Skip to main content

Research Repository

Advanced Search

Professor KENNETH SMITH's Outputs (79)

Acute cocoa flavanol supplementation improves muscle macro- and microvascular but not anabolic responses to amino acids in older men (2016)
Journal Article
Phillips, B. E., Atherton, P. J., Varadhan, K., Limb, M. C., Williams, J. P., & Smith, K. (in press). Acute cocoa flavanol supplementation improves muscle macro- and microvascular but not anabolic responses to amino acids in older men. Applied Physiology, Nutrition, and Metabolism, 41(5), https://doi.org/10.1139/apnm-2015-0543

The anabolic effects of nutrition on skeletal muscle may depend on adequate skeletal muscle perfusion, which is impaired in older people. Cocoa flavanols have been shown to improve flow-mediated dilation, an established measure of endothelial functio... Read More about Acute cocoa flavanol supplementation improves muscle macro- and microvascular but not anabolic responses to amino acids in older men.

Relative Contribution of Intramyocellular Lipid to Whole-Body Fat Oxidation Is Reduced With Age but Subsarcolemmal Lipid Accumulation and Insulin Resistance Are Only Associated With Overweight Individuals (2016)
Journal Article
Chee, C., Shannon, C. E., Burns, A., Selby, A. L., Wilkinson, D., Smith, K., Greenhaff, P. L., & Stephens, F. B. (2016). Relative Contribution of Intramyocellular Lipid to Whole-Body Fat Oxidation Is Reduced With Age but Subsarcolemmal Lipid Accumulation and Insulin Resistance Are Only Associated With Overweight Individuals. Diabetes, 65(4), 840-850. https://doi.org/10.2337/db15-1383

© 2016 by the American Diabetes Association. Insulin resistance is closely related to intramyocellular lipid (IMCL) accumulation, and both are associated with increasing age. It remains to be determined to what extent perturbations in IMCL metabolism... Read More about Relative Contribution of Intramyocellular Lipid to Whole-Body Fat Oxidation Is Reduced With Age but Subsarcolemmal Lipid Accumulation and Insulin Resistance Are Only Associated With Overweight Individuals.

Early structural remodeling and deuterium oxide-derived protein metabolic responses to eccentric and concentric loading in human skeletal muscle (2015)
Journal Article
Franchi, M. V., Wilkinson, D. J., Quinlan, J. I., Mitchell, W. K., Lund, J. N., Williams, J. P., Reeves, N. D., Smith, K., Atherton, P. J., & Narici, M. V. (2015). Early structural remodeling and deuterium oxide-derived protein metabolic responses to eccentric and concentric loading in human skeletal muscle. Physiological Reports, 3(11), Article e12593. https://doi.org/10.14814/phy2.12593

We recently reported that the greatest distinguishing feature between eccentric (ECC) and concentric (CON) muscle loading lays in architectural adaptations: ECC favors increases in fascicle length (Lf), associated with distal vastus lateralis muscle... Read More about Early structural remodeling and deuterium oxide-derived protein metabolic responses to eccentric and concentric loading in human skeletal muscle.

The impact of delivery profile of essential amino acids upon skeletal muscle protein synthesis in older men: clinical efficacy of pulse vs. bolus supply (2015)
Journal Article
Mitchell, W. K., Phillips, B. E., Williams, J. P., Rankin, D., Lund, J. N., Wilkinson, D. J., Smith, K., & Atherton, P. J. (2015). The impact of delivery profile of essential amino acids upon skeletal muscle protein synthesis in older men: clinical efficacy of pulse vs. bolus supply. AJP - Endocrinology and Metabolism, 309(5), Article E450-E457. https://doi.org/10.1152/ajpendo.00112.2015

Essential amino acids (EAA) are responsible for skeletal muscle anabolic effects after nutrient intake. The pattern of appearance of EAA in blood, e.g., after intake of “slow” or “fast” protein sources or in response to grazing vs. bolus feeding patt... Read More about The impact of delivery profile of essential amino acids upon skeletal muscle protein synthesis in older men: clinical efficacy of pulse vs. bolus supply.

