Jamie F Burr

Jamie F Burr
University of Guelph | UOGuelph · Department of Human Health and Nutritional Sciences (HHNS)

PhD

About

185
Publications
97,566
Reads
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2,841
Citations
Introduction
I am a health and performance researcher, based in Guelph Ontario Canada. Our lab's research interests focus on cardiovascular physiology, and interventions to affect basic function, disease progression, or human performance. Twitter: @Dr_Burr Lab Website: http://bit.ly/HumanPerformanceLab
Additional affiliations
August 2015 - present
University of Guelph
Position
  • Professor (Associate)
July 2012 - July 2015
University of Prince Edward Island
Position
  • Professor (Assistant)
July 2010 - August 2012
University of British Columbia - Vancouver
Position
  • PostDoc Position
Description
  • Chronic disease prevention
Education
September 2006 - May 2010
York University
Field of study
  • Cardiometabolic Exercise Physiology
September 2004 - December 2005
York University
Field of study
  • Cardiorespiratory Exercise Science
September 1999 - April 2003
The University of Western Ontario
Field of study
  • Kinesiology

Publications

Publications (185)
Article
Full-text available
Background: Overreaching is the transient reduction in performance that occurs following training overload and is driven by an imbalance between stress and recovery. Low energy availability (LEA) may drive underperformance by compounding training stress; however, this has yet to be investigated systematically. Objective: The aim of this study wa...
Article
Glucose ingestion and absorption into the blood stream can challenge glycemic regulation and vascular endothelial function. Muscular contractions in exercise promote a return to homeostasis by increasing glucose uptake and blood flow. Similarly, muscle hypoxia supports glycemic regulation by increasing glucose oxidation. Blood flow restriction (BFR...
Article
Purpose: Along with past performance, professional teams consider physical fitness and physiological potential in determining the value of prospective draft picks. The National Hockey League (NHL) Combine fitness results have been examined for their ability to predict draft order, but not bona fide hockey performance. Therefore, we sought to ident...
Article
Full-text available
Objective: To characterize and compare the sport-specific cardiac structure of elite swimmers (SW), water polo players (WP), and artistic swimmers (AS). Design: A cross-sectional assessment of elite aquatic athletes' hearts. Setting: The athletes' village at the 2019 FINA World Championships. Participants: Ninety athletes from swimming (SW)...
Article
Full-text available
This study determined the reliability and validity of a Kinexon local positioning system (LPS) for measuring external load in ice hockey players during an on-ice session. Fourteen ice hockey players (25.1 y, 78.6 kg, 176.9 cm) wore two LPS sensors to examine the inter-sensor reliability of the LPS during an on-ice session, and LPS speed and acceler...
Article
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Purpose: Elite swimmers (Sw) have lower diastolic function compared to elite runners, possibly as an adaptation to the aquatic training environment. Water polo players (WP) and artistic swimmers (AS) are exposed to the same hydrostatic pressures as Sw, but are subject to different training intensities, postures, and hemodynamic stressors. Our purp...
Article
Full-text available
Cannabis is widely used for both recreational and medicinal purposes on a global scale. There is accumulating interest in the use of cannabis and its constituents for athletic recovery, and in some instances, performance. Amidst speculation of potential beneficial applications, the effects of cannabis and its two most abundant constituents, delta-9...
Article
Full-text available
Purpose Limb immobilization causes local vasculature to experience detrimental adaptations. Simple strategies to increase blood flow (heating, fidgeting) successfully prevent acute (≤ 1 day) impairments; however, none have leveraged the hyperemic response over prolonged periods (weeks) mirroring injury rehabilitation. Throughout a 14-day unilateral...
Article
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PurposeFactors such as prone body position, hydrostatic pressure, and intermittent breath-holding subject aquatic athletes to unique physical and environmental stressors during swimming exercise. The relationship between exposure to aquatic exercise and both arterial stiffness and wave reflection properties is not well-understood. This study assess...
Article
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Both dietary and exercise behaviors need to be considered when examining underlying causes of low energy availability (LEA). The study assessed if exercise dependence is independently related to the risk of LEA with consideration of disordered eating and athlete calibre. Via survey response, female (n = 642) and male (n = 257) athletes were categor...
Article
