Edward Coyle

Edward Coyle
University of Texas at Austin | UT · Department of Kinesiology and Health Education

Ph.D.

About

242
Publications
168,528
Reads
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25,497
Citations
Citations since 2017
20 Research Items
6049 Citations
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Introduction
Dr. Coyle directs the Human Performance Laboratory at the University of Texas at Austin. His research focuses on the metabolic and cardiovascular factors that limit exercise performance. Recently, he has investigated the cardio-metabolic effects of prolonged sitting and the amount of exercise needed to counteract the negative health consequences of daily sedentary behavior. Furthermore, he will be studying 50-70 y men and women to determine the extent to which 'power' training can reverse their loss of muscle mass and if nutritional supplementation can augment the improvements in muscle function.

Publications

Publications (242)
Article
Integrative cardiovascular responses to heat stress during endurance exercise depend on various variables, such as thermal stress and exercise intensity. This review addresses how increases in skin temperature alter and challenge the integrative cardiovascular system during upright submaximal endurance exercise, especially when skin is hot (i.e. >3...
Article
Prolonged sitting prevents a 1-h bout of running from improving fat oxidation and reducing plasma triglycerides. This "Exercise Resistance" can be prevented by taking 8,500 steps/d or by interrupting 8-h of sitting with hourly cycle sprints. We hypothesize that there is an interplay between background physical activity (e.g.; steps/d) and the exerc...
Article
Full-text available
PurposeInterval exercise allows very high-power outputs to be maintained, a key for stimulating training adaptations. The main purpose of this study was to develop a sprint interval protocol that stimulated both anaerobic and aerobic systems while maximizing power output and minimizing fatigue. The secondary goal was to investigate the influence of...
Article
Introduction: High-intensity interval training (HIIT) is an effective tool to improve cardiovascular fitness and maximal anaerobic power. Different methods of HIIT have been studied but the effects of repeated maximal effort cycling with very short exercise time (i.e., 4-s) and short recovery time (15-30 s) might suit individuals with limited time...
Article
Purpose: This study determined if the level of background physical inactivity (steps per day) influences the acute and short-term adaptations to intense aerobic training. Methods: Sixteen untrained participants (23.6 ± 1.7 yr) completed intense (80%-90% V˙O2peak) short-term training (5 bouts of exercise over 9 d) while taking either 4767 ± 377 s...
Article
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Purpose: The biomechanical differences between cyclists with a high compared with a low blood lactate threshold (HLT; 80% VO2max vs LLT, 70% VO2max) have yet to be completely described. We hypothesize that HLT cyclists reduce the stress placed on the knee extensor muscles by increasing the relative contribution from the hip joint during high-inten...
Article
Purpose: Reductions in skeletal muscle mass, beginning after the 3rd decade of life, reduce maximal neuromuscular power (Pmax). Maximal aerobic power generation is also reduced. The primary purpose of this study was to investigate the effectiveness of maximal power cycling (PC) training using an inertial load ergometer on skeletal muscle mass and...
Article
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Introduction: Two benefits of acute exercise are the next day's lowering of the postprandial plasma triglyceride response to a high fat meal and increased fat oxidation. However, if activity levels (daily steps) are very low, these acute adaptations to exercise don't occur. This phenomenon has been termed 'exercise resistance'. This study sought t...
Article
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High postprandial plasma lipids (PPL; i.e., triglycerides) are a risk factor for cardiovascular disease. Physical inactivity, characterized by prolonged sitting and a low step count, elevates PPL and thus risk of disease. Purpose: This study determined if the interruption of prolonged sitting (i.e., 8 h of inactivity) with hourly cycling sprints...
Article
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Prolonged periods of sedentary behavior are linked to cardiometabolic disease independent of exercise and physical activity. This study examined the effects of posture by comparing one day of sitting (14.4 ± 0.3 h) to one day of standing (12.2 ± 0.1 h) on postprandial metabolism the following day. Eighteen subjects (9 men, 9 women; 24 ± 1 y) comple...
Article
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PURPOSE: Maximal strength and neuromuscular power decline after the fourth decade of life. The physiological cause of this progression is partly a selective atrophy of Type II or “Fast-twitch” muscle fibers. The aim of this study was to determine the efficacy of a novel, time-efficient form of exercise training involving repeated sprints lasting 4...
