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Your search keyword '"Charles J. Steward"' showing total 4 results
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4 results on '"Charles J. Steward"'

1. Post‐exercise hot or cold water immersion does not alter perception of effort or neuroendocrine responses during subsequent moderate‐intensity exercise

Author

Campbell Menzies, Neil D. Clarke, Christopher J. A. Pugh, Charles J. Steward, C. Douglas Thake, and Tom Cullen

Subjects
cooling, exercise, heating, recovery, Physiology, QP1-981
Abstract

Abstract Post‐exercise hot (HWI) and cold (CWI) water immersion are popular strategies used by athletes in a range of sporting contexts, such as enhancing recovery or adaptation. However, prolonged heating bouts increase neuroendocrine responses that are associated with perceptions of fatigue. Fourteen endurance‐trained runners performed three trials consisting of two 45‐min runs at 95% lactate threshold on a treadmill separated by 6 h of recovery. Following the first run, participants completed one of HWI (30 min, 40°C), CWI (15 min, 14°C) or control (CON, 30 min rest in ambient conditions) in a randomised order. Perceived effort and recovery were measured using ratings of perceived exertion (RPE) and the Acute Recovery and Stress Scale (ARSS), whilst physiological responses including venous concentrations of a range of neuroendocrine markers, superficial femoral blood flow, heart rate and rectal temperature were measured. Exercise increased neuroendocrine responses of interleukin‐6, adrenaline and noradrenaline (all P 0.05), nor RPE (P = 0.68), despite differences in rectal temperature, superficial femoral blood flow following the first run, and participants’ expected recovery prior to the intervention (all P

Published
2024
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2. The effect of age and mitigation strategies during hot water immersion on orthostatic intolerance and thermal stress

Author

Charles J. Steward, Campbell Menzies, Neil D. Clarke, Amy E. Harwood, Mathew Hill, Christopher J. A. Pugh, C. Douglas Thake, and Tom Cullen

Subjects
heat, orthostasis, safety, Physiology, QP1-981
Abstract

Abstract Hot water immersion improves cardiovascular health and sporting performance, yet its adverse responses are understudied. Thirteen young and 17 middle‐aged adults (n = 30) were exposed to 2 × 30 min bouts of whole‐body 39°C water immersion. Young adults also completed cooling mitigation strategies in a randomized cross‐over design. Orthostatic intolerance and selected physiological, perceptual, postural and cognitive responses were assessed. Orthostatic hypotension occurred in 94% of middle‐aged adults and 77% of young adults. Young adults exhibited greater dizziness upon standing (young subjects, 3 out of 10 arbitrary units (AU) vs. middle‐aged subjects, 2 out of 10 AU), with four terminating the protocol early owing to dizziness or discomfort. Despite middle‐aged adults being largely asymptomatic, both age groups had transient impairments in postural sway after immersion (P

Published
2023
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3. One week of magnesium supplementation lowers IL-6, muscle soreness and increases post-exercise blood glucose in response to downhill running

Author

Gary Keane, Tom Cullen, Charles J Steward, Yunyi Liu, Yue Zhou, and Matthew David Cook

Subjects
Adult, Blood Glucose, Male, medicine.medical_specialty, Sports medicine, Physiology, chemistry.chemical_element, Inflammation, Carbohydrate metabolism, Placebo, Running, 03 medical and health sciences, 0302 clinical medicine, Double-Blind Method, Physiology (medical), Internal medicine, medicine, Humans, Magnesium, Orthopedics and Sports Medicine, Exercise physiology, Muscle, Skeletal, Creatine Kinase, Exercise, Cross-Over Studies, biology, Interleukin-6, business.industry, Public Health, Environmental and Occupational Health, Myalgia, 030229 sport sciences, General Medicine, Receptors, Interleukin-6, Crossover study, Endocrinology, chemistry, Dietary Supplements, biology.protein, Creatine kinase, medicine.symptom, business, 030217 neurology & neurosurgery
Abstract

Magnesium supplementation modulates glucose metabolism and inflammation, which could influence exercise performance and recovery. This study investigated the effect of magnesium intake on physiological responses and performance during eccentric exercise and recovery. Nine male recreational runners completed a counterbalanced, double-blind, placebo-controlled, cross-over study, registered at ClinicalTrial.gov. Participants consumed low magnesium diets and were supplemented with 500 mg/day of magnesium (SUP) or placebo (CON) for 7 days prior to a 10 km downhill (− 10%) running time trial (TT), separated by a 2-week washout period. At baseline and 24 h post-TT, maximal muscle force was measured. Interleukin-6 (IL-6), soluble interleukin-6 receptor (sIL-6R) and creatine kinase (CK) were measured at rest, 0 h, 1 h and 24 h post-TT. Muscle soreness was measured at the previous times plus 48 h and 72 h post. Glucose and lactate were measured during the TT. The main effect of condition was detected for IL-6 (SUP: 1.36 ± 0.66 vs CON: 2.06 ± 1.14 pg/ml) (P

Published
2019
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4. The health benefits of passive heating and aerobic exercise: To what extent do the mechanisms overlap?

Author

Christopher J. A. Pugh, Charles J Steward, Tom Cullen, Neil D. Clarke, Campbell Menzies, C. Douglas Thake, and Matthew Hill

Subjects
education.field_of_study, Physiology, business.industry, Acclimatization, Population, Health benefits, Passive heating, Heating, Cardiorespiratory Fitness, Physiology (medical), Environmental health, Aerobic exercise, Medicine, education, business, Exercise
Abstract

Exercise can induce numerous health benefits that can reduce the risk of chronic diseases and all-cause mortality, yet a significant percentage of the population do not meet minimal physical activity guidelines. Several recent studies have shown that passive heating can induce numerous health benefits, many of which are comparable with exercise, such as improvements to cardiorespiratory fitness, vascular health, glycemic control, and chronic low-grade inflammation. As such, passive heating is emerging as a promising therapy for populations who cannot perform sustained exercise or display poor exercise adherence. There appears to be some overlap between the cellular signaling responses that are regulated by temperature and the mechanisms that underpin beneficial adaptations to exercise, but detailed comparisons have not yet been made. Therefore, the purpose of this mini review is to assess the similarities and distinctions between adaptations to passive heating and exercise. Understanding the potential shared mechanisms of action between passive heating and exercise may help to direct future studies to implement passive heating more effectively and identify differences between passive heating and exercise-induced adaptations.

Published
2020

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