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Liu J, Ito S, Ngo TM, Lawate A, Ong QC, Fox TE, Chang SY, Phung D, Nair E, Palaiyan M, Joty S, Abisheganaden J, Lee CP, Lwin MO, Theng YL, Ho MHR, Chia M, Bojic I, Car J. A pilot randomised controlled trial exploring the feasibility and efficacy of a human-AI sleep coaching model for improving sleep among university students. Digit Health 2024; 10:20552076241241244. [PMID: 38638406 PMCID: PMC11025445 DOI: 10.1177/20552076241241244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/05/2024] [Indexed: 04/20/2024] Open
Abstract
Objective Sleep quality is a crucial concern, particularly among youth. The integration of health coaching with question-answering (QA) systems presents the potential to foster behavioural changes and enhance health outcomes. This study proposes a novel human-AI sleep coaching model, combining health coaching by peers and a QA system, and assesses its feasibility and efficacy in improving university students' sleep quality. Methods In a four-week unblinded pilot randomised controlled trial, 59 university students (mean age: 21.9; 64% males) were randomly assigned to the intervention (health coaching and QA system; n = 30) or the control conditions (QA system; n = 29). Outcomes included efficacy of the intervention on sleep quality (Pittsburgh Sleep Quality Index; PSQI), objective and self-reported sleep measures (obtained from Fitbit and sleep diaries) and feasibility of the study procedures and the intervention. Results Analysis revealed no significant differences in sleep quality (PSQI) between intervention and control groups (adjusted mean difference = -0.51, 95% CI: [-1.55-0.77], p = 0.40). The intervention group demonstrated significant improvements in Fitbit measures of total sleep time (adjusted mean difference = 32.5, 95% CI: [5.9-59.1], p = 0.02) and time in bed (adjusted mean difference = 32.3, 95% CI: [2.7-61.9], p = 0.03) compared to the control group, although other sleep measures were insignificant. Adherence was high, with the majority of the intervention group attending all health coaching sessions. Most participants completed baseline and post-intervention self-report measures, all diary entries, and consistently wore Fitbits during sleep. Conclusions The proposed model showed improvements in specific sleep measures for university students and the feasibility of the study procedures and intervention. Future research may extend the intervention period to see substantive sleep quality improvements.
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Affiliation(s)
- Jintana Liu
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Sakura Ito
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Tra My Ngo
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Ashwini Lawate
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Qi Chwen Ong
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Tatiana Erlikh Fox
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Si Yuan Chang
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Duy Phung
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | | | - Malar Palaiyan
- University Counselling Centre, Nanyang Technological University, Singapore, Singapore
| | - Shafiq Joty
- Salesforce AI Research, San Francisco, CA, USA
- School of Computer Science and Engineering, Nanyang Technological University, Singapore, Singapore
| | - John Abisheganaden
- Department of Respiratory and Critical Care Medicine, Tan Tock Seng Hospital, Singapore, Singapore
| | - Chuen Peng Lee
- Department of Respiratory and Critical Care Medicine, Tan Tock Seng Hospital, Singapore, Singapore
| | - May Oo Lwin
- Wee Kim Wee School of Communication and Information, Nanyang Technological University, Singapore, Singapore
| | - Yin Leng Theng
- Wee Kim Wee School of Communication and Information, Nanyang Technological University, Singapore, Singapore
| | - Moon-Ho Ringo Ho
- School of Social Sciences, Nanyang Technological University, Singapore, Singapore
| | - Michael Chia
- Physical Education and Sports Science, National Institute of Education, Nanyang Technological University, Singapore, Singapore
| | - Iva Bojic
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Josip Car
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
- School of Life Course & Population Sciences, King's College London, London, UK
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Eysenbach G, Wark PA, Mastellos N, Neves AL, Gallagher J, Majeed A, Webster A, Smith A, Choo-Kang B, Leon C, Edwards C, O'Shea C, Heitz E, Kayode OV, Nash M, Kowalski M, Jiwani M, O'Callaghan ME, Zary N, Henderson N, Chavannes NH, Čivljak R, Olubiyi OA, Mahapatra P, Panday RN, Oriji SO, Fox TE, Faint V, Car J. Assessment of Clinical Information Quality in Digital Health Technologies: International eDelphi Study. J Med Internet Res 2022; 24:e41889. [PMID: 36472901 PMCID: PMC9768639 DOI: 10.2196/41889] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 10/29/2022] [Accepted: 11/17/2022] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Digital health technologies (DHTs), such as electronic health records and prescribing systems, are transforming health care delivery around the world. The