C . P . McGowan , H . A . Duarte , J . B . Main and A . A . Biewener ) meleagris Numidahindlimb muscle dynamics in guinea fowl ( Effects of load carrying on metabolic cost and
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meleagris Numida hindlimb muscle dynamics in guinea fowl (Effects of load carrying on metabolic cost and You might find this additional information useful... those papers emphasizing adaptive and integrative mechanisms. It is published 12 times a year (monthly) by the American publishes original papers that deal with diverse areas of research in applied physiology, especially Journal of Applied Physiology
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Effects of load carrying on metabolic cost and hindlimb muscle dynamics in guinea fowl (Numida meleagris).
The goal of this study was to test whether the contractile patterns of two major hindlimb extensors of guinea fowl are altered by load-carrying exercise. We hypothesized that changes in contractile pattern, specifically a decrease in muscle shortening velocity or enhanced stretch activation, would result in a reduction in locomotor energy cost relative to the load carried. We also anticipated t...
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The application of artificial loads to mammals and birds has been used to provide insight into the mechanics and energetic cost of terrestrial locomotion. However, only two species of bird have previously been used in loading experiments, the cursorial guinea fowl (Numida meleagris) and the locomotor-generalist barnacle goose (Branta leucopsis). Here, using respirometry and treadmill locomotion...
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MUSCLES ARE THE MOTORS that power our movements, and, like all motors, muscles consume energy to carry out these actions. Quantifying the efficiency of locomotion (i.e., the mechanical power output divided by the metabolic power input) is the standard approach for relating the mechanics and energetics of movement. However, this approach is problematic when applied to legged locomotion such as w...
متن کاملThe energetic costs of trunk and distal-limb loading during walking and running in guinea fowl Numida meleagris: II. Muscle energy use as indicated by blood flow.
We examined the changes in muscle energy use in guinea fowl running at 1.5 m s-1 either unloaded, or carrying trunk loads equal to 23% of body mass, or loads on their distal legs equal to a total of 5% of body mass. We estimated muscle energy use by measuring blood flow to all of the leg muscles using injected microspheres. Total blood flow to the leg muscles increased by approximately 15% unde...
متن کاملThe energetic costs of trunk and distal-limb loading during walking and running in guinea fowl Numida meleagris: I. Organismal metabolism and biomechanics.
We examined the energetic cost of loading the trunk or distal portion of the leg in walking and running guinea fowl (Numida meleagris). These different loading regimes were designed to separately influence the energy use by muscles used during the stance and swing phases of the stride. Metabolic rate, estimated from oxygen consumption, was measured while birds locomoted on a motorized treadmill...
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