Article
It is well known that hyperthermia lowers stroke volume (SV) during moderate-intensity prolonged exercise, yet the underlying mechanism is inconclusive, especially when skin temperature (Tsk) is hot (≥38°C). Purpose: In the present study, HR was independently lowered by a low dose of β1-blockade (βB) to investigate its effect on SV during exercis...
Article
Acute exercise improves postprandial lipemia, glucose tolerance, and insulin sensitivity, all of which are risk factors for cardiovascular disease. However, recent research suggests that prolonged sedentary behavior might abolish these healthy metabolic benefits. Accordingly, this study aimed to elucidate the impact of an acute bout of exercise on...
Article
John O. Holloszy, as perhaps the world's preeminent exercise biochemist/physiologist, published >400 papers over his 50+ year career, and they have been cited >41,000 times. In 1965 Holloszy showed for the first time that exercise training in rodents resulted in a doubling of skeletal muscle mitochondria, ushering in a very active era of skeletal m...
Article
The decline in stroke volume (SV) during exercise in the heat has been attributed to either an increase in cutaneous blood flow (CBF) that reduces venous return or an increase in heart rate (HR) that reduces cardiac filling time. However, the evidence supporting each mechanism arises under experimental conditions with different skin temperatures (T...
Article
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The interaction of prolonged sitting with physical exercise for maintaining health is unclear. We tested the hypothesis that prolonged siting would have a deleterious effect on postprandial plasma lipemia (PPL, postprandial plasma triglycerides) and abolish the ability of an acute exercise bout to attenuate PPL. Seven healthy young men performed th...
Article
Purpose: Exercise in hot conditions increases core (TC) and skin temperature (TSK) and can lead to a progressive rise in HR and decline in stroke volume (SV) during prolonged exercise. Thermoregulatory-driven elevations in skin blood flow (SkBF) adds complexity to cardiovascular regulation during exercise in these conditions. Presently, the domina...
Article
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Dietary supplementation with pomegranate juice improves isometric strength recovery after unaccustomed eccentric exercise. The purpose of this study was to determine if there is a dose response effect of pomegranate juice supplementation after eccentric exercise isometric strength recovery. Forty-five nonresistance trained, recreationally active me...
Article
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Acute endurance exercise has been shown to lower postprandial plasma triglyceride concentrations (PPTG); however whether this is due to the negative energy and/or carbohydrate deficit from the exercise bout is not well understood. To examine the effects of a post-exercise meal consisting of either high or low carbohydrate content on PPTG and postpr...
Article
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This investigation sought to determine if supplementation with polyphenol antioxidant (PA) improves exercise performance in the heat (31.5 °C, 55% RH) by altering the cardiovascular and thermoregulatory responses to exercise. Twelve endurance trained athletes ingested PA or placebo (PLAC) for 7 days. Consecutive days of exercise testing were perfor...
Article
The postprandial elevation of triglycerides in the blood (PPTG) is an independent risk factor for atherosclerosis. Although acute exercise typically attenuates PPTG, the effect of exercise intensity on PPTG is less well-established, particularly in well-controlled conditions for physical activities and diet. We sought to determine the efficacy of e...
Article
Acute exercise has been shown to attenuate postprandial plasma triglyceride elevation (PPTG); however the direct contribution of exercise intensity is less well understood. The purpose of this study was to examine the effects of exercise intensity on PPTG and postprandial fat oxidation. Healthy, young men (n=6) performed one of three experimental t...
Article
The purpose of this study was to investigate how maximal power output (PMAX), as measured via the inertial load cycling technique, changes throughout a collegiate soccer season in relation to training load completed. The current investigation took place throughout the 2010 Big XII soccer season. Nineteen Division I female collegiate soccer players...
Article
The purpose of this study was to analyze pedaling cadence, pedal forces, and muscle activation of triathletes during cycling to exhaustion. Fourteen triathletes were assessed at the power output level relative to their maximal oxygen uptake (355 +/- 23 W). Cadence, pedal forces, and muscle activation were analyzed during start, middle, and end test...
Article
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Recent findings have challenged the belief that the cardiac output (CO) and oxygen consumption (VO(2) ) relationship is linear from rest to maximal exercise. The purpose of this study was to determine the CO and stroke volume (SV) response to a range of exercise intensities, 40-100% of VO(2max), during cycling. Ten well-trained cyclists performed a...
