scholarly journals Twitch interpolation: superimposed twitches decline progressively during a tetanic contraction of human adductor pollicis

2013 ◽  
Vol 591 (5) ◽  
pp. 1373-1383 ◽  
Author(s):  
S. C. Gandevia ◽  
C. J. McNeil ◽  
T. J. Carroll ◽  
J. L. Taylor
Keyword(s):  
Adductor Pollicis ◽  
Tetanic Contraction ◽  
Twitch Interpolation

Tetanic force development of adductor pollicis muscle in anesthetized man

1975 ◽  
Vol 39 (5) ◽  
pp. 714-717 ◽  
Author(s):  
N. Sugai ◽  
R. Worsley ◽  
J. P. Payne
Keyword(s):  
Adductor Pollicis ◽  
Tetanic Contraction ◽  
Tetanic Force ◽  
Adductor Pollicis Muscle ◽  
Mean Frequency ◽  
Force Development ◽  
Maximal Force ◽  
Nitrous Oxide Oxygen ◽  
The Mean ◽  
Stimulation Of

The tetanic force development of the human adductor pollicis muscle was studied under light anesthesia with nitrous oxide, oxygen, and Demerol, by the use of tetanic stimulation of the ulnar nerve at frequencies ranging from 10 to 100 Hz. The time necessary for the tetanic contraction to reach a plateau was longest at frequencies between 15 and 20 Hz. Fusion of tetanus occurred between 40 and 45 Hz. The mean maximal force of 6.92 kg was developed at a mean frequency of approximately 75 Hz. The maximal force was well maintained up to a stimulation frequency of 100 Hz. The results indicate that in lightly anesthetized man, the maximal force is developed at higher stimulation frequencies than those observed in conscious man and that it is well sustained at higher frequencies.

What Is Fatigue?

2002 ◽  
Vol 27 (1) ◽  
pp. 42-55 ◽  
Author(s):  
Brian R. Macintosh ◽  
Dilson E. Rassier
Keyword(s):  
Contractile Response ◽  
Initial Response ◽  
Calcium Sensitivity ◽  
General Definition ◽  
Light Chains ◽  
Posttetanic Potentiation ◽  
Tetanic Contraction ◽  
First Response ◽  
Definition Of ◽  
Regulatory Light Chain Phosphorylation

Fatigue and potentiation are two forms of force modulation. A general definition of fatigue is "a circumstance where less than the anticipated contractile response is obtained." Fatigue is associated with depressed Ca2+ release and possibly decreased Ca2+ sensitivity. Potentiation results from increased Ca2+ sensitivity due to regulatory light chain phosphorylation. Muscle fatigue and potentiation can coexist, making it difficult to quantify these processes. With repetitive 10 Hz stimulation, the developed tension first increases, then decreases. Is fatigue present when developed tension first begins to decrease or when it falls below the developed tension of the first response? Intermittent incompletely fused tetanic contractions for which peak developed tension first decreases, then increases, is another unusual example of fatigue. A third example is when twitch contractions following a tetanic contraction decrease to a level below the pretetanic twitch amplitude, indicating that fatigue may have been coexistent with posttetanic potentiation. These observations illustrate the complexity of detecting fatigue, based on the simple, but commonly accepted definition presented above. Care must be taken in interpreting "before vs. after" contractile responses. Even when the contraction amplitude is greater than the initial response, there is no guarantee that mechanisms associated with fatigue are not present. Key words: calcium sensitivity, staircase, posttetanic potentiation, myosin light chains, skeletal muscle

Slower fatigue and faster recovery of the adductor pollicis muscle in women matched for strength with men

1999 ◽  
Vol 167 (3) ◽  
pp. 233-239 ◽  
Author(s):  
Fulco ◽  
Rock ◽  
Muza ◽  
Lammi ◽  
Cymerman ◽  
...  
Keyword(s):  
Adductor Pollicis ◽  
Adductor Pollicis Muscle

scholarly journals ADDUCTOR POLLICIS MUSCLE THICKNESS AND PREDICTION OF POSTOPERATIVE MORTALITY IN PATIENTS WITH STOMACH CANCER

2018 ◽  
Vol 31 (1) ◽  
Author(s):  
Aline Kirjner POZIOMYCK ◽  
Oly Campos CORLETA ◽  
Leandro Totti CAVAZZOLA ◽  
Antonio Carlos WESTON ◽  
Edson Braga LAMEU ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Stomach Cancer ◽  
Nutritional Assessment ◽  
Postoperative Mortality ◽  
Muscle Thickness ◽  
Adductor Pollicis ◽  
Dominant Hand ◽  
Adductor Pollicis Muscle ◽  
Risk Of Death ◽  
Muscle Compartment

ABSTRACT Background: Malnutrition is very prevalent in patients with gastric cancer and increases the risk of morbidity and mortality. Adductor pollicis muscle thickness (APMT) appears as an important objective, quick, inexpensive and noninvasive measure to assess the muscle compartment Aim: To compare APMT and other nutritional assessment methods and to correlate these methods with postoperative mortality Methods: Forty-four patients, 29 men and 15 women, mean age of 63±10.2 and ranging from 34-83 years, who underwent nine (20.5%) partial and 34 (77.3%) total gastrectomies due to stomach cancer (stage II to IIIa) were preoperatively assessed by Patient Generated Subjective Global Assessment (PG-SGA), anthropometry and laboratorial profile Results: APMT better predicted death (p<0.001) on both, dominant and non-dominant hand, and well correlated with albumin (p=0.039) and PG-SGA (p=0.007) Conclusion: APMT clearly allowed to determine malnutrition and to predict risk of death in patients with gastric cancer.

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