-twitch EDL muscle reflects higher myosin ATPase activity and a more extensive and active sarcoplasmic reticulum. It is concluded that the fasttwitch EDL muscle sacrifices energetic economy in return for speed of response. |
| File Format | PDF HTM / HTML |
| DOI | 10.1152/ajplegacy.1973.224.5.1081 |
| Alternate Webpage(s) | http://ajplegacy.physiology.org/content/224/5/1081?ijkey=4c4e4ea18264788be229d09deb636924241306e9&keytype2=tf_ipsecsha |
| Alternate Webpage(s) | http://ajplegacy.physiology.org/content/224/5/1081?ijkey=8d3d00c73f29528ed6c4c8144edaee3d8e734953&keytype2=tf_ipsecsha |
| Alternate Webpage(s) | http://ajplegacy.physiology.org/content/224/5/1081?ijkey=41c07b4d94f705f4a2f8cfd99649da71bf93329f&keytype2=tf_ipsecsha |
| PubMed reference number | 4700625 |
| Alternate Webpage(s) | https://doi.org/10.1152/ajplegacy.1973.224.5.1081 |
| Journal | Medline |
| Volume Number | 224 |
| Issue Number | 5 |
| Journal | The American journal of physiology |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
