Charles S. Urwin

ORCID: 0000-0002-9467-0077
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About
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Research Areas
  • Muscle metabolism and nutrition
  • Renal function and acid-base balance
  • Diet and metabolism studies
  • Exercise and Physiological Responses
  • Cardiovascular and exercise physiology
  • Sports Performance and Training
  • Thermoregulation and physiological responses
  • Sleep and related disorders
  • Heart Rate Variability and Autonomic Control
  • High Altitude and Hypoxia
  • Biochemical effects in animals
  • Pharmacology and Obesity Treatment
  • Cancer Treatment and Pharmacology
  • Sleep and Wakefulness Research
  • Coagulation, Bradykinin, Polyphosphates, and Angioedema
  • Workplace Health and Well-being
  • Sleep and Work-Related Fatigue

Deakin University
2018-2024

Sodium citrate induces alkalosis and can provide a performance benefit in high-intensity exercise. Previous investigations have been inconsistent the ingestion protocols used, particular dose timing of before onset The primary aim current study was to quantify blood pH, bicarbonate concentration gastrointestinal symptoms after three doses sodium (500 mg⋅kg-1, 700 mg⋅kg-1 900 mg⋅kg-1). Thirteen participants completed four experimental sessions, each consisting different or taste-matched...

10.1123/ijsnem.2015-0336 article EN International Journal of Sport Nutrition and Exercise Metabolism 2016-04-20

To compare the effect of 500 mg·kg-1 body mass (BM) sodium citrate ingested in solution or capsules on induced alkalosis, gastrointestinal symptoms and palatability. Twenty-four healthy active participants completed two testing sessions, ingesting BM within capsules. Capillary blood samples were collected pre-ingestion, every 30-min for 240-min post-ingestion; analyzed pH [HCO3- ]. A validated questionnaire was used to quantify at same intervals. Palatability quantified immediately after...

10.14814/phy2.14216 article EN cc-by Physiological Reports 2019-10-01

Hot-water immersion (HWI) after training in temperate conditions has been shown to induce thermophysiological adaptations and improve endurance performance the heat; however, potential additive effects of HWI hot outdoor remain unknown. Therefore, this study aimed determine effect repeated postexercise athletes a environment.A total 13 (9 female) elite/preelite racewalkers completed 15-day program heat (mean afternoon high temperature = 34.6°C). Athletes were divided into 2 matched groups...

10.1123/ijspp.2020-0114 article EN International Journal of Sports Physiology and Performance 2020-09-01

Abstract Background Palmitoylethanolamide (PEA) has analgesic/anti-inflammatory properties that may be a suitable alternative to over-the-counter (OTC) non-steroidal analgesics/anti-inflammatories. While OTC pain medications can impair strength training adaptations, the mechanism of action PEA is distinct from these and it not negatively affect skeletal muscle adaptations training. Methods The primary aim this study was investigate effects daily supplementation (350 mg Levagen + equivalent...

10.1186/s40798-024-00732-6 article EN cc-by Sports Medicine - Open 2024-06-07

Abstract Background This study assessed relationships and sex differences between psychological state (recovery, stress, anxiety, self-confidence) gastrointestinal symptoms (GIS) prior to during a 56 km ultramarathon running race identified predictive factors of GIS. Forty-four (26 males, 18 females) competitors completed recovery, stress GIS questionnaires for three days the immediately pre-race. Race were post-race. Spearman’s rank order, Mann–Whitney U tests regression analyses used...

10.1186/s40798-021-00389-5 article EN cc-by Sports Medicine - Open 2021-12-01

This study examined sex differences among endurance athletes in pre-race relationships between sleep, and perceived stress recovery. Thirty-six completed the Short Recovery Stress Scale, had sleep monitored via actigraphy, over four consecutive days prior to an ultra-marathon. Overall, compared with males, females shorter wake after onset (mean ± SD, 50 23 vs 65 min, p = .04) lower emotional balance (3.9 1.1 4.8 arbitrary units, .001). The day before race, scored higher for all...

10.1080/02640414.2022.2091345 article EN Journal of Sports Sciences 2022-06-29

Objectives To compare blood alkalosis, gastrointestinal symptoms and indicators of strong ion difference after ingestion 500 mg.kg -1 BM sodium citrate over four different periods. Methods Sixteen healthy active participants ingested in gelatine capsules a 15, 30, 45 or 60 min period using randomized cross-over experimental design. Gastrointestinal questionnaires venous samples were collected before ingestion, immediately post-ingestion, every 30 for 480 post-ingestion. Blood analysed pH,...

10.1371/journal.pone.0251808 article EN cc-by PLoS ONE 2021-05-17

This study compared the recommended dose of sodium citrate (SC, 500 mg/kg body mass) and bicarbonate (SB, 300 for blood alkalosis (blood [HCO 3 − ]) gastrointestinal symptoms (GIS; number severity). Sixteen healthy individuals ingested supplements in a randomized, crossover design. Gelatin capsules were over 15 min alongside carbohydrate-rich meal, after which participants remained seated forearm venous sample collection completion GIS questionnaires every 30 min. Time-course session value...

10.1123/ijsnem.2022-0083 article EN International Journal of Sport Nutrition and Exercise Metabolism 2022-09-15

Abstract Aims To explore the relationship between nutritional intake, fermentable oligo‐, di, monosaccharides and polyols, carbohydrate malabsorption, with gastrointestinal symptoms during a 56 km trail ultramarathon event identify differences in intake runners severe non‐severe symptoms. Methods Forty‐four ultramarathoners recorded self‐reported dietary 3 days before, morning of, obtained retrospectively nutrient analysis via FoodWorks. Carbohydrate malabsorption was determined breath...

10.1111/1747-0080.12870 article EN cc-by-nc Nutrition & Dietetics 2024-04-18
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