James P. Morton
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View article: ¹³C labelled glucose-fructose show greater exogenous and whole-body CHO oxidation and lower O₂ cost of running at 120 vs 60 & 90 g·h⁻¹ in elite male marathoners
¹³C labelled glucose-fructose show greater exogenous and whole-body CHO oxidation and lower O₂ cost of running at 120 vs 60 & 90 g·h⁻¹ in elite male marathoners Open
We evaluated the effects of carbohydrate (CHO) ingestion at rates of 60 (maltodextrin:fructose ratio 1:0), 90 (2:1), and 120 (1:1) g·h⁻¹ on whole body substrate metabolism, exogenous CHO oxidation (via U- 13 C enriched glucose-fructose dri…
View article: Endocrine, Metabolic, and Skeletal Muscle Proteomic Responses During Energy Deficit With Concomitant Aerobic Exercise in Humans
Endocrine, Metabolic, and Skeletal Muscle Proteomic Responses During Energy Deficit With Concomitant Aerobic Exercise in Humans Open
Energy deficit is a potent physiological stressor that has shaped human evolution and can improve lifespan and healthspan in a wide range of species. Preserving locomotive capacity was likely essential for survival during the human hunter‐…
View article: Body Composition Characteristics of Senior Male Players in the English Premier and Football Leagues: Insights from Dual-Energy X-ray Absorptiometry
Body Composition Characteristics of Senior Male Players in the English Premier and Football Leagues: Insights from Dual-Energy X-ray Absorptiometry Open
Body composition assessments in professional male football often lack sport-specific evidence, risking mismanagement of player health and performance. This study described dual-energy X-ray absorptiometry (DXA)-derived values by playing po…
View article: Co‐ingesting whey protein with dual‐source carbohydrate enhances amino acid availability without compromising post‐exercise liver glycogen resynthesis
Co‐ingesting whey protein with dual‐source carbohydrate enhances amino acid availability without compromising post‐exercise liver glycogen resynthesis Open
We examined the effects of ingesting maltodextrin and/or fructose with protein co‐ingestion on post‐exercise liver and muscle glycogen resynthesis. Following glycogen‐depleting exercise, 10 well‐trained male cyclists ingested 60 g h −1 car…
View article: Should sports scientists and coaches provide sodium supplementation to professional soccer players? Insights from English premier league players
Should sports scientists and coaches provide sodium supplementation to professional soccer players? Insights from English premier league players Open
We assessed the fluid balance, whole body sweat rate (WBSR) and sweat sodium concentration ([Na + ] sweat ) of English Premier League (EPL) soccer players during pre-season training and used predictive modelling to determine theoretical ch…
View article: Skeletal muscle proteomic responses to energy deficit with concomitant aerobic exercise in humans
Skeletal muscle proteomic responses to energy deficit with concomitant aerobic exercise in humans Open
Energy deficit is a potent physiological stressor that has shaped human evolution and can improve lifespan and healthspan in a wide range of species. Preserving locomotive capacity was likely essential for survival during the human hunter-…
View article: Fuel-90: validation of a questionnaire to assess players’ knowledge of carbohydrate guidelines for soccer
Fuel-90: validation of a questionnaire to assess players’ knowledge of carbohydrate guidelines for soccer Open
Purpose Professional soccer players typically under-consume carbohydrate in relation to contemporary guidelines, where their dietary behaviors may, in part, be underpinned by lack of knowledge. Accordingly, we aimed to develop and validate…
View article: Author Correction: Predictive equation derived from 6,497 doubly labelled water measurements enables the detection of erroneous self-reported energy intake
Author Correction: Predictive equation derived from 6,497 doubly labelled water measurements enables the detection of erroneous self-reported energy intake Open
View article: Fueling Soccer Players: A Scoping Review and Audit of Literature Related to Soccer-Specific Guidelines for Carbohydrate Intake
Fueling Soccer Players: A Scoping Review and Audit of Literature Related to Soccer-Specific Guidelines for Carbohydrate Intake Open
Background Professional soccer players are advised to consume 3–8 g kg –1 body mass day –1 of carbohydrate (CHO) on the basis of training demands, fixture schedule and personal objectives. However, owing to the lack of randomized controlle…
View article: Predictive equation derived from 6,497 doubly labelled water measurements enables the detection of erroneous self-reported energy intake
