Tamara D Hew-Butler

Tamara D Hew-Butler
Wayne State University | WSU · Division of Kinesiology

DPM, PhD, FACSM

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181
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Skills and Expertise

Publications

Publications (181)
Article
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Background: Vitamin D promotes bone and muscle growth in non-athletes, suggesting supplementation may be ergogenic in athletes. Our primary aim was to determine if modest Vitamin D supplementation augments favorable body composition changes (increased bone and lean mass and decreased fat mass) and performance in collegiate basketball players follo...
Article
Full-text available
The COVID-19 pandemic caused significant training disruptions during the 2020–2021 season, due to lockdowns, quarantines, and strict adherence to the pandemic protocols. The main purpose of this study was to determine how the pandemic training restrictions affected training volume and performance in one collegiate swim team. Cumulative training vol...
Article
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Background Sodium supplements are ubiquitous in endurance running, but their impact on performance has been subjected to much debate. The objective of the study was to assess the effect of sodium supplementation as a weight-based predictor of race performance in ultramarathon runners. Methods Prospective observational study during an 80 km (50 mi)...
Preprint
Full-text available
The COVID-19 pandemic caused significant training disruptions during the 2020-21 season due to lockdowns, quarantines, and strict adherence to pandemic protocols. The main purpose of this study was to determine how pandemic training restrictions affected training volume and performance in one collegiate swim team. Cumulative training volume data, a...
Article
Introduction Accurate assessment of total body composition in tall (>1.96m) individuals using dual energy x-ray absorptiometry (DXA) scans is problematic due to current height restrictions of the scan table. The aim of this investigation was to quantify absolute and relative contributions of fat, bone and lean mass, of the feet and head regions, to...
Article
Purpose: Exercise-associated hyponatremia (EAH) is a well-known condition among endurance athletes at low altitudes. The incidence of EAH during ultramarathons at high altitudes warrants further investigation. This prospective observational study was conducted on the participants of the Leadville Trail 100 run, a 161- km race held at a high altitu...
Article
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Physical activity (PA) is beneficial for the health and wellness of individuals and societies. During an infectious disease pandemic, such as the one caused by COVID-19, social distancing, quarantines, and lockdowns are used to reduce community spread of the disease. Unfortunately, such nonpharmacological interventions or physical risk mitigation m...
Article
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The main purpose of this study was to evaluate relationships between depression versus serum 25-hydroxyvitamin D (vitamin D), serum ferritin (ferritin), and fractures across a competitive season. The authors conducted a prospective observational study (both pre-and post-season testing) on 51 collegiate soccer and crosscountry athletes from a Midwes...
Article
The purpose of the current study was to examine the ability of psychosocial constructs and biomarker measures of overtraining and stress to predict athlete burnout, as mediated by training distress, during a 6-week intense training period. Twenty-three females and 17 male NCAA swimmers completed measures, before training (baseline), of athlete iden...
Article
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Adequate serum vitamin D and iron levels are thought to influence physical training adaptations and mood positively. The primary purpose of this prospective, observational study was to investigate relationships between serum 25-OH vitamin D/25(OH)D and serum ferritin levels with body composition and athlete burnout symptoms. Seventy-three collegiat...
Article
Context: Despite growing interest in quantifying and correcting vitamin D inadequacy in basketball players, however, a critical synthesis of these data has yet to be performed to overcome the low generalizability of findings from individual studies. Objective: To provide a comprehensive analysis of data in basketball pertaining to: 1) the prevalenc...
Preprint
Adequate serum vitamin D and iron levels are thought to positively influence physical training adaptations and mood. The purpose of this prospective, observational, study was to investigate relationships between serum 25-OH vitamin D and serum ferritin levels with body composition and athlete burnout symptoms. Seventy-three collegiate athletes (49...
Article
Full-text available
Background: Single-modality, high-intensity interval training (HIIT) using traditional cardiorespiratory exercise selection has been found to provide similar and sometimes superior cardiometabolic effects compared with moderate-intensity continuous training. However, little is known regarding the cardiometabolic and psychosocial effects of HIIT us...
Preprint
Full-text available
Background Vitamin D promotes bone and muscle growth in non-athletes, suggesting supplementation may be ergogenic in athletes. Our primary aim was to determine if modest Vitamin D supplementation augments favorable body composition changes (increased bone and lean mass, decreased fat mass) and performance in collegiate basketball players following...
Article
Full-text available