Cerqueira, MS, Lira, M, Mendonça Barboza, JA, Burr, JF, Wanderley e Lima, TB, Maciel, DG, and De Brito Vieira, WH. Repetition failure occurs earlier during low-load resistance exercise with high but not low blood flow restriction pressures: a systematic review and meta-analysis. J Strength Cond Res XX(X): 000-000, 2021-High-load and low-load resist...
Article
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Purpose The purpose of this study was to examine whether an individual’s IPC-mediated change in cold pain sensitivity is associated with the same individual’s IPC-mediated change in exercise performance. Methods Thirteen individuals (8 males; 5 females, 27 ± 7 years, 55 ± 5 ml.kgs –1 .min –1 ) underwent two separate cold-water immersion tests: with...
Preprint
Purpose: Elite swimmers (SW) have reduced diastolic function compared to elite runners, possibly as an adaptation to the aquatic training environment. Water polo players (WP) and artistic swimmers (AS) are exposed to the same hydrostatic pressures as SW, but are subject to different training intensities, postures, and hemodynamic stressors. Our pur...
Article
Full-text available
Since the first modern Olympic Games in 1896, the aquatic sports have expanded both in participation and innovation over the last century. Beginning with swimming, diving, water polo, and later additions of artistic swimming, open water swimming and high diving, the aquatics sports represent a core pillar of Olympic disciplines. The rapid expansion...
Preprint
Full-text available
Background: The “athlete’s heart” has been well characterized, and it is known that remodeling is dependent on the nature of the hemodynamic-stimuli. Aquatic-athletes are exposed to hydrostatic pressures, postural anomalies, and breath-holds that likely drive distinct cardiac adaptation; however, the aquatic-athlete’s heart has not been specificall...
Article
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Despite compelling muscular structure and function changes resulting from blood flow restricted (BFR) resistance training, mechanisms of action remain poorly characterized. Alterations in tissue O 2 saturation (TSI%) and metabolites are potential drivers of observed changes, but their relationships with degree of occlusion pressure are unclear. We...
Article
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Acute elevations in inflammatory cytokines have been demonstrated to increase aortic and left ventricular stiffness and reduce endothelial function in healthy subjects. As vascular and cardiac function are often transiently reduced following prolonged exercise, it is possible that cytokines released during exercise may contribute to these alteratio...
Article
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The manipulation of blood flow in conjunction with skeletal muscle contraction has greatly informed the physiological understanding of muscle fatigue, blood pressure reflexes, and metabolism in humans. Recent interest in using intentional blood flow restriction (BFR) has focused on elucidating how exercise during periods of reduced blood flow affec...
Article
Snowmobiling and off-road vehicle use are increasingly popular leisure activities. Motorized recreation can occur during winter when citizens of colder climate countries experience more risk factors for mental illnesses: a reduction in natural light, outdoor time, and physical activity. Physical activity can greatly impact an individual’s mental he...
Article
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Cigarette smoking is amongst the most detrimental behaviours to cardiovascular health, resulting in arterial stiffening, endothelial dysfunction, and structural/functional alterations to the myocardium. Similar to cigarettes, cannabis is commonly smoked and next to alcohol, is the most commonly used recreational substance in the world. Despite this...
Article
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Purpose: While the possible ergogenic benefits of remote ischemic preconditioning (RIPC) make it an attractive training modality, the mechanisms of action remain unclear. Alterations in neural tone have been demonstrated in conjunction with circulatory occlusion, yet investigation of the autonomic nervous system following RIPC treatment has receive...
Article
Purpose: Sprint interval training (SIT) has gained popularity as a time-effective alternative to moderate-intensity endurance training (END). However, whether SIT is equally effective for decreasing cardiometabolic risk factors remains debatable, as many beneficial effects of exercise are thought to be transient and, unlike END, SIT is not recomme...
Article
Thompson, KM, Safadie, A, Ford, J, and Burr, JF. Off-ice resisted sprints best predict all-out skating performance in varsity hockey players. J Strength Cond Res XX(X): 000-000, 2020-Off-ice fitness testing is commonly used to predict the physiological abilities of ice-hockey players. Although there is a notable association between certain off-ice...
Article
Purpose: To investigate