Obesity appears to be associated with altered muscle protein synthetic and breakdown responses to increased nutrient delivery in older men, but not reduced muscle mass or contractile function. (2015)
Journal Article
Murton, A. J., Marimuthu, K., Mallinson, J. E., Selby, A. L., Smith, K., Rennie, M. J., & Greenhaff, P. L. (2015). Obesity appears to be associated with altered muscle protein synthetic and breakdown responses to increased nutrient delivery in older men, but not reduced muscle mass or contractile function. Diabetes, 64(9), https://doi.org/10.2337/db15-0021

Obesity is increasing, yet despite the necessity to maintain muscle mass and function with age, the effect of obesity on muscle protein turnover in older adults remains unknown. Eleven obese (BMI 31.9 ±1.1) and 15 healthy weight (HW; BMI 23.4 ±0.3) o... Read More about Obesity appears to be associated with altered muscle protein synthetic and breakdown responses to increased nutrient delivery in older men, but not reduced muscle mass or contractile function..

Internal comparison between deuterium oxide (D2O) and L-[ring-13C6] phenylalanine for acute measurement of muscle protein synthesis in humans (2015)
Journal Article
Smith, K., Cegielski, J., Wilkinson, D., Phillips, B., Boereboom, C., Lund, J., & Atherton, P. (2015). Internal comparison between deuterium oxide (D2O) and L-[ring-13C6] phenylalanine for acute measurement of muscle protein synthesis in humans. Physiological Reports, 3(7), Article e12433. https://doi.org/10.14814/phy2.12433

Stable isotope tracer methodologies are becoming increasingly widespread in metabolic research; yet a number of factors restrict their implementation, such as, i.v infusions, multiple cannulae, tissue samples, and significant cost. We recently valida... Read More about Internal comparison between deuterium oxide (D2O) and L-[ring-13C6] phenylalanine for acute measurement of muscle protein synthesis in humans.

The effects of resistance exercise training on macro- and micro-circulatory responses to feeding and skeletal muscle protein anabolism in older men (2015)
Journal Article
Phillips, B. E., Atherton, P. J., Varadhan, K., Limb, M. C., Wilkinson, D. J., Sjøberg, K. A., Smith, K., & Williams, J. P. (2015). The effects of resistance exercise training on macro- and micro-circulatory responses to feeding and skeletal muscle protein anabolism in older men. Journal of Physiology, 593(12), https://doi.org/10.1113/JP270343

The anabolic effects of dietary protein on skeletal muscle depend on adequate skeletal muscle perfusion, which is impaired in older people. This study explores fed state muscle microvascular blood flow, protein metabolism and exercise training status... Read More about The effects of resistance exercise training on macro- and micro-circulatory responses to feeding and skeletal muscle protein anabolism in older men.

Intake of low-dose leucine-rich essential amino acids stimulates muscle anabolism equivalently to bolus whey protein in older women at rest and after exercise (2015)
Journal Article
Bukhari, S. S., Phillips, B. E., Wilkinson, D. J., Limb, M. C., Rankin, D., Mitchell, W. K., Kobayashi, H., Greenhaff, P. L., Smith, K., & Atherton, P. J. (2015). Intake of low-dose leucine-rich essential amino acids stimulates muscle anabolism equivalently to bolus whey protein in older women at rest and after exercise. AJP - Endocrinology and Metabolism, 308(12), E1056-E1065. https://doi.org/10.1152/ajpendo.00481.2014

© 2015 American Physiological Society. All Rights Reseved. Dysregulated anabolic responses to nutrition/exercise may contribute to sarcopenia; however, these characteristics are poorly defined in female populations. We determined the effects of two f... Read More about Intake of low-dose leucine-rich essential amino acids stimulates muscle anabolism equivalently to bolus whey protein in older women at rest and after exercise.