Introduction The purpose of this study was to describe and examine differences in resting blood pressure (BP) during an eight-week time frame in the course of the competitive season among collegiate swimmers of varied sexes. Methods A prospective observational study using a sample of convenience of National Collegiate Athletic Association (NCAA) Di...
Article
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From Constandt et al.’s survey of 13,515 Belgium respondents, regular physical activity can be successfully initiated and sustained during a lockdown, with appropriate social distancing measures. Documentation that 77% of highly active people and 58% of low active people exercised as much or more following the institution of a nationwide lockdown w...
Article
Full-text available
Introduction The purpose of this study is to describe orthostatic blood pressure (BP) and urine specific gravity (USG) among collegiate athletes and then to examine if correlations between these variables could support use of orthostatic hypotension (OH) measures to screen for dehydration. Methods A prospective observational study was performed usi...
Article
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Exercise-associated hyponatremia (EAH) is defined by a serum or plasma sodium concentration below the normal reference range of 135 mmol·L-1 that occurs during or up to 24 h after prolonged physical activity. It is reported to occur in individual physical activities or during organized endurance events conducted in environments in which medical car...
Article
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Background It remains unclear if ad libitum water drinking, as a hydration strategy, prevents exercise-associated hyponatremia (EAH) during prolonged exercise. The aim of this study was to determine the incidence of EAH within the broader context of fluid regulation among soldiers performing a 40-km route-march ingesting water ad libitum. Methods...
Article
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The detrimental effects of dehydration, to both mental and physical health, are well-described. The potential adverse consequences of overhydration, however, are less understood. The difficulty for most humans to routinely ingest ≥2 liters (L)—or “eight glasses”—of water per day highlights the likely presence of an inhibitory neural circuit which l...
Article
Clinically significant derangements in plasma electrolytes rarely occur outside of excessive exercise and/or extreme dietary habits. Overzealous hydration facilitates exercise-associated disorders of sodium concentration ([Na⁺]) as robust overhydration may induce hyponatremia, whereas severe fluid restriction may cause hypernatremia. Excessive exer...
Article
Apply It! Gain a better understanding of exertional rhabdomyolysis (ER). Understand how ER can affect your clients/athletes, how to identify the signs and symptoms, and most importantly, learn how you can work to prevent it from developing.
Article
Previous studies demonstrated a positive relationship between blood sodium concentration and bone mineral density (BMD) in ultramarathon runners following a 100-mile race (1) and a negative relationship in walkers (treadmill walking for 45-minutes) following an oral sodium load (2). However, accurate assessment of sweat sodium concentration ([Na⁺])...
Article
Background: In 2014, 6 collegiate swimmers were hospitalized for symptomatic exertional rhabdomyolysis. Objective: To serially monitor and assess relationships between skeletal muscle membrane disruption, upper body soreness (UBS) and lower body soreness (LBS), and stress during the first 6 weeks (timepoints) of preseason training in collegiate...
Chapter
Exercise-associated hyponatremia (EAH) refers to below-normal serum sodium concentrations [Na⁺] that develop during exercise. The pathogenesis of EAH is best described as a spectrum ranging between profound polydipsia to modest sweat sodium losses with hypovolemia and relative dilution. Non-osmotic arginine vasopressin (AVP) remains the unifying pa...
Article
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Although traditional high-intensity interval training (HIIT) has been effective in improving body composition and physical fitness, it is unclear how multimodal HIIT affects these variables. This study compared the differences between these two training programs on body composition and physical fitness in apparently healthy, nonobese young adult fe...
Article
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Exercise-associated hyponatraemia (EAH) always involves a component of overhydration relative to available exchangeable sodium stores. In the majority of cases, this is purely due to excessive consumption of fluids during exercise. In a lesser number of cases, it is apparent that excessive sodium loss through sweat may play a role by decreasing the...
Article
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Clinical medicine defines dehydration using blood markers that confirm hypertonicity (serum sodium concentration ([Na⁺])>145 mmol/L) and intracellular dehydration. Sports medicine equates dehydration with a concentrated urine as defined by any urine osmolality (UOsm) ≥700 mOsmol/kgH2O or urine specific gravity (USG) ≥1.020. Objective To compare bl...
Article
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Objectives: To determine whether oral administration of 3% hypertonic saline (HTS) is as efficacious as intravenous (IV) 3% saline in reversing symptoms of mild-to-moderate symptomatic exercise-associated hyponatremia (EAH) in athletes during and after a long-distance triathlon. Design: Noninferiority, open-label, parallel-group, randomized cont...
Article
