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Peos JJ, Norton LE, Helms ER, Galpin AJ, Fournier P. Intermittent Dieting: Theoretical Considerations for the Athlete. Sports (Basel) 2019; 7:sports7010022. [PMID: 30654501 PMCID: PMC6359485 DOI: 10.3390/sports7010022] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 01/05/2019] [Accepted: 01/11/2019] [Indexed: 12/28/2022] Open
Abstract
Athletes utilise numerous strategies to reduce body weight or body fat prior to competition. The traditional approach requires continuous energy restriction (CER) for the entire weight loss phase (typically days to weeks). However, there is some suggestion that intermittent energy restriction (IER), which involves alternating periods of energy restriction with periods of greater energy intake (referred to as ‘refeeds’ or ‘diet breaks’) may result in superior weight loss outcomes than CER. This may be due to refeed periods causing transitory restoration of energy balance. Some studies indicate that intermittent periods of energy balance during energy restriction attenuate some of the adaptive responses that resist the continuation of weight and fat loss. While IER—like CER—is known to effectively reduce body fat in non-athletes, evidence for effectiveness of IER in athletic populations is lacking. This review provides theoretical considerations for successful body composition adjustment using IER, with discussion of how the limited existing evidence can be cautiously applied in athlete practice.
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Affiliation(s)
- Jackson James Peos
- The University of Western Australia (UWA), The School of Human Sciences, Crawley Campus, WA 6009, USA.
| | | | - Eric Russell Helms
- Auckland University of Technology, Sports Performance Institute New Zealand (SPRINZ) at AUT Millennium, Auckland 0632, New Zealand.
| | - Andrew Jacob Galpin
- California State University, Biochemistry and Molecular Exercise Physiology Laboratory, Centre for Sport Performance, Fullerton, CA 92831, USA.
| | - Paul Fournier
- The University of Western Australia (UWA), The School of Human Sciences, Crawley Campus, WA 6009, USA.
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Pearce J, Norton LE, Senchina DS, Spriet LL, Burke LM, Stear SJ, Castell LM. A–Z of nutritional supplements: dietary supplements, sports nutrition foods and ergogenic aids for health and performance—Part 37. Br J Sports Med 2012. [DOI: 10.1136/bjsports-2012-091626] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Ovakim D, Bosma KJ, Young GB, Sen M, Norton LE, Priestap F, Tirona RG, Kim R, Dresser GK. Effect of critical illness on the pharmacokinetics and dose-response relationship of midazolam. Crit Care 2012. [PMCID: PMC3363748 DOI: 10.1186/cc10937] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Norton LE, Layman DK, Wilson GJ, Moulton C, Rupassara SI, Garlick PJ. Leucine contents of isonitrogenous protein sources predict changes in body composition and muscle mass in rats. FASEB J 2010. [DOI: 10.1096/fasebj.24.1_supplement.97.5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | - Gabriel J Wilson
- Food Science and Human Nutrition
- Department of Animal SciencesUniversity of IllinoisUrbanaIL
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Norton LE, Wilson GJ, Rupassara I, Garlick PJ, Layman DK. Leucine contents of isonitrogenous protein sources predict post prandial skeletal muscle protein synthesis in rats fed a complete meal. FASEB J 2009. [DOI: 10.1096/fasebj.23.1_supplement.227.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Norton LE, Rupassar I, Layman DK, Garlick PJ. Isonitrogenous protein sources with different leucine contents differentially effect translation initiation and protein synthesis in skeletal muscle. FASEB J 2008. [DOI: 10.1096/fasebj.22.1_supplement.869.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Norton LE, Layman DK, Garlick P, Brana D, Anthony TG, Zhao L, Devkota S, Walker D. Translational controls of muscle protein synthesis are delayed and prolonged associated with ingestion of a complete meal. FASEB J 2007. [DOI: 10.1096/fasebj.21.5.a714-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Layne Eiseman Norton
- Food Science and Human NutritionUniversity of IllinoisBevier Hall Room 430, 905 S. Goodwin AveUrbanaIL61801
| | - Donald K Layman
- Food Science and Human NutritionUniversity of IllinoisBevier Hall Room 430, 905 S. Goodwin AveUrbanaIL61801
| | - Peter Garlick
- Animal SciencesUniversity of Illinois, 432 Animal Sciences Laboratory1207 West Gregory DriveUrbanaIL61801
| | - Diego Brana
- Animal SciencesUniversity of Illinois, 432 Animal Sciences Laboratory1207 West Gregory DriveUrbanaIL61801
| | - Tracy G Anthony
- Biochemistry and Molecular BiologyIndiana University School of Medicine ‐ Evansville, 8600 University BoulevardEvansvilleIN47712
| | - Liying Zhao
- Animal SciencesUniversity of Illinois, 432 Animal Sciences Laboratory1207 West Gregory DriveUrbanaIL61801
| | - Suzanne Devkota
- Food Science and Human NutritionUniversity of IllinoisBevier Hall Room 430, 905 S. Goodwin AveUrbanaIL61801
| | - Dee Walker
- Food Science and Human NutritionUniversity of IllinoisBevier Hall Room 430, 905 S. Goodwin AveUrbanaIL61801
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Norton LE, Malloy PF, Salloway S. The impact of behavioral symptoms on activities of daily living in patients with dementia. Am J Geriatr Psychiatry 2001; 9:41-8. [PMID: 11156751] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
The authors examined whether scores on two recently developed measures of behavioral disturbance, the Frontal Lobe Personality Scale (FLOPS) and the Neuropsychiatric Inventory (NPI), are associated with functional impairments in patients with dementia. Caregivers of 30 dementia patients were administered the FLOPS Family Form, the NPI, and an Activities of Daily Living (ADL) scale. Findings indicated a relationship between behavioral changes and functional limitations in patients with dementia. Moreover, the FLOPS, an instrument designed to specifically measure behaviors subserved by frontal lobe systems, was more strongly related to failures in instrumental ADLs than was the NPI. The authors conclude that behavioral measures add information over and above that available from cognitive tests in determining ADL functioning.