Article
The purpose of this study was to determine if pomegranate juice supplementation improved the recovery of skeletal muscle strength after eccentric exercise in subjects who routinely performed resistance training. Resistance trained men (n = 17) were randomized into a crossover design with either pomegranate juice or placebo. To produce delayed onset...
Article
The cardiovascular effects of whole body heat stress during exercise are well established. However the independent contribution of elevated skin temperature (Tsk) or core temperature (Tc) on these responses remains unclear. The purpose of this study was to determine how increases in Tsk and Tc alone and in combination, impact cardiovascular respons...
Article
Full-text available
People who become hyperthermic during exercise display large increases in heart rate (HR) and reductions in stroke volume (SV). It is not clear if the reduction in SV is due primarily to hyperthermia or if it is a secondary effect of an elevation in HR reducing ventricular filling. In the present study, the upward drift of HR during prolonged exerc...
Article
An overnight fast of 8-10 h is normal for most people. Fasting is characterised by a coordinated set of metabolic changes designed to spare carbohydrate and increase reliance on fat as a substrate for energy supply. As well as sparing the limited endogenous carbohydrate, and increased rate of gluconeogenesis from amino acids, glycerol and ketone bo...
Article
See the publication entitled "Effects of Moderate- and Intermittent Low-Intensity Exercise on Postprandial Lipemia" published in Med Sci in Sport Exerc 2014.
Article
This study determined if changes in serum sodium concentration are related to fluid balance as well as sweat sodium losses in triathletes competing in the Hawaii Ironman triathlon. Endurance trained athletes (N = 46, age = 24-67 yr) were studied during 30 min of stationary cycling at 70%-75% of HRmax in a warm outdoor laboratory (26.4 degrees C +/-...
Article
Dietary supplementation with polyphenols,particularly ellagitannins, may attenuate the muscular damage experienced after eccentric exercise, producing delayed-onset muscle soreness. The purpose of this study was to determine whether ellagitannin supplementation from Wonderful variety pomegranate extract (POMx) improved recovery of skeletal muscle s...
Article
Intense exercise performed to exhaustion stresses numerous bodily systems and produces task failure. Although the locus of fatigue appears to be primarily myocellular, this does not minimize the importance of the nervous system, the cardiovascular system, and the endocrine system in supporting muscular power development. The pattern by which the sy...
Article
to the editor: It is an absolute overstatement for Gore et al. ([4][1]) to state that the calculation of delta efficiency is wrong in Coyle ([1][2]). Regardless, it should first be recognized that the conclusions of Coyle ([1][2]) were not based on delta efficiency but rather on gross efficiency.
Article
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This study examined how altering training intensity during a taper impacts maximal mechanical power (Pmax), torque at power maximum (T), velocity at power maximum (V), and swim performance (m . sec (-1)). Using an arm ergometer with inertial loading, measurements of Pmax, T, and V were made for 7 consecutive weeks prior to the taper and during the...
Article
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Efforts to understand human physiology through the study of champion athletes and record performances have been ongoing for about a century. For endurance sports three main factors--maximal oxygen consumption (.VO(2,max)), the so-called 'lactate threshold' and efficiency (i.e. the oxygen cost to generate a given running speed or cycling power outpu...
Article
Running a marathon at the fastest speed possible appears to be regulated by the rate of aerobic metabolism (i.e. marathon oxygen uptake) of a limited amount of carbohydrate energy (i.e. muscle glycogen and blood glucose) and the velocity that can be maintained without developing hyperthermia. According to a model proposed by Joyner in 1991, people...
Conference Paper
Full-text available
Introduction: The crank torque can be used to indicate the capacity of force generation during cycling. The all out tests are commonly applied to determine the maximal power and maximal crank torque output in cycling. However, the bilateral differences when the lower limbs are tested individually are not perfectly explained by the literature. Objec...
Article
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Insight regarding the fluctuations in neuromuscular function among athletes during a taper is lacking. This study examined the time course of changes in maximal mechanical power (Pmax), torque at power maximum (T), velocity at power maximum (V), and swim performance (m x s(-1)) that occur during the taper. Using an arm ergometer with inertial loadi...