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Background: Functional and structural asymmetries attributed to limb dominance are equivocal in soccer players. Previous authors hypothesize the existence of between-limb asymmetry secondary to the repetitive unilateral nature of kicking. However, symmetry is often present, particularly in measures of muscle strength. Purpose: The purpose of the...
Article
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Severe exercise-associated hyponatremia (EAH) is largely dilutional, whereas contributions of sodium loss remain equivocal. We present a case of EAH with encephalopathy involving an experienced male cyclist with no recollection of the event. We thereby conducted a retrospective analysis of biochemical trajectories during hospital recovery. The norm...
Article
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Exercise-associated hyponatremia (EAH) was initially described in the 1980s in endurance athletes, and work done since then has conclusively identified that overdrinking beyond thirst and non-osmotic arginine vasopressin release are the most common etiologic factors. In recent years, EAH has been described in a broader variety of athletic events an...
Article
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Objectives: Creatine kinase (CK) is a sensitive enzyme marker for muscle damage in athletes. Elevated CK levels have been reported in many endurance physical activities. The consequence and possible long-term sequela of the CK elevation in athletes is unknown. There is a paucity of literature stating actual numerical values of CK associated with c...
Article
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Every number tells a story. As such, clinical laboratory science empowers modern medicine with a vast yet growing repertoire of analytes, which subsequently guide the diagnosis, treatment and prognosis of most – if not all - medical conditions. The body’s integrated response to dynamic perturbations in homeostasis creates an elusive trail of bioche...
Article
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Hypernatremia is biochemically defined by a blood sodium concentration ([Na+]) above the normal reference range for the laboratory performing the test (typically >145 mmol/L). The clinical relevance of an above normal blood [Na+] is largely determined by the severity of the clinical signs and symptoms associated with cellular shrinkage (crenation)....
Article
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In both hyponatremia and hypernatremia, the sodium value (numerator) appears the most deranged. However, it is the changes in water content (denominator) that is most responsible for the pathophysiology, morbidity and mortality associated with dysnatremia. Therefore, fluid homeostasis involves both short-term and long-term water regulation at the m...
Article
Full-text available
Hyponatremia is biochemically defined by a blood sodium concentration ([Na+]) below the normal reference range for the laboratory performing the test (typically <135 mmol/L). The clinical relevance of a below normal blood [Na+] is largely determined by the severity of the clinical signs and symptoms associated with cellular swelling. Severe hyponat...
Article
Full-text available
Background: Current literature evaluating body mass (BM) changes across a variety of running race distances is limited. The primary objective of this study was to profile the range of BM changes across race distances. The secondary objective was to evaluate the prevalence of exercise-associated hyponatremia (EAH) in runners admitted to the on-site...
Article
Full-text available
Background: Current literature evaluating body mass (BM) changes across a variety of running race distances is limited. The primary objective of this study was to profile the range of BM changes across race distances. The secondary objective was to evaluate the prevalence of exercise-associated hyponatremia (EAH) in runners admitted to the on-site...
Article
A 37-year-old woman presented to the emergency department with severe headache, which quickly progressed to altered mental status and seizure activity in hospital. Her initial serum sodium concentration ([Na+]) was 126 mmol/L. In the 24 hours before admission, she exercised vigorously for 120 minutes (interval training plus yoga) and also consumed...
Article
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Purpose: It is not known if exercise-associated hyponatremia (EAH) is a cause or consequence of exertional rhabdomyolysis (ER).We hypothesized that osmotic stress (EAH) coupled with mechanical stress (running) potentiated muscle cell breakdown (ER). This concept would be supported if a nadir in serum sodium concentration ([Na(+)]) temporally prece...
Article
Objective: To identify midseason risk factors for symptomatic exertional rhabdomyolysis (sER) in swimmers after a novel upper body workout. Design: Retrospective (1) survey and (2) analyses of observational laboratory data conducted over a 16-week training period, 2 months before sER. Setting: Midwest University. Participants: Thirty-four co...
Article
This study explored possible contributing factors to gastrointestinal distress, including endotoxemia, hyperthermia, dehydration and nutrition, during a 161-km ultramarathon. Thirty runners participated in the study and 20 finished the race. At three checkpoints and the finish, runners were interviewed to assess the incidence and severity of 12 gas...
Article
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Kenney et al. reported that 54.5% of 4134 children were inadequately hydrated, as defined by a single urine osmolality (Uosm) of 800 or greater milliosmoles per kilogram of water.(1) This "dehydration" threshold was inferred from experimental data first described in 1965,(2) with subsequent studies on US, Jewish, German, and Swedish children demons...