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Affiliation(s)
- L E Norton
- Butler Hospital, Brown University School of Medicine, Providence, RI, USA
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Abstract
Studies examining implicit memory performance in Alzheimer's disease (AD) have yielded inconsistent findings, with these patients demonstrating impaired performance within some priming studies and intact performance within others. The present study examined the role of task sensitivity in detecting impaired priming in memory-impaired patients. Twelve healthy older adults and 12 AD patients were administered a picture fragment identification test. Task sensitivity was increased by employing stimulus cues expected to produce larger and more variable priming effects than obtained in previous studies. A simple comparison of priming scores revealed that the AD patients demonstrated significantly impaired priming relative to normal control participants. However, further analysis of priming in relation to certain stimulus characteristics revealed that AD patients often demonstrated impaired priming when overall priming effects were large but relatively intact priming when priming effects were small. These findings suggest that the prevention of ceiling effects in control participants may aid in the detection of impaired priming in patient populations.
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Affiliation(s)
- L E Norton
- Department of Psychiatry, University of California, San Diego, USA.
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Norton LE, Bondi MW, Salmon DP, Goodglass H. Deterioration of generic knowledge in patients with Alzheimer's disease: evidence from the Number Information Test. J Clin Exp Neuropsychol 1997; 19:857-66. [PMID: 9524880 DOI: 10.1080/01688639708403766] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [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: 02/06/2023]
Abstract
Semantic memory for generic knowledge was assessed in patients with probable Alzheimer's disease (AD; n = 142) and elderly normal control (NC; n = 78) subjects using the Number Information Test (NIT), a test that consists of 24 general knowledge questions that require a single number for an answer (e.g., "How many days are in a year?"). The results showed that patients with AD were impaired, even in the mildest stage of dementia, and that this impairment grew as the severity of their dementia increased over time. In addition, patients with AD were highly consistent in the individual items they missed in subsequent test sessions conducted 1 or 2 years later. These results indicate that semantic memory for generic knowledge is impaired relatively early in AD, deteriorates throughout the course of the disease, and may be due to a loss of knowledge rather than to a retrieval deficit.
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Affiliation(s)
- L E Norton
- Department of Psychiatry, University of California, San Diego 92093-0948, USA
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Garriott JC, Rodriquez R, Norton LE. Two cases of death involving dicyclomine in infants. Measurement of therapeutic and toxic concentrations in blood. J Toxicol Clin Toxicol 1984; 22:455-62. [PMID: 6530703 DOI: 10.3109/15563658408992576] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
In two deaths of infants investigated by the Medical Examiner, high levels of dicyclomine were detected in blood. In one of the cases, a level of 0.505 micrograms/ml was found, nearly 10 times reported adult therapeutic blood concentrations, and death was ascribed to an overdose of dicyclomine. Gas chromatography/mass spectrometry was used for the analysis of biological specimens.
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Norton LE. Child abuse. Clin Lab Med 1983; 3:321-42. [PMID: 6617120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Abstract
A relatively simple and rapid test for detection of the components of Cannabis sativa (marihuana) after smoking consists of swabbing the exposed areas with an alcohol-containing swab, then concentrating the extract from the swab for direct analysis by Gas Chromatography-Mass Spectrometry. This test is now performed in several medical examiner's offices. This study was performed to evaluate this test using volunteer marihuana-smoking subjects. Caution must be used in interpreting the results obtained because of the transient nature of the intoxication, and because of the possibility of obtaining false-positive results. The time response and other parameters concerning the procedure are also discussed.
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Wilson M, Raney M, Norton LE. Myths about women: medicine's nostalgic view. J Med Assoc State Ala 1982; 51:37-39. [PMID: 7108399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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Norton LE, Garriott JC, DiMaio VJ. Drug detection at autopsy: a prospective study of 247 cases. J Forensic Sci 1982; 27:66-71. [PMID: 7097197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Comprehensive toxicology analyses using gas chromatography of blood for alcohol and acidic, basic, and neutral drugs were performed on 247 randomly selected medical examiner cases. Drugs or alcohol or both were found in 54% of this group. When considered by manner of death (natural, accident, homicide, and suicide), each of the groups had incidences of positive findings of 46 to 63%. Selection of cases for toxicologic study on the basis of manner of death does not seem to be feasible. It is the authors' opinion that comprehensive toxicology evaluation for drugs should be done on virtually all medical examiner cases. This approach ensures a thorough and complete evaluation in all cases. In addition, a comprehensive toxicology study will provide information in the event that questions concerning the absence or presence of drugs arise at some later date.
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Yadlowski JM, Tu AT, Garriott JC, Norton LE. Suicide by snake venom injection. J Forensic Sci 1980; 25:760-4. [PMID: 7430990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A case of apparent suicide by injection of snake venom was investigated. Evidence found at the scene and presumably used for self-injection was positive for nonspecific venom but had the characteristics of a viper venom.
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Norton LE, DiMaio VJ, Zumwalt RE. Spontaneous pneumothorax in the newborn: a report of two fatalities. J Forensic Sci 1978; 23:508-10. [PMID: 744980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Spontaneous pneumothorax is present in 1 to 2% of healthy full-term newborn infants. Virtually all cases have resolution of the pneumothorax without sequelae and in fact without the condition being diagnosed. Two fatal cases are presented. Anyone doing medicolegal autopsies should be aware of this entity so that X-rays or other appropriate methods to demonstrate it can be used.
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