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Keywords: fatigue
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Journal Articles
J Exp Biol (2022) 225 (10): jeb243813.
Published: 31 May 2022
... mollusks respond to chronic mechanical stress. Once a week for 7 months, we compressed whole live California mussels ( Mytilus californianus ) for 15 cycles at ∼55% of their predicted one-time breaking force, a treatment known to cause fatigue damage in shells. We found mussels repaired their shells...
Includes: Supplementary data
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
... shells have good resistance to single impacts but perform poorly under multiple impacts owing to their layered structure; impact damage is often fatal but can be repaired. Limpet Patella vulgata Fatigue Damage Spalling Delamination During the impact tests (including also the impact...
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. Hypothyroidism reduced both...
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...
Journal Articles
J Exp Biol (1990) 152 (1): 265–279.
Published: 1 September 1990
... −1 ) tensions, and also fatigued less than muscles with limited blood supply but no stimulation. Histochemical estimation of capillary density (by staining for alkaline phosphatase) and slow (SO) and fast (FOG) fibres (by myosin ATPase staining) revealed similar capillary to fibre ratios (2.5...
Journal Articles
J Exp Biol (1988) 139 (1): 51–65.
Published: 1 September 1988
... suited to optimize the release process at the terminal by utilizing a frequency-facilitation mechanism and by minimizing a mechanism of fatigue in the release process. The different properties of oxytocin and vasopressin neurones are of important physiological significance. The secretory terminals...
Journal Articles
J Exp Biol (1985) 115 (1): 307–318.
Published: 1 March 1985
... metabolic and contractile processes. During fatigue caused by intense contraction conditions, ATP content decreases (by approx. 50 %) and there is a stoichiometric production of IMP and ammonia in fast-twitch muscle. This loss in adenine nucleotide content is dependent on the severity of the contraction...