Julia K. Zakrzewski-Fruer

ORCID: 0000-0003-4167-4100
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About
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Research Areas
  • Obesity, Physical Activity, Diet
  • Physical Activity and Health
  • Muscle metabolism and nutrition
  • Cardiovascular and exercise physiology
  • Diet and metabolism studies
  • Health and Lifestyle Studies
  • Eating Disorders and Behaviors
  • Adipose Tissue and Metabolism
  • Grief, Bereavement, and Mental Health
  • Sports Performance and Training
  • Nutritional Studies and Diet
  • Dietary Effects on Health
  • Sleep and related disorders
  • Workplace Health and Well-being
  • Urban Transport and Accessibility
  • Family Support in Illness
  • Diet, Metabolism, and Disease
  • Diabetes, Cardiovascular Risks, and Lipoproteins
  • Early Childhood Education and Development
  • Ergonomics and Musculoskeletal Disorders
  • Pancreatic function and diabetes
  • Musculoskeletal pain and rehabilitation
  • Behavioral Health and Interventions
  • Injury Epidemiology and Prevention
  • Diabetes Management and Research

University of Bedfordshire
2014-2025

Newcastle University
2022

LIDSEN Publishing Inc. (United States)
2022

Newcastle Hospitals - Campus for Ageing and Vitality
2022

Bailey Tool & Manufacturing (United States)
2018

Edwards (United Kingdom)
2018

University of Bath
2012-2017

Loughborough University
2011-2012

Abstract Adolescent girls often skip breakfast due to time constraints and reduced morning appetite. This study examined the acute impact of consumption timing versus omission (BO) on glycaemic insulinaemic responses lunch in infrequent breakfast-consuming girls. Fifteen (13.1±0.8 years) completed three conditions a randomised crossover design: early-morning (EM-BC; 8:30), mid-morning (MM-BC; 10:30), BO. A standardised was provided at 12:30, followed by 2-h post-lunch observation period....

10.1017/s0007114525000248 article EN other-oa British Journal Of Nutrition 2025-02-14

Objective: The aim of this study was to investigate the efficacy a work-based multicomponent intervention reduce office workers' sitting time. Methods: Offices (n = 12; 89 workers) were randomized into an 8-week 48) incorporating organizational, individual, and environmental elements or control arm. Sitting time, physical activity, cardiometabolic health measured at baseline after intervention. Results: Linear mixed modelling revealed no significant change in workplace but changes prolonged...

10.1097/jom.0000000000001366 article EN Journal of Occupational and Environmental Medicine 2018-05-31

Breaking up prolonged sitting can attenuate the postprandial rise in glucose and insulin. Whether such effects are dependent of glycaemic index (GI) consumed carbohydrate is unknown. This study examined acute breaking following a low GI high breakfast on insulin concentrations. Fourteen adult males aged 22.1 ± 1.2 years completed four, 4 h experimental conditions: followed by uninterrupted (HGI-SIT), (LGI-SIT), 2 min activity breaks every 20 (HGI-ACT), (LGI-ACT). Positive incremental area...

10.1007/s00421-017-3610-4 article EN cc-by European Journal of Applied Physiology 2017-05-12

Background: It is estimated that approximately 41,000 children and young people experience the death of a parent each year. Grief responses, such as anxiety depression, can follow. This research investigated adult reflections experiencing parental person. Methods: Semi-structured interviews were conducted with adults (N = 14; female n 8) who experienced person, which occurred over 5 years ago (time since death, M 12.9 years; age at 16.4 interview, 30.9 years). The data analysed inductively...

10.3390/ijerph19042083 article EN International Journal of Environmental Research and Public Health 2022-02-13

Existing research has documented inconsistent findings for the associations among breakfast frequency, physical activity (PA), and sedentary time in children. The primary aim of this study was to examine frequency objectively-measured PA a sample children from 12 countries representing wide range human development, economic development inequality. secondary interactions these between sites.This multinational, cross-sectional included 6228 aged 9-11 years International Study Childhood...

10.1186/s12889-019-6542-6 article EN cc-by BMC Public Health 2019-02-21

It is not known if breakfast consumption an effective intervention for altering daily energy balance in adolescents when compared with omission. This study examined the acute effect of and omission on free-living intake (EI) physical activity (PA) adolescent girls. Using randomised cross-over design, forty girls (age 13·3 (sd 0·8) years, BMI 21·5 5·0) kg/m2) completed two, 3-d conditions a randomised, counter-balanced order: no (NB) standardised (approximately 1962 kJ) (SB). Dietary intakes...