Statin myalgia is not associated with reduced muscle strength, mass or protein turnover in older male volunteers, but is allied with a slowing of time to peak power output, insulin resistance and differential muscle mRNA expression: Statin myalgia, muscle function and metabolism (2015)
Journal Article
Selby, A., Murton, A., Mallinson, J. E., Marimuthu, K., Murton, A. J., Selby, A. L., Smith, K., Constantin-Teodosiu, D., Rennie, M. J., & Greenhaff, P. L. (2015). Statin myalgia is not associated with reduced muscle strength, mass or protein turnover in older male volunteers, but is allied with a slowing of time to peak power output, insulin resistance and differential muscle mRNA expression: Statin myalgia, muscle function and metabolism. Journal of Physiology, 593(5), 1239-1257. https://doi.org/10.1113/jphysiol.2014.285577

Statins are associated with muscle myalgia and myopathy, which probably reduce habitual physical activity. This is particularly relevant to older people who are less active, sarcopaenic and at increased risk of statin myalgia. We hypothesised that st... Read More about Statin myalgia is not associated with reduced muscle strength, mass or protein turnover in older male volunteers, but is allied with a slowing of time to peak power output, insulin resistance and differential muscle mRNA expression: Statin myalgia, muscle function and metabolism.

Skeletal muscle hypertrophy adaptations predominate in the early stages of resistance exercise training, matching deuterium oxide-derived measures of muscle protein synthesis and mechanistic target of rapamycin complex 1 signaling (2015)
Journal Article
Brook, M. S., Wilkinson, D. J., Mitchell, W. K., Lund, J. N., Szewczyk, N. J., Greenhaff, P. L., Smith, K., & Atherton, P. (2015). Skeletal muscle hypertrophy adaptations predominate in the early stages of resistance exercise training, matching deuterium oxide-derived measures of muscle protein synthesis and mechanistic target of rapamycin complex 1 signaling. FASEB Journal, 29(11), https://doi.org/10.1096/fj.15-273755

A dose- rather than delivery profile-dependent mechanism regulates the "muscle-full" effect in response to oral essential amino acid intake in young men (2014)
Journal Article
Mitchell, W. K., Phillips, B. E., Williams, J. P., Rankin, D., Lund, J. N., Smith, K., & Atherton, P. J. (2015). A dose- rather than delivery profile-dependent mechanism regulates the "muscle-full" effect in response to oral essential amino acid intake in young men. Journal of Nutrition, 145(2), https://doi.org/10.3945/jn.114.199604

Background: The anabolic response of skeletal muscle to essential amino acids (EAAs) is dose dependent, maximal at modest doses, and short lived, even with continued EAA availability, a phenomenon termed “muscle-full.” However, the effect of EAA inge... Read More about A dose- rather than delivery profile-dependent mechanism regulates the "muscle-full" effect in response to oral essential amino acid intake in young men.

Protein Carbonylation and Heat Shock Proteins in Human Skeletal Muscle: Relationships to Age and Sarcopenia (2014)
Journal Article
Beltran Valls, M. R., Wilkinson, D. J., Narici, M. V., Phillips, B. E., Smith, K., Caporossi, D., & Atherton, P. J. (2015). Protein Carbonylation and Heat Shock Proteins in Human Skeletal Muscle: Relationships to Age and Sarcopenia. Journals of Gerontology, Series A, 70(2), 174-181. https://doi.org/10.1093/gerona/glu007

Aging is associated with a gradual loss of muscle mass termed sarcopenia, which has significant impact on quality-of-life. Because oxidative stress is proposed to negatively impact upon musculoskeletal aging, we investigated links between human aging... Read More about Protein Carbonylation and Heat Shock Proteins in Human Skeletal Muscle: Relationships to Age and Sarcopenia.

A validation of the application of D2O stable isotope tracer techniques for monitoring day-to-day changes in muscle protein subfraction synthesis in humans (2013)
Journal Article
Wilkinson, D. J., Franchi, M. V., Brook, M. S., Narici, M. V., Williams, J. P., Mitchell, W. K., Szewczyk, N. J., Greenhaff, P. L., Atherton, P. J., & Smith, K. (2014). A validation of the application of D2O stable isotope tracer techniques for monitoring day-to-day changes in muscle protein subfraction synthesis in humans. AJP - Endocrinology and Metabolism, 306(5), Article E571-E579. https://doi.org/10.1152/ajpendo.00650.2013

Quantification of muscle protein synthesis (MPS) remains a cornerstone for understanding the control of muscle mass. Traditional [13C]amino acid tracer methodologies necessitate sustained bed rest and intravenous cannulation(s), restricting studies t... Read More about A validation of the application of D2O stable isotope tracer techniques for monitoring day-to-day changes in muscle protein subfraction synthesis in humans.