Predictive equation derived from 6,497 doubly labelled water measurements enables the detection of erroneous self-reported energy intake Open
View article: Professional Male Soccer Players’ Perspectives of the Nutrition Culture Within an English Premier League Football Club: A Qualitative Exploration Using Bourdieu’s Concepts of Habitus, Capital and Field
Professional Male Soccer Players’ Perspectives of the Nutrition Culture Within an English Premier League Football Club: A Qualitative Exploration Using Bourdieu’s Concepts of Habitus, Capital and Field Open
View article: Nutrition and Golf Performance: A Systematic Scoping Review
Nutrition and Golf Performance: A Systematic Scoping Review Open
View article: Nutritional habits of professional team sport athletes: An insight into the carbohydrate, fluid, and caffeine habits of English Premier League football players during match play
Nutritional habits of professional team sport athletes: An insight into the carbohydrate, fluid, and caffeine habits of English Premier League football players during match play Open
To better understand the in-match fuelling practices of elite football players and compare against current guidelines, we quantified the carbohydrate, fluid, and caffeine intake of players from an English Premier League club (n = 22…
View article: A broken link: Knowledge of carbohydrate requirements do not predict carbohydrate intake around competition in endurance athletes
A broken link: Knowledge of carbohydrate requirements do not predict carbohydrate intake around competition in endurance athletes Open
Endurance athletes fail to meet carbohydrate (CHO) guidelines for competition, which may be due to limited knowledge. However, the relationship between knowledge and practice in this population is unknown. To investigate this, we assessed …
View article: Training with reduced carbohydrate availability affects markers of bone resorption and formation in male academy soccer players from the English Premier League
Training with reduced carbohydrate availability affects markers of bone resorption and formation in male academy soccer players from the English Premier League Open
View article: Energy expenditure, intake and availability in female soccer players via doubly labelled water: Are we misrepresenting low energy availability?
Energy expenditure, intake and availability in female soccer players via doubly labelled water: Are we misrepresenting low energy availability? Open
Female soccer players have been identified as presenting with low energy availability (LEA), though the prevalence of LEA may be overestimated given inaccuracies associated with self‐reporting dietary intakes. Accordingly, we aimed to quan…
View article: Plant Protein Blend Ingestion Stimulates Postexercise Myofibrillar Protein Synthesis Rates Equivalently to Whey in Resistance-Trained Adults
Plant Protein Blend Ingestion Stimulates Postexercise Myofibrillar Protein Synthesis Rates Equivalently to Whey in Resistance-Trained Adults Open
Purpose Whey protein ingestion is typically considered an optimal dietary strategy to maximize myofibrillar protein synthesis (MyoPS) after resistance exercise. Although single-source plant protein ingestion is typically less effective, at…
View article: The Relationships Between External and Internal Training Loads in Mixed Martial Arts
The Relationships Between External and Internal Training Loads in Mixed Martial Arts Open
Purpose : As a multidisciplined combat sport, relationships between external and internal training loads and intensities of mixed martial arts (MMA) have not been described. The aim of this study was to determine the external loads and int…
View article: Under-Fuelling for the Work Required? Assessment of Dietary Practices and Physical Loading of Adolescent Female Soccer Players during an Intensive International Training and Game Schedule
Under-Fuelling for the Work Required? Assessment of Dietary Practices and Physical Loading of Adolescent Female Soccer Players during an Intensive International Training and Game Schedule Open
Previous studies demonstrate that “under-fuelling” (i.e., reduced carbohydrate (CHO) and energy intake (EI) in relation to recommended guidelines) is prevalent within adult female soccer players, the consequence of which may have acute per…
View article: Greater male variability in daily energy expenditure develops through puberty
Greater male variability in daily energy expenditure develops through puberty Open
There is considerably greater variation in metabolic rates between men than between women, in terms of basal, activity and total (daily) energy expenditure (EE). One possible explanation is that EE is associated with male sexual characteri…
View article: Daily energy requirements of male academy soccer players are greater than age-matched non-academy soccer players: A doubly labelled water investigation