quality of information in DHTs is key to the quality and safety of care. We developed a novel clinical information quality (CLIQ) framework to assess the quality of clinical information in DHTs. OBJECTIVE This study explored clinicians' perspectives on the relevance, definition, and assessment of information quality dimensions in the CLIQ framework. METHODS We used a systematic and iterative eDelphi approach to engage clinicians who had information governance roles or personal interest in information governance; the clinicians were recruited through purposive and snowball sampling techniques. Data were collected using semistructured online questionnaires until consensus was reached on the information quality dimensions in the CLIQ framework. Responses on the relevance of the dimensions were summarized to inform decisions on retention of the dimensions according to prespecified rules. Thematic analysis of the free-text responses was used to revise definitions and the assessment of dimensions. RESULTS Thirty-five clinicians from 10 countries participated in the study, which was concluded after the second round. Consensus was reached on all dimensions and categories in the CLIQ framework: informativeness (accuracy, completeness, interpretability, plausibility, provenance, and relevance), availability (accessibility, portability, security, and timeliness), and usability (conformance, consistency, and maintainability). A new dimension, searchability, was introduced in the availability category to account for the ease of finding needed information in the DHTs. Certain dimensions were renamed, and some definitions were rephrased to improve clarity. CONCLUSIONS The CLIQ framework reached a high expert consensus and clarity of language relating to the information quality dimensions. The framework can be used by health care managers and institutions as a pragmatic tool for identifying and forestalling information quality problems that could compromise patient safety and quality of care. INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID) RR2-10.1136/bmjopen-2021-057430.
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Affiliation(s)
| | - Petra A Wark
- Department of Primary Care and Public Health, Imperial College London, London, United Kingdom.,Centre for Intelligent Healthcare, Institute for Health and Wellbeing, Coventry University, Coventry, United Kingdom
| | - Nikolaos Mastellos
- Department of Primary Care and Public Health, Imperial College London, London, United Kingdom
| | - Ana Luisa Neves
- Department of Primary Care and Public Health, Imperial College London, London, United Kingdom
| | - Joseph Gallagher
- gHealth Research Group, School of Medicine, University College Dublin, Dublin, Ireland
| | - Azeem Majeed
- Department of Primary Care and Public Health, Imperial College London, London, United Kingdom
| | - Andrew Webster
- Leeds Teaching Hospital National Health Service Trust, Leeds, United Kingdom
| | - Anthony Smith
- Health Board, Hywel Dda University, Wales, United Kingdom
| | - Brian Choo-Kang
- Glasgow Royal Infirmary, National Health Service Greater Glasgow and Clyde, Glasgow, United Kingdom
| | - Catherine Leon
- Oxford University National Health Service Foundation Trusts, Oxford, United Kingdom
| | | | - Conor O'Shea
- Wheaton Hall Medical Practice, Drogheda, Co Louth, Ireland
| | | | | | - Makeba Nash
- Croydon Health Services, Croydon, United Kingdom
| | - Martin Kowalski
- Department of Ophthalmology, University Eye Hospital Tübingen, Tübingen, Germany
| | - Mateen Jiwani
- Department of Primary Care and Public Health, Imperial College London, London, United Kingdom
| | | | - Nabil Zary
- Institute for Excellence in Health Professions Education, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates
| | | | - Niels H Chavannes
- National eHealth Living Lab, Department of Public Health and Primary Care, Leiden University Medical Center, Leiden, Netherlands
| | - Rok Čivljak
- University Hospital for Infectious Diseases, Zagreb, Croatia.,University of Zagreb School of Medicine, Zagreb, Croatia
| | - Olubunmi Abiola Olubiyi
- Medical Research Council Unit The Gambia, London School of Hygiene & Tropical Medicine, Fajara, Gambia
| | - Piyush Mahapatra
- West Hertfordshire Teaching Hospitals National Health Service Trust, Watford, United Kingdom
| | - Rishi Nannan Panday
- Acute Medicine Section, Department of Internal Medicine, Amsterdam University Medical Centers, VU Medical Center Location, Amsterdam, Netherlands
| | - Sunday O Oriji
- Department of Mental Health, Nnewi Campus, Nnamdi Azikiwe University Teaching Hospital, Nnewi, Nigeria
| | - Tatiana Erlikh Fox
- Centre for Population Health Sciences, Lee Kong Chian Medicine, Nanyang Technological University, Singapore, Singapore
| | - Victoria Faint
- Leeds Teaching Hospital National Health Service Trust, Leeds, United Kingdom
| | - Josip Car
- Department of Primary Care and Public Health, Imperial College London, London, United Kingdom.,Centre for Population Health Sciences, Lee Kong Chian Medicine, Nanyang Technological University, Singapore, Singapore
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3
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Tudor Car L, Kyaw BM, Teo A, Fox TE, Vimalesvaran S, Apfelbacher C, Kemp S, Chavannes N. Outcomes, Measurement Instruments, and Their Validity Evidence in Randomized Controlled Trials on Virtual, Augmented, and Mixed Reality in Undergraduate Medical Education: Systematic Mapping Review. JMIR Serious Games 2022; 10:e29594. [PMID: 35416789 PMCID: PMC9047880 DOI: 10.2196/29594] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 09/20/2021] [Accepted: 12/15/2021] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Extended reality, which encompasses virtual reality (VR), augmented reality (AR), and mixed reality (MR), is increasingly used in medical education. Studies assessing the effectiveness of these new educational modalities should measure relevant outcomes using outcome measurement tools with validity evidence. OBJECTIVE Our aim is to determine the choice of outcomes, measurement instruments, and the use of measurement instruments with validity evidence in randomized controlled trials (RCTs) on the effectiveness of VR, AR, and MR in medical student education. METHODS We conducted a systematic mapping review. We searched 7 major bibliographic databases from January 1990 to April 2020, and 2 reviewers screened the citations and extracted data independently from the included studies. We report our findings in line with the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines. RESULTS Of the 126 retrieved RCTs, 115 (91.3%) were on VR and 11 (8.7%) were on AR. No RCT on MR in medical student education was found. Of the 115 studies on VR, 64 (55.6%) were on VR simulators, 30 (26.1%) on screen-based VR, 9 (7.8%) on VR patient simulations, and 12 (10.4%) on VR serious games. Most studies reported only a single outcome and immediate postintervention assessment data. Skills outcome was the most common outcome reported in studies on VR simulators (97%), VR patient simulations (100%), and AR (73%). Knowledge was the most common outcome reported in studies on screen-based VR (80%) and VR serious games (58%). Less common outcomes included participants' attitudes, satisfaction, cognitive or mental load, learning efficacy, engagement or self-efficacy beliefs, emotional state, competency developed, and patient outcomes. At least one form of validity evidence was found in approximately half of the studies on VR simulators (55%), VR patient simulations (56%), VR serious games (58%), and AR (55%) and in a quarter of the studies on screen-based VR (27%). Most studies used assessment methods that were implemented in a nondigital format, such as paper-based written exercises or in-person assessments where examiners observed performance (72%). CONCLUSIONS RCTs on VR and AR in medical education report a restricted range of outcomes, mostly skills and knowledge. The studies largely report immediate postintervention outcome data and use assessment methods that are in a nondigital format. Future RCTs should include a broader set of outcomes, report on the validity evidence of the measurement instruments used, and explore the use of assessments that are implemented digitally.
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Affiliation(s)
- Lorainne Tudor Car
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore.,Department of Primary Care and Public Health, School of Public Health, Imperial College London, London, United Kingdom
| | - Bhone Myint Kyaw
- Centre for Population Health Sciences, Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Andrew Teo
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Tatiana Erlikh Fox
- Centre for Population Health Sciences, Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore.,Department of Internal Medicine, Onze Lieve Vrouwen Gasthuis, Amsterdam, Netherlands
| | - Sunitha Vimalesvaran
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Christian Apfelbacher
- Institute of Social Medicine and Health Systems Research, Otto von Guericke University Magdeburg, Magdegurg, Germany.,Family Medicine and Primary Care, Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Sandra Kemp
- Faculty of Health Sciences, Curtin Medical School, Curtin University, Bentley, Australia
| | - Niels Chavannes
- Department of Public Health and Primary Care, Leiden University Medical Centre, Leiden, Netherlands
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4
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Abstract
The era of sphingolipid-based therapeutics is upon us. A large body of work has been accumulating that demonstrates the distinct biological roles of sphingolipids in maintaining a homeostatic environment and in responding to environmental stimuli to regulate cellular processes. It is thus necessary to further investigate alterations in sphingolipid-metabolism in pathological conditions and, in turn, try to exploit altered sphingolipid-metabolizing enzymes and their metabolites as therapeutic targets. This review will examine how advances in the fields of drug delivery, drug discovery, synthetic chemistry, enzyme replacement therapy, immunobiology, infectious disease and nanotechnology have delivered the potential and promise of utilizing and/or targeting sphingolipid metabolites as therapies for diverse diseases.
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Affiliation(s)
- T E Fox
- Department of Pharmacology, Penn State College of Medicine, Hershey, Pennsylvania 17033, USA
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5
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Abstract
OBJECTIVE To evaluate whether a compartmental model could estimate iron absorption as accurately as the well-validated technique of plasma area under the curve using labelled test meals. DESIGN The study is a randomised cross-sectional intervention. SETTING The study was carried out at the Human Nutrition Unit at the Institute of Food Research, Norwich, UK. SUBJECTS A total of nine female volunteers, aged 33+/-8 y. INTERVENTIONS Volunteers were given an oral dose (approximately 5 mg) of Fe-57 as iron sulphate in an orange juice test drink and simultaneously infused Fe-58 (approximately 200 microg) as iron citrate over 90 min. Multiple blood samples were taken for the following 6 h. The samples were analysed by mass spectrometry and iron absorption was estimated using a mathematical model based on the appearance of Fe isotopes in plasma and the area under the curve technique. RESULTS The geometric mean (-1 s.d., +1 s.d.) absorption of the model estimate is 16% (9, 31) and the area under curve estimate is 18% (8, 29). CONCLUSIONS Results indicate that a compartmental model can be used to estimate labelled iron absorption although it is unlikely that this new method will be used in favour of an existing one. Further studies are now needed with unlabelled iron to assess whether the technique could have application in the assessment of total (haem+nonhaem) iron absorption from food.
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Affiliation(s)
- B Sarria
- Instituto del Frío, Consejo Superior de Investigaciones Científicas, Madrid, Spain
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6
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Fox TE, Van den Heuvel EGHM, Atherton CA, Dainty JR, Lewis DJ, Langford NJ, Crews HM, Luten JB, Lorentzen M, Sieling FW, van Aken-Schneyder P, Hoek M, Kotterman MJJ, van Dael P, Fairweather-Tait SJ. Bioavailability of selenium from fish, yeast and selenate: a comparative study in humans using stable isotopes. Eur J Clin Nutr 2004; 58:343-9. [PMID: 14749756 DOI: 10.1038/sj.ejcn.1601787] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE To measure the bioavailability of selenium from cooked and raw fish in humans by estimating and comparing apparent absorption and retention of selenium in biosynthetically labelled fish with labelled selenate and biosynthetically labelled selenium in brewers yeast. DESIGN The intervention study was a parallel, randomised, reference substance controlled design carried out at two different centres in Europe. SETTING The human study was carried out at the Institute of Food Research, Norwich, UK and at TNO Nutrition and Food Research, Zeist, The Netherlands. SUBJECTS In all, 35 male volunteers aged 18-50 y were recruited; 17 subjects were studied in Norwich (UK) and 18 in Zeist (Netherlands). All of the recruited subjects completed the study. INTERVENTIONS Biosynthetically labelled trout fish (processed by two different methods), biosynthetically labelled brewers yeast and isotopically labelled selenate were used to estimate selenium apparent absorption and retention by quantitative analysis of stable isotope labels recovered in faeces and urine. Subjects consumed the labelled foods in four meals over two consecutive days and absorption was measured by the luminal disappearance method over 10 days. Urinary clearance of isotopic labels was measured over 7 days to enable retention to be calculated. RESULTS Apparent absorption of selenium from fish was similar to selenate and there was no difference between the two processing methods used. However, retention of fish selenium was significantly higher than selenate (P<0.001). Apparent absorption and retention of yeast selenium was significantly different (P<0.001) from both fish selenium and selenate. CONCLUSION Fish selenium is a highly bioavailable source of dietary selenium. Cooking did not affect selenium apparent absorption or retention from fish. Selenium from yeast is less bioavailable.
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Affiliation(s)
- T E Fox
- Institute of Food Research, Colney, Norwich, UK
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7
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Crews HM, Owen LM, Langford N, Fairweather-Tait SJ, Fox TE, Hubbard L, Phillips D. Use of the stable isotope (106)Cd for studying dietary cadmium absorption in humans. Toxicol Lett 2000; 112-113:201-7. [PMID: 10720732 DOI: 10.1016/s0378-4274(99)00284-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Hydroponically grown wheat was intrinsically labelled with the stable isotope 106cadmium (106Cd) and the flour made into a porridge. The abundance of the isotope in the porridge was approximately 30 times the natural abundance, but the total level of Cd in the porridge was 0.03 mg/kg fresh weight, which was the same as expected in a normal diet. Cadmium measurements were made using inductively coupled plasma-mass spectrometry (ICP-MS). The porridge was eaten at breakfast by adult and infant volunteers. Bulked faecal collections were analysed for unabsorbed Cd. Initial results suggest that the apparent absorption of Cd may be higher than 5% as commonly quoted, but longer faecal collection times may be necessary to confirm this.
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Affiliation(s)
- H M Crews
- Central Science Laboratory, Sand Hutton, York, UK.
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8
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Abstract
The bioavailability of iron glycine added to a vegetable infant weaning food was compared with ferrous sulfate. Stable, isotopically labeled compounds (57Fe or 58Fe) were mixed into the midday meal (1.4 mg added Fe/serving) and fed to 9-mo-old infants on alternate days for 8 d. Bioavailability, expressed as a percentage of the dose consumed, was measured from isotopic enrichment of hemoglobin 14 d after the last test meal. There was no difference between iron glycine and ferrous sulfate (x+/-SEM): 9.0+/-0.7% and 9.9+/-0.8%, respectively. The effect of chelation was examined by measuring iron bioavailability of iron glycine and ferrous sulfate added to a high-phytate (310 mg/100 g) whole-grain cereal weaning food and comparing it with a lower-phytate (147 mg/100 g) vegetable food, as used in the first study. Both iron compounds had lower bioavailability from the high-phytate food, 5.2+/-0.5% for iron glycine and 3.8+/-0.9% for ferrous sulfate, than the lower-phytate food, 9.8+/-1.5% for iron glycine and 9.1+/-1.3% for ferrous sulfate. The results showed no significant difference in bioavailability between the two forms of iron when added to infant weaning foods, suggesting that the glycine complex was fully or partially dissociated in the gastrointestinal tract. It is concluded that chelation does not improve the bioavailability of iron in the presence of dietary inhibitors.
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Affiliation(s)
- T E Fox
- Institute of Food Research, Norwich Research Park, Colney, United Kingdom
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9
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Abstract
OBJECTIVES To determine the effects of dietary, physiological or environmental factors on body iron levels in infants aged 4-18 months. DESIGN The daily iron intake of the infants was measured from a diet history obtained by interview using a standardised question sheet, previously validated against weighed intake (minimum 3 days) in an independent sample of 8 and 18 month old infants. Capillary blood samples were analyzed for haemoglobin, mean cell volume, haematocrit, zinc protoporphyrin and plasma ferritin concentration. Ferritin values were log-transformed prior to analysis to give a better approximation to the normal distribution and forward stepwise multiple linear regression was carried out using SPSS. SETTING The city of Norwich, UK and some of its suburbs. SUBJECTS One hundred and eighty-one healthy infants in age groups 4, 8, 12 and 18 months. RESULTS Main determinants of iron stores in the 4 month old infants were birth weight (+ve (P < 0.001)) and body weight (-ve (P < 0.005)). In the 8 month old infants intake of cow's milk (-ve (P < 0.05)), belonging to a smoking household (-ve (P < 0.05)) and quantity of commercial babyfood consumed (+ve (P < 0.05)) were significant. In this age group there was a gender effect (girls > boys (P < 0.01)) and the gender effect remained at 12 months (girls > boys (P < 0.05)), but at 18 months only non-haem iron intake was a significant factor (-ve (P < 0.05)). CONCLUSIONS At 4 months of age birth weight and body weight exert the greatest influence on iron stores, whereas by 8 months components of the weaning diet have an effect (commercial babyfood (+ve), cow's milk (-ve)); there is also a gender effect (girls > boys), possibly reflecting the different growth rate between boys and girls. At 12 and 18 months the only significant factors are gender (girls > boys) and non-haem iron intake (-ve) respectively.
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Affiliation(s)
- S G Wharf
- Institute of Food Research, Norwich Research Park, Colney, Norwich, NR4 7UA, Norfolk, UK
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10
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Abstract
The effect of fortification iron (reduced iron) on zinc absorption from a commercial vegetable-based weaning food was assessed in 11 9-mo-old infants. Each infant was fed a test meal of unfortified or iron-fortified product, labeled extrinsically with 1 mg 67Zn or 70Zn (as citrate), and the next day was fed the second product labeled with the other isotope. A complete fecal collection was carried out for 3-4 d, and the amount of unabsorbed isotope measured by thermal-ionization quadrupole mass spectrometry. Apparent zinc absorption (isotope intake minus fecal excretion, expressed as the % of dose administered) was 31.1 +/- 8.3% (x +/- SD) from the iron-fortified food and 28.6%28.6 +/- 10.5% from the unfortified food. These values were not significantly different, thus iron fortification of the weaning food did not reduce zinc absorption.
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11
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Boza JJ, Fox TE, Eagles J, Wilson PD, Fairweather-Tait SJ. The validity of extrinsic stable isotopic labeling for mineral absorption studies in rats. J Nutr 1995; 125:1611-6. [PMID: 7782914 DOI: 10.1093/jn/125.6.1611] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The use of extrinsic stable and radioisotopic labels (Fe, Zn, Cu and Se) was compared with the use of intrinsic labels by measuring label retention in rats. Saccharomyces cerevisiae (Hansen strain CBS 1171) was prepared intrinsically enriched with a stable isotope of iron, zinc, copper or selenium, and unenriched freeze-dried yeast was extrinsically labeled with the appropriate stable and/or radioisotope. Male Wistar rats, weighing 80-100 g and fed a purified diet, were given a test meal of one of the above labeled yeasts. Isotopic retention was determined by fecal monitoring. Retention of the stable isotopes was determined by thermal ionization quadruple mass spectrometry (TIQMS) and retention of the radioisotopes by counting feces in a whole-body counter. The results indicated that the behavior of the labels differed among the minerals, with copper as the only one in which the intrinsic and extrinsic stable isotopes were comparably retained. With zinc, retention of the extrinsic radiolabel and intrinsic label was similar, but retention of the extrinsic stable isotope label was higher. With iron, the intrinsic label had a significantly lower retention than the two extrinsic labels; with selenium, retention of all three labels was different, but these differences were not of a sufficient magnitude to conclude that extrinsic stable isotopic labelling is not valid. These results demonstrate that an extrinsic stable isotope label can be used for copper, selenium and inorganic iron, but that such a label is not valid for studies on zinc.
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Affiliation(s)
- J J Boza
- Department of Nutrition Diet and Health, Norwich Laboratory, Norwich Research Park, United Kingdom
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12
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13
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Fox TE, Fairweather-Tait SJ, Eagles J, Wharf SG. Assessment of zinc bioavailability: studies in rats on zinc absorption from wheat using radio- and stable isotopes. Br J Nutr 1994; 71:95-101. [PMID: 8312244 DOI: 10.1079/bjn19940114] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Absorption from wheat intrinsically and extrinsically labelled with 67Zn and extrinsically labelled with 65Zn was measured from 67Zn faecal excretion and 65Zn whole-body retention in rats. There were significant differences between the extrinsically- and intrinsically-labelled 67Zn (P < 0.001), but not between the extrinsically-labelled 65Zn and intrinsically-labelled 67Zn. The effect of chicken meat on the absorption of Zn from intrinsically-labelled wheat was also studied in the rat. Mean Zn absorption from wheat and chicken meat fed separately was 18.5 and 68.2% respectively, and from a mixture of the two containing the same level of Zn was 50.1%. The apparent absorption of Zn from the composite meal was significantly higher than predicted from the results of the foods on their own (P < 0.001).
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Affiliation(s)
- T E Fox
- AFRC Institute of Food Research, Norwich Laboratory, Colney
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14
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Fairweather-Tait SJ, Jackson MJ, Fox TE, Wharf SG, Eagles J, Croghan PC. The measurement of exchangeable pools of zinc using the stable isotope 70Zn. Br J Nutr 1993; 70:221-34. [PMID: 8399104 DOI: 10.1079/bjn19930119] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The present study was designed to assess the feasibility of using small doses of a stable isotope of Zn to follow plasma kinetics over a 10 d period and, hence, make deductions about Zn turnover and body pool sizes. At the beginning of the 10 d metabolic balance, two adults, consuming their habitual diet, were given an intravenous injection of 70Zn. There was a fourfold difference in the administered dose between the two subjects (0.445 and 2.078 mg). Blood samples were taken at regular intervals and plasma enrichment with 70Zn measured by thermal ionization mass spectrometry. Urine and faeces were collected and analysed for Zn and 70Zn. Kinetic analysis of the plasma 70Zn decay by several different methods was undertaken. It was apparent from both deconvolution analysis of the short-term (0-90 min) decay data and four-compartment modelling of the longer-term (0-24 h) data that isotopic Zn very rapidly equilibrates with the plasma Zn and with a rapidly exchanging non-plasma pool, probably located within the liver. This latter pool appears to contain less than 10 mg Zn and the peak of isotope enrichment occurs at about 20 min post injection. The later decay of plasma Zn enrichment appears to be dictated by exchange with a much larger pool of approximate size 350 mg.
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Affiliation(s)
- S J Fairweather-Tait
- AFRC Institute of Food Research, Norwich Laboratory, Norwich Research Park, Colney
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Fairweather-Tait SJ, Fox TE, Wharf SG, Eagles J, Kennedy H. Zinc absorption in adult men from a chicken sandwich made with white or wholemeal bread, measured by a double-label stable-isotope technique. Br J Nutr 1992; 67:411-9. [PMID: 1622981 DOI: 10.1079/bjn19920046] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Eleven fasted adult men consumed a chicken meat sandwich made with white or wholemeal bread, extrinsically labelled with 2 mg 67Zn, on two different occasions. Immediately after eating the sandwich they were given an intravenous injection of 1.5 mg 70Zn. True Zn absorption (which was approximately 7% higher than apparent absorption) was determined by the faecal balance technique by making an allowance for endogenous excretion from measurements of faecal excretion of 70Zn. There was no significant difference in mean true Zn absorption from the white or wholemeal bread sandwich, 33.6 and 25.4% respectively. It was concluded that the substitution of wholemeal for white bread does not reduce Zn absorption from meat-based sandwiches.
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Fairweather-Tait SJ, Fox TE, Wharf SG, Ghani NA. A preliminary study of the bioavailability of iron- and zinc-glycine chelates. Food Addit Contam 1992; 9:97-101. [PMID: 1397394 DOI: 10.1080/02652039209374049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Groups of rats were fed diets containing marginal levels of Fe and Zn as glycine chelates (tradename 'Chelazome', Albion Laboratories, Verona, New Jersey, USA), or the same level of mineral as ferrous sulphate or zinc carbonate. The Fe diets were fed to weanling rats for 4 weeks and the Zn diets to young adult rats for 5 weeks. Blood Hb concentrations were significantly higher in the group fed Fe-chelazome than ferrous sulphate, 149 and 128 g/l respectively (P less than 0.001), but PCV and liver Fe concentrations were similar between the two groups. No difference in plasma Zn, pancreas, testes or femur Zn concentrations were observed between the two Zn groups, indicating that Zn-chelazome has no advantage over zinc carbonate. The results of this preliminary study indicate that Fe-chelazome has a higher bioavailability than ferrous sulphate and merits further study.
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Fairweather-Tait SJ, Fox TE, Wharf SG, Eagles J, Crews HM, Massey R. Apparent zinc absorption by rats from foods labelled intrinsically and extrinsically with 67Zn. Br J Nutr 1991; 66:65-71. [PMID: 1931907 DOI: 10.1079/bjn19910010] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A variety of foods (peas (Pisum sativum), chicken meat, eggs, goat's milk, human milk) enriched with the stable isotope 67Zn were prepared by means of intrinsic- and extrinsic-labelling procedures. They were fed to rats and apparent absorption of 67Zn determined from faecal excretion measurements using thermal ionization mass spectrometry. There were significant differences in the absorption of the extrinsic and intrinsic label which differed in magnitude between the foods tested. The extrinsic 67Zn was less well absorbed in peas, chicken meat, eggs, and human milk than intrinsic 67Zn, but in goat's milk the extrinsic 67Zn was better absorbed than the intrinsic label. These results demonstrate that extrinsically-added stable Zn isotopes do not fully exchange with endogenous Zn in many foods, and illustrate the need for caution when using extrinsic labels for Zn bioavailability studies.
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Fox TE, Fairweather-Tait SJ, Eagles J, Wharf SG. Intrinsic labelling of different foods with stable isotope of zinc (67Zn) for use in bioavailability studies. Br J Nutr 1991; 66:57-63. [PMID: 1931906 DOI: 10.1079/bjn19910009] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Intrinsically-labelled foods are required to validate extrinsic-labelling techniques used to study the bioavailability of trace elements. Wheat (Triticum aestivum), peas (Pisum sativum), goat's milk, human milk, eggs and chicken meat were selected for intrinsic-labelling studies with 67Zn. Peas were grown hydroponically in enriched nutrient solution and wheat was grown in sand and watered with enriched nutrient solution. Some of the wheat plants were also given stem injections of 67Zn solution. Eggs and chicken meat were prepared by administering 67Zn intravenously to chickens, and human milk was collected after an oral dose of 67Zn in a cola drink. All the foods investigated were sufficiently enriched with 67Zn for Zn absorption studies except wheat prepared by the sand and water-culture method.
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Affiliation(s)
- T E Fox
- FRC Institute of Food Research, Norwich Laboratory
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Miller GJ, Cruickshank JK, Ellis LJ, Thompson RL, Wilkes HC, Stirling Y, Mitropoulos KA, Allison JV, Fox TE, Walker AO. Fat consumption and factor VII coagulant activity in middle-aged men. An association between a dietary and thrombogenic coronary risk factor. Atherosclerosis 1989; 78:19-24. [PMID: 2757683 DOI: 10.1016/0021-9150(89)90154-8] [Citation(s) in RCA: 81] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Diet was measured by 5-day weighed inventory to search for an association between fat intake in the general population and factor VII coagulant activity (VIIc), a strong predictor of coronary heart disease. Of 275 men aged 40-59 years registered with a medical practice, 203 (74%) participated and 170 (62%) provided a satisfactory record. After allowance for the increase in fat intake with body size, a statistically significant and positive association was found between dietary fat and VIIc (r = 0.18; P less than 0.05). The correlation coefficient was increased to 0.24 when adjusted for the effect of day-to-day variability in individual fat intake, thereby providing an improved estimate of the true strength of association. The mean difference in VIIc of 12% of standard between men in the highest and lowest quarters of the distribution of fat intake was similar to that reported between men experiencing coronary heart disease and those remaining free. The results support previous experimental fat-feeding studies and suggest that a high fat diet has adverse consequences for blood coagulability and coronary thrombosis.
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Affiliation(s)
- G J Miller
- MRC Epidemiology, Northwick Park Hospital, Harrow, Middlesex, U.K
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Thompson RL, Cruickshank JK, Ellis LJ, Walker AO, Fox TE, Miller GJ. Dietary intake of men in Wembley, London, by weighed inventory: comparison with national recommendations, with particular emphasis on fat intake. Eur J Clin Nutr 1989; 43:245-51. [PMID: 2661217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
To assess the extent to which current dietary habits conform with the national nutritional guidelines aimed at reducing the high national mortality from coronary heart disease (CHD), 203 of 275 men (74 per cent) aged 40-59 years in a London community provided a weighed record of all food and drink consumed over 5 d. Satisfactory records were returned by 170 men weighing at least 75 per cent of their intakes, including 43 on medical or self-imposed diets. Mean (s.d.) energy intake was 2476 (590) kcal (10.38 MJ), comprising 37 per cent fat, 42 per cent carbohydrate, 14.7 per cent protein and 6.3 per cent alcohol. Butter or butter spreads were used by 53 per cent, sunflower margarine by 29 per cent and low fat spreads by 13 per cent; lard or dripping was used by 23 per cent of households as the main cooking fat. Intakes of vitamins and trace elements were generally above recommended amounts. These results are closely comparable with the only similar studies for the UK undertaken in Wales and Scotland. Compared with national guidelines, only 32 per cent of men met the short-term goals for fat intake, and even fewer the long-term goals. Carbohydrate and fibre intake remained too low. Alcohol intake exceeded the short-term goal (5 per cent of energy of less) in 36 per cent of men. Greater public health effort will be needed to reduce fat intake further for primary prevention of CHD, particularly as habitual intake is probably underestimated by the weighed dietary record.
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Affiliation(s)
- R L Thompson
- MRC Epidemiology, Northwick Park Hospital, Harrow, Middlesex, UK
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