10.1017/s0007114517002148 article EN British Journal Of Nutrition 2017-09-13

Abstract Interrupting prolonged sitting with short multiple bouts of moderate-intensity physical activity (PA) can improve postprandial cardiometabolic risk markers. This study examined the effect high and low frequency PA (matched for total duration energy expenditure) on responses when compared sitting. In this three-condition randomised crossover trial, 14 sedentary, inactive females (33.8±13.4 years, BMI 27.1±6.3 kg/m2) completed 3, 7.5 h conditions: 1) (SIT), 2) high-frequency breaks...

10.1055/a-0997-6650 article EN International Journal of Sports Medicine 2019-09-09

Abstract Background Physical activity benefits physical and mental health. However, limited research investigates if can improve outcomes from the grieving process following death of a parent. Methods Semi-structured interviews were conducted with 14 individuals ( n = 8 female; age M 31.2 years), who had experienced parent when they aged between 10 24 years old, using retrospective recall. Data analysed inductively thematic analysis. Results Six themes identified. was seen as; 1) ‘...

10.1186/s12889-022-14542-6 article EN cc-by BMC Public Health 2023-01-31

The often cited phrase "breakfast is the most important meal of day" may have been largely anecdotal and lacking empirical evidence originally, particularly where children adolescents (young people) are concerned. However, there now a large body demonstrating that regular breakfast consumption associated with variety nutritional lifestyle-related health outcomes in diverse samples young people, which prevent weight gain, nutrient deficiency reduce risk factors for chronic disease. This has...

10.1016/j.jshs.2012.09.001 article EN cc-by-nc-nd Journal of sport and health science/Journal of Sport and Health Science 2012-09-25

This study’s aim was to assess FreeStyle Libre Flash glucose monitoring (FGM) performance during an oral tolerance test (OGTT) and treadmill exercise in healthy adolescents. should advance the feasibility utility of user-friendly technologies for metabolic assessments Seventeen adolescents (nine girls aged 12.8 ± 0.9 years) performed OGTT submaximal maximal tests a laboratory setting. The scanned interstitial fluid concentration ([ISFG]) obtained by FGM compared against finger-prick...

10.3390/s23094249 article EN cc-by Sensors 2023-04-25

Acute exercise can reduce postprandial insulin concentrations and increase fat oxidation in adults, which may have important implications for resistance weight control. However, similar studies with young people or comparing overweight (OW) nonoverweight (NO) individuals are sparse. Therefore, the acute effect of Fatmax on glucose, insulin, was examined 12 OW 15 NO girls.Participants completed two 2-d conditions a counterbalanced order. On day 1, participants either expended 2.09 MJ (500...

10.1249/mss.0b013e31825804cf article EN Medicine & Science in Sports & Exercise 2012-04-22

Consensus on the exercise protocol used to measure Fatmax (exercise intensity corresponding maximum fat oxidation (MFO)) in children has not been reached. The present study compared estimated using 3 min incremental cycling (3-INC) and a consisting of several 10 constant work rate bouts (10-CWR) 26 prepubertal children. Group values were same for 3-INC 10-CWR (55% VO2 peak ) 95% limits agreement (LoA) ± 7% . MFO similar between protocols, although LoA -94 113 mg·min −1 While provides valid...

10.1123/pes.23.1.122 article EN Pediatric Exercise Science 2011-02-01

Abstract This study examined the effect of ambient temperature on energy intake, perceived appetite and gut hormone responses during rest in men. Thirteen men (age 21·5 ( sd 1·4) years; BMI 24·7 2·2) kg/m 2 ) completed three, 5·5 h conditions different temperatures: (i) cold (10°C), (ii) thermoneutral (20°C) (iii) hot (30°C). A standardised breakfast was consumed after fasting measures, an ad libitum lunch provided at 4–4·5 h. Blood samples (analysed for plasma acylated ghrelin, total...

10.1017/s0007114520002792 article EN British Journal Of Nutrition 2020-07-22

With concerns that adolescent girls often skip breakfast, this study compared the effects of breakfast consumption versus omission on free-living physical activity (PA) energy expenditure (PAEE) and dietary intakes among classified as habitual skippers. The participants went through two 7-day conditions in a trial with crossover design: daily standardised (energy content: 25% resting metabolic rate) before 09:00 (BC) (no energy-providing nutrients consumed) until 10:30 (BO). Free-living...

10.3390/nu13124261 article EN Nutrients 2021-11-26
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