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Keywords: Fatigue
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Journal Articles
J Exp Biol (2022) 225 (9): jeb243285.
Published: 11 May 2022
...Sharn P. Shelley; Rob S. James; Steven J. Eustace; Emma Eyre; Jason Tallis ABSTRACT This study examined the effect of stimulation frequency (140, 200, 230 and 260 Hz) on isometric force, work loop (WL) power and the fatigue resistance of extensor digitorum longus (EDL) muscle ( n =32), isolated...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (24): 3927–3935.
Published: 15 December 2016
... with repeated impacts also failed by formation of an apex hole in almost all cases. Fig. 5 A shows the results of the fatigue tests carried out on in situ and beach specimens. The number of impacts to failure N f is plotted as a function of the applied energy. The normalised energy E n as defined...
Journal Articles
J Exp Biol (2016) 219 (18): 2806–2808.
Published: 15 September 2016
... with thapsigargin reduced muscle fatigue resistance, but hypothyroidism had no effect on fatigue. Hence, thyroid hormone plays a role in determining isolated skeletal muscle mechanics, but its effects are more likely to be mediated by mechanisms other than affecting SERCA activity. Calcium Fatigue Force...
Includes: Supplementary data
Journal Articles
J Exp Biol (2013) 216 (23): 4388–4394.
Published: 1 December 2013
...Glen A. Lichtwark; Andrew G. Cresswell; Richard J. Newsham-West SUMMARY The elastic properties of the human Achilles tendon are important for locomotion; however, in vitro tests suggest that repeated cyclic contractions lead to tendon fatigue – an increase in length in response to stress applied...
Journal Articles
J Exp Biol (2013) 216 (14): 2587–2594.
Published: 15 July 2013
..., suggesting one potential mechanism for maintenance of acute muscle performance. Soleus muscle fatigue resistance was significantly lower in torpid than in summer animals. Gastrocnemius muscle glycogen content was unchanged. However, state 3 and state 4 mitochondrial respiration rates were significantly...
Journal Articles
J Exp Biol (2011) 214 (9): 1571–1585.
Published: 1 May 2011
... perennially underestimated rates of macroalgal breakage. Recent laboratory testing has established that some seaweeds fail by fatigue, accumulating damage over a series of force impositions. Failure by fatigue may thus account, in part, for the discrepancy between prior breakage predictions, based...
Journal Articles
J Exp Biol (2010) 213 (8): 1259–1265.
Published: 15 April 2010
... [not significant (n.s.)]. Despite the lack of changes in stiffness, maximum tendon force during MVC was reduced from 3.5±0.6 kN to 2.8±0.7 kN ( P <0.01). As the proposed decline in stiffness was not observed, it is concluded that mechanical fatigue did not take place in the AT of healthy individuals after...
Journal Articles
J Exp Biol (2009) 212 (7): 961–976.
Published: 1 April 2009
...Katharine J. Mach SUMMARY On rocky shores, wave-swept macroalgae experience dramatic and repeated wave-induced hydrodynamic forces. However, previous studies of macroalgal mechanics have shown that individual waves are not forceful enough to account for observed rates of breakage. Instead, fatigue...
Journal Articles
J Exp Biol (2007) 210 (13): 2213–2230.
Published: 1 July 2007
... an alga. In contrast, intertidal macroalgae may experience more than 8000 waves a day. This repeated loading can cause cracks– introduced, for example, by herbivory or abrasion – to grow and eventually cause breakage, yet fatigue crack growth has not previously been taken into account. Here, we present...
Journal Articles
J Exp Biol (2007) 210 (13): 2231–2243.
Published: 1 July 2007
... impositions of maximal field forces. Nonetheless, macroalgae break frequently. Here we investigate the possibility that repeated loading by sub-lethal forces can eventually cause fracture by fatigue. We determine fracture toughness, in the form of critical strain energy release rate, for several flat-bladed...
Journal Articles
J Exp Biol (2007) 210 (4): 715–721.
Published: 15 February 2007
... times, absolute force, relative force (stress)and fatigue between male and female frogs. We found that ECR muscle mass and length were greater (tenfold and 1.4-fold, respectively), absolute tetanic muscle force and relative tetanic force (stress) were greater (16-fold and 2.2-fold, respectively...
Journal Articles
J Exp Biol (2005) 208 (9): 1653–1664.
Published: 1 May 2005
... fish; running animals; piston engines; electric motors; jets) comprises motors that cycle rapidly, with significant internal and external accelerations, and for whom inertia and fatigue life appear to be important constraints. The scaling of inertial loads and fatigue life both appear to enforce F max...