Search Results - "MacIntosh, Brian R."

What Is Moderate to Vigorous Exercise Intensity? by MacIntosh, Brian R., Murias, Juan M., Keir, Daniel A., Weir, Jamie M.

“…A variety of health benefits associated with physical activity depends upon the frequency, intensity, duration, and type of exercise. Intensity of exercise is…”
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Running Economy from a Muscle Energetics Perspective by Fletcher, Jared R, MacIntosh, Brian R

“…The economy of running has traditionally been quantified from the mass-specific oxygen uptake; however, because fuel substrate usage varies with exercise…”
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A stochastic simulation of skeletal muscle calcium transients in a structurally realistic sarcomere model using MCell by Holash, Robert John, MacIntosh, Brian R

“…Skeletal muscle contraction is initiated when an action potential triggers the release of Ca2+ into the sarcomere in a process referred to as…”
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Skeletal muscle fatigue--regulation of excitation-contraction coupling to avoid metabolic catastrophe by MacIntosh, Brian R, Holash, Robert J, Renaud, Jean-Marc

“…ATP provides the energy in our muscles to generate force, through its use by myosin ATPases, and helps to terminate contraction by pumping Ca(2+) back into the…”
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Economy of running: beyond the measurement of oxygen uptake by Fletcher, Jared R, Esau, Shane P, MacIntosh, Brian R

“…Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada Submitted 23 March 2009 ; accepted in final form 9…”
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Force–frequency relationship during fatiguing contractions of rat medial gastrocnemius muscle by MacDougall, Keenan B., Devrome, Andrea N., Kristensen, Anders M., MacIntosh, Brian R.

“…The force–frequency relationship presents the amount of force a muscle can produce as a function of the frequency of activation. During repetitive muscular…”
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Role of Ca2+ in changing active force during intermittent submaximal stimulation in intact, single mouse muscle fibers by Glass, Lisa D., Cheng, Arthur J., MacIntosh, Brian R.

“…Fatigue of single mouse fibers during repeated high-frequency stimulation results initially from decreased Ca 2+ sensitivity while free myoplasmic calcium…”
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Greater Short-Time Recovery of Peripheral Fatigue After Short- Compared With Long-Duration Time Trial by Froyd, Christian, Beltrami, Fernando G., Millet, Guillaume Y., MacIntosh, Brian R., Noakes, Timothy D.

“…The kinetics of recovery from neuromuscular fatigue resulting from exercise time trials (TTs) of different durations are not well-known. The aim of this study…”
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Can muscle shortening alone, explain the energy cost of muscle contraction in vivo? by Fletcher, Jared R., Groves, Erik M., Pfister, Ted R., MacIntosh, Brian R.

“…Purpose Decreased whole-body energy cost of running has been associated with an increased Achilles tendon stiffness. It is usually assumed that this lower…”
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Changes in Achilles tendon stiffness and energy cost following a prolonged run in trained distance runners by Fletcher, Jared R, MacIntosh, Brian R

“…During prolonged running, the magnitude of Achilles tendon (AT) length change may increase, resulting in increased tendon strain energy return with each step…”
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Static stretching alters neuromuscular function and pacing strategy, but not performance during a 3-km running time-trial by Damasceno, Mayara V, Duarte, Marcos, Pasqua, Leonardo A, Lima-Silva, Adriano E, MacIntosh, Brian R, Bertuzzi, Rômulo

“…Previous studies report that static stretching (SS) impairs running economy. Assuming that pacing strategy relies on rate of energy use, this study aimed to…”
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Recent developments in understanding the length dependence of contractile response of skeletal muscle by MacIntosh, Brian R.

“…Maximal active force of skeletal muscle contraction occurs at a sarcomere length where overlap of thick and thin filaments is optimal. However, the interaction…”
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Role of Calcium Sensitivity Modulation in Skeletal Muscle Performance by MacIntosh, Brian R

“…Brian R. MacIntosh Faculty of Kinesiology and Faculty of Medicine, University of Calgary, Calgary, Alberta T2N 2N4, Canada A common mechanism affecting Ca 2+…”
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The Relationship Between Length and Active Force for Submaximal Skeletal Muscle Contractions: a Review by Zimmermann, Haiko Bruno, Macintosh, Brian R., Pupo, Juliano Dal

“…The force-length relationship is usually obtained for isometric contractions with maximal activation, but less is known about how sarcomere length affects…”
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Efficiency of cycling exercise: Understanding the physiology by MacDougall, Keenan B., MacIntosh, Brian R.

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The length dependence of muscle active force: considerations for parallel elastic properties by MacIntosh, Brian R, MacNaughton, Meredith B

“…Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada Submitted 23 September 2004 ; accepted in final form 9…”
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Efficiency of cycling exercise: Quantification, mechanisms, and misunderstandings by MacDougall, Keenan B., Falconer, Tara M., MacIntosh, Brian R.

“…The energetics of cycling represents a well‐studied area of exercise science, yet there are still many questions that remain. Efficiency, broadly defined as…”
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Changes in tendon stiffness and running economy in highly trained distance runners by FLETCHER, Jared R, ESAU, Shane P, MACINTOSH, Brian R, WARD, Susan

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Achilles tendon strain energy in distance running: consider the muscle energy cost by Fletcher, Jared R, MacIntosh, Brian R

“…The return of tendon strain energy is thought to contribute to reducing the energy cost of running (Erun). However, this may not be consistent with the notion…”
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Nonlocalized postactivation performance enhancement (PAPE) effects in trained athletes: a pilot study by Cuenca-Fernández, Francisco, Smith, Ian C, Jordan, Matthew J, MacIntosh, Brian R, López-Contreras, Gracia, Arellano, Raúl, Herzog, Walter

“…Fifteen trained athletes were assessed for postactivation performance enhancement (PAPE) of squat jumps (SJs) and power push-ups (PPUs) following upper body…”
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