Article
Full-text available
This case describes the physiological maturation from ages 21 to 28 yr of the bicyclist who has now become the six-time consecutive Grand Champion of the Tour de France, at ages 27-32 yr. Maximal oxygen uptake (Vo(2max)) in the trained state remained at approximately 6 l/min, lean body weight remained at approximately 70 kg, and maximal heart rate...
Article
This case describes the physiological maturation from ages 21 to 28 yr of the bicyclist who has now become the six-time consecutive Grand Champion of the Tour de France, at ages 27-32 yr. Maximal oxygen uptake (Vo(2max)) in the trained state remained at approximately 6 l/min, lean body weight remained at approximately 70 kg, and maximal heart rate...
Article
This case describes the physiological maturation from ages 21 to 28 yr of the bicyclist who has now become the six-time consecutive Grand Champion of the Tour de France, at ages 27-32 yr. Maximal oxygen uptake (Vo(2 max)) in the trained state remained at approximately 6 l/min, lean body weight remained at approximately 70 kg, and maximal heart rate...
Article
Full-text available
We have recently reported that, during moderate intensity exercise, low muscle glycogen concentration and utilization caused by a high-fat diet is associated with a marked increase in fat oxidation with no effect on plasma glucose uptake (R(d) glucose). It is our hypothesis that this increase in fat oxidation compensates for low muscle glycogen, th...
Article
The amounts of water, carbohydrate and salt that athletes are advised to ingest during exercise are based upon their effectiveness in attenuating both fatigue as well as illness due to hyperthermia, dehydration or hyperhydration. When possible, fluid should be ingested at rates that most closely match sweating rate. When that is not possible or pra...
Article
This study determined the role of intramuscular triglyceride (IMTG) and adipose lipolysis in the elevated fat oxidation during exercise caused by a high-fat diet. In four separate trials, six endurance-trained cyclists exercised at 50% peak O2 consumption for 1 h after a two-day control diet (22% fat, CON) or an isocaloric high-fat diet (60% fat, H...
Article
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The glycemic index (GI) of a food is thought to directly reflect the rate of digestion and entry of glucose into the systemic circulation. The blood glucose concentration, however, represents a balance of both the entry and the removal of glucose into and from the blood, respectively. Such direct quantification of the postprandial glucose curve wit...
Article
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Variations in hospital admission rates have been extensively reported for many years, but this evidence has not had a wide impact on clinical practice. Understanding local reasons for high variation to improve quality of healthcare should be a focus of clinical governance. Our aim was to convert routine hospital activity data into information on a...
Article
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Primary care organisations in the United Kingdom have been given new and challenging population health responsibilities to improve health and address health inequality in local communities through partnership working with local authorities. This requires robust health and social needs assessment data for effective local planning. To assess the use...
Article
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We propose that cardiovascular drift, characterized by a progressive decline in stroke volume after 10-20 min of exercise, is primarily due to increased heart rate rather tahn a progressive increase in cutaneous blood flow as body temperature rises.
Article
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We used beta-adrenergic receptor stimulation and blockade as a tool to study substrate metabolism during exercise. Eight moderately trained subjects cycled for 60 min at 45% of VO(2 peak) 1) during a control trial (CON); 2) while epinephrine was intravenously infused at 0.015 microg. kg(-1) x min(-1) (beta-STIM); 3) after ingesting 80 mg of propran...
Article
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We determined whether a low-fat diet reduces intramuscular triglyceride (IMTG) concentration, whole body lipolyis, total fat oxidation, and calculated nonplasma fatty acid (FA) oxidation during exercise. Seven endurance-trained cyclists were studied over a 3-wk period during which time they exercised 2 h/day at 70% of maximum O2 uptake VO(2 max) an...
Article
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We consider several perceptual issues in the context of machine recognition of music patterns. It is argued that a successful implementation of a music recognition system must incorporate perceptual information and error criteria. We discuss several measures of rhythm complexity which are used for determining relative weights of pitch and rhythm er...
Article
The purpose of this investigation was to determine the time course and magnitude of learning effects associated with repeated maximum cycling power tests and to determine if cycle-trained men exhibit different learning effects than active men who are not cycle-trained. Cycle-trained (N = 13) and active men (N = 35) performed short maximal cycling b...
Article
Both physical activity and diet stimulate processes that, over time, alter the morphologic composition and biochemical function of the body. Physical activity provides stimuli that promote very specific and varied adaptations according to the type, intensity, and duration of exercise performed. There is further interest in the extent to which diet...