Elevated serum enzyme activity: an explanation-based model

Morton, R. Hugh; Carter, M. R.

doi:10.1152/jappl.1992.73.5.2192

Cited by 4 publications

(4 citation statements)

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“…It is also possible that, if only a small percentage of the muscle fibres were damaged (for example, fast fibres), undamaged fibres could counterbalance the limited capacity of force production of the formers (Dedrick and Clarkson 1990). In fact, it has been suggested that a group of more fragile, stress susceptible fibres exists; these fibres would be reduced in number after a first bout of exercise, while the stronger fibres would survive (Morton and Carter 1992).…”

Section: Recovery Of Mechanical Neurophysiological and Blood Parametersmentioning

confidence: 99%

Neuromuscular recovery after a strength training session in elderly people

et al. 2006

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Ageing is associated with an increased susceptibility to muscle damage but little is known on how this affects muscle recovery after exercise. Hence, this study is aiming at investigating the effects of a heavy-resistance training session of neuromuscular recovery of the calf muscles of a group of elderly men aged >65. Maximal isometric and isokinetic torque, muscle voluntary activation (VA) capacity, surface electromyographic activity (EMG), peak-to-peak amplitude of action potentials associated with twitch responses of plantar flexors were evaluated before and 5 min (post1), 24 h (post2) and 48 h (post3) after 10 sets of 10 repetitions of a calf raise exercise performed at an intensity of 70% of the individual, one repetition maximum. Blood samples were taken before and 1, 48, 96 and 144 h after the training session and assayed for serum creatine kinase (CK), lactate dehydrogenase (LDH) and myoglobin (Mb). Peak torque during eccentric and concentric (120 degrees s-1) contractions and twitch parameters were significantly reduced at post1, and recovered completely at post2. No significant changes were found in integrated EMG, M-wave amplitudes and VA throughout the entire test period. CK and LDH concentrations reached peak values 48 h after the exercise session and returned to the pre-exercise values 96 h after the training session. Serum Mb level increased by 73.2% 1 h after exercise and recovered at 48 h. The reduction in peak torque following a strength training session in an elderly population could be explained mainly by fatigue of peripheral origin. After 24 h the elders recovered completely their capacities of strength production, despite muscle damage being still evident 48 h after the strength training session.

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Section: Recovery Of Mechanical Neurophysiological and Blood Parametersmentioning

confidence: 99%

Neuromuscular recovery after a strength training session in elderly people

et al. 2006

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“…We investigated flight-induced muscle damage during migration by measuring plasma creatine kinase (CK) activity in two species of long-distance migrant shorebirds with very different migration strategies. Plasma CK activity is one of the most widely used indicators of exercise-induced skeletal muscle damage (Clarkson et al, 1992;Morton and Carter, 1992;Komulainen et al, 1995;Sorichter et al, 1997;Clarkson and Sayers, 1999), and its suitability for use in birds is based on a number of studies (Franson et al, 1985;Bollinger et al, 1989;Dabbert and Powell, 1993;George and John, 1993;Knuth and Chaplin, 1994;Totzke et al, 1999).…”

Section: A Sport-physiological Perspective On Bird Migration: Evidence For Flight-induced Muscle Damagementioning

confidence: 99%

A sport-physiological perspective on bird migration: evidence for flight-induced muscle damage

Guglielmo

Piersma

Williams

2001

Journal of Experimental Biology

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SUMMARY Exercise-induced muscle damage is a well-described consequence of strenuous exercise, but its potential importance in the evolution of animal activity patterns is unknown. We used plasma creatine kinase (CK) activity as an indicator of muscle damage to investigate whether the high intensity, long-duration flights of two migratory shorebird species cause muscle damage that must be repaired during stopover. In two years of study, plasma CK activity was significantly higher in migrating western sandpipers (a non-synchronous, short-hop migrant), than in non-migrants. Similarly, in the bar-tailed godwit (a synchronous, long-jump migrant), plasma CK activity was highest immediately after arrival from a 4000–5000km flight from West Africa to The Netherlands, and declined before departure for the arctic breeding areas. Late-arriving godwits had higher plasma CK activity than birds that had been at the stopover site longer. Juvenile western sandpipers making their first southward migration had higher plasma CK activity than adults. These results indicate that muscle damage occurs during migration, and that it is exacerbated in young, relatively untrained birds. However, the magnitude of the increases in plasma CK activity associated with migratory flight were relatively small, suggesting that the level of muscle damage is moderate. Migrants may avoid damage behaviourally, or have efficient biochemical and physiological defences against muscle injury.

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“…Environmental variability inherently structures biological communities and is frequently observed in aquatic systems as hydrologic disturbances [ 1 ]. Flooding and drying of ephemeral habitats can affect aquatic invertebrate communities via direct mortality (e.g., [ 2 – 3 ]). Direct mortality and the resultant changes to the composition of communities from hydrologic changes have been relatively well-studied in ponds (e.g., [ 4 ]), streams (e.g., [ 1 ]), and some ephemeral container systems, such as water-filled tree holes (e.g., [ 5 ]).…”

Section: Introductionmentioning

confidence: 99%

Prior Hydrologic Disturbance Affects Competition between Aedes Mosquitoes via Changes in Leaf Litter

2015

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Allochthonous leaf litter is often the main resource base for invertebrate communities in ephemeral water-filled containers, and detritus quality can be affected by hydrologic conditions. The invasive mosquito Aedes albopictus utilizes container habitats for its development where it competes as larvae for detritus and associated microorganisms with the native Aedes triseriatus. Different hydrologic conditions that containers are exposed to prior to mosquito utilization affect litter decay and associated water quality. We tested the hypothesis that larval competition between A. albopictus and A. triseriatus would be differentially affected by prior hydrologic conditions. Experimental microcosms provisioned with Quercus alba L. litter were subjected to one of three different hydrologic treatments prior to the addition of water and mosquito larvae: dry, flooded, and a wet/dry cycle. Interspecific competition between A. albopictus and A. triseriatus was mediated by hydrologic treatment, and was strongest in the dry treatment vs. the flooded or wet/dry treatments. Aedes triseriatus estimated rate of population change (λ') was lowest in the dry treatment. Aedes albopictus λ' was unaffected by hydrologic treatment, and was on average always increasing (i.e., > 1). Aedes triseriatus λ' was affected by the interaction of hydrologic treatment with interspecific competition, and was on average declining (i.e., < 1.0), at the highest interspecific densities in the dry treatment. Dry treatment litter had the slowest decay rate and leached the highest concentration of tannin-lignin, but supported more total bacteria than the other treatments. These results suggest that dry conditions negatively impact A. triseriatus population performance and may result in the competitive exclusion of A. triseriatus by A. albopictus, possibly by reducing microbial taxa that Aedes species browse. Changing rainfall patterns with climate change are likely to affect competition between A. triseriatus and A. albopictus, probably enhancing negative competitive effects of A. albopictus on A. triseriatus in areas that experience drought.

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Elevated serum enzyme activity: an explanation-based model

Cited by 4 publications

References 0 publications

Neuromuscular recovery after a strength training session in elderly people

Neuromuscular recovery after a strength training session in elderly people

A sport-physiological perspective on bird migration: evidence for flight-induced muscle damage

Prior Hydrologic Disturbance Affects Competition between Aedes Mosquitoes via Changes in Leaf Litter

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