Daily energy requirements of male academy soccer players are greater than age-matched non-academy soccer players: A doubly labelled water investigation Open
This study aimed to test the hypothesis that the total daily energy expenditure (TDEE) of male academy soccer players is greater than players not enrolled on a formalised academy programme. English Premier League academy (ACAD: n = …
View article: Environmental heat stress offsets adaptation associated with carbohydrate periodization in trained male triathletes
Environmental heat stress offsets adaptation associated with carbohydrate periodization in trained male triathletes Open
Purpose Carbohydrate (CHO) intake periodization via the sleep low train low (SL‐TL) diet–exercise model increases fat oxidation during exercise and may enhance endurance‐training adaptation and performance. Conversely, training under envir…
View article: Case-study: Energy expenditure of a world class male wheelchair tennis player during training, Grand Slam and British Open tournaments measured by doubly labelled water
Case-study: Energy expenditure of a world class male wheelchair tennis player during training, Grand Slam and British Open tournaments measured by doubly labelled water Open
The assessment of total energy expenditure (TEE) is imperative to ensure appropriate fuelling during competition and training, although the current lack of TEE research in para sport make the prescription of nutritional strategies challeng…
View article: Hormonal contraceptive use, menstrual cycle characteristics and training/nutrition related profiles of elite, sub-elite and amateur athletes and exercisers: One size is unlikely to fit all
Hormonal contraceptive use, menstrual cycle characteristics and training/nutrition related profiles of elite, sub-elite and amateur athletes and exercisers: One size is unlikely to fit all Open
The aim of the present study was to simultaneously audit hormonal contraceptive (HC) use, menstrual cycle characteristics and training/nutrition related profiles in pre-menopausal women from varying athletic and exercise backgrounds. Elite…
View article: Acute heat stress amplifies exercise‐induced metabolomic perturbations and reveals variation in circulating amino acids in endurance‐trained males
Acute heat stress amplifies exercise‐induced metabolomic perturbations and reveals variation in circulating amino acids in endurance‐trained males Open
Using untargeted metabolomics, we aimed to characterise the systemic impact of environmental heat stress during exercise. Twenty‐three trained male triathletes ( = 64.8 ± 9.2 ml kg min −1 ) completed a 30‐min exercise test in hot (35°C) an…
View article: Human skeletal muscle methylome after low carbohydrate energy balanced exercise
Human skeletal muscle methylome after low carbohydrate energy balanced exercise Open
We aimed to investigate the human skeletal muscle (SkM) DNA methylome after exercise in low carbohydrate (CHO) energy balance (with high fat) compared with exercise in low-CHO energy deficit (with low fat) conditions. The objective to iden…
View article: Conflict in Darfur - A Different Perspective
Conflict in Darfur - A Different Perspective Open
View article: Mind the gap: limited knowledge of carbohydrate guidelines for competition in an international cohort of endurance athletes
Mind the gap: limited knowledge of carbohydrate guidelines for competition in an international cohort of endurance athletes Open
Despite the well-documented role of carbohydrate (CHO) in promoting endurance exercise performance, endurance athletes typically fail to meet current recommendations in competition. Adequate nutrition knowledge is key to drive athletes’ be…
View article: Variation in human water turnover associated with environmental and lifestyle factors
Variation in human water turnover associated with environmental and lifestyle factors Open
Water is essential for survival, but one in three individuals worldwide (2.2 billion people) lacks access to safe drinking water. Water intake requirements largely reflect water turnover (WT), the water used by the body each day. We invest…
View article: Where do you go when your periods go?: A case-study examining secondary amenorrhea in a professional internationally-capped female soccer player through the lens of the sport nutritionist
Where do you go when your periods go?: A case-study examining secondary amenorrhea in a professional internationally-capped female soccer player through the lens of the sport nutritionist Open
This case study follows a professional internationally capped female soccer player's two-year journey from eumenorrhea, through injury, to amenorrhea, and the challenges faced by the player and nutritionist. The two years are split into th…