Pharmacological enhancement of leg and muscle microvascular blood flow does not augment anabolic responses in skeletal muscle of young men under fed conditions (2013)
Journal Article
Phillips, B. E., Atherton, P. J., Varadhan, K., Wilkinson, D. J., Limb, M. C., Selby, A. L., Rennie, M. J., Smith, K., & Williams, J. P. (2014). Pharmacological enhancement of leg and muscle microvascular blood flow does not augment anabolic responses in skeletal muscle of young men under fed conditions. AJP - Endocrinology and Metabolism, 306(2), Article E168-E176. https://doi.org/10.1152/ajpendo.00440.2013

Skeletal muscle anabolism associated with postprandial plasma aminoacidemia and insulinemia is contingent upon amino acids (AA) and insulin crossing the microcirculation-myocyte interface. In this study, we hypothesized that increasing muscle microva... Read More about Pharmacological enhancement of leg and muscle microvascular blood flow does not augment anabolic responses in skeletal muscle of young men under fed conditions.

Development of a new SonovueTM contrast-enhanced ultrasound approach reveals temporal and age-related features of muscle microvascular responses to feeding (2013)
Journal Article
features of muscle microvascular responses to feeding. Physiological Reports, 1(5), Article e00119. https://doi.org/10.1002/phy2.119

Compromised limb blood flow in aging may contribute to the development of sarcopenia, frailty, and the metabolic syndrome. We developed a novel contrast-enhanced ultrasound technique using Sonovue™ to characterize muscle microvasculature responses to... Read More about Development of a new SonovueTM contrast-enhanced ultrasound approach reveals temporal and age-related features of muscle microvascular responses to feeding.

Molecular networks of human muscle adaptation to exercise and age (2013)
Journal Article
Phillips, B. E., Williams, J. P., Gustafsson, T., Bouchard, C., Rankinen, T., Knudsen, S., Smith, K., Timmons, J. A., & Atherton, P. J. (2013). Molecular networks of human muscle adaptation to exercise and age. PLoS Genetics, 9(3), Article e1003389. https://doi.org/10.1371/journal.pgen.1003389

Physical activity and molecular ageing presumably interact to precipitate musculoskeletal decline in humans with age. Herein, we have delineated molecular networks for these two major components of sarcopenic risk using multiple independent clinical... Read More about Molecular networks of human muscle adaptation to exercise and age.

Effect of tumor burden and subsequent surgical resection on skeletal muscle mass and protein turnover in colorectal cancer patients (2012)
Journal Article
Williams, J. P., Phillips, B. E., Smith, K., Atherton, P. J., Rankin, D., Selby, A. L., Liptrot, S., Lund, J., Larvin, M., & Rennie, M. J. (2012). Effect of tumor burden and subsequent surgical resection on skeletal muscle mass and protein turnover in colorectal cancer patients. American Journal of Clinical Nutrition, 96(5), 1064-1070. https://doi.org/10.3945/ajcn.112.045708

Effect of colon cancer and surgical resection on skeletal muscle mitochondrial enzyme activity in colon cancer patients: a pilot study (2012)
Journal Article
Phillips, B. E., Smith, K., Liptrot, S., Atherton, P. J., Varadhan, K., Rennie, M. J., Larvin, M., Lund, J. N., & Williams, J. P. (2013). Effect of colon cancer and surgical resection on skeletal muscle mitochondrial enzyme activity in colon cancer patients: a pilot study. Journal of Cachexia, Sarcopenia and Muscle, 4(1), 71-77. https://doi.org/10.1007/s13539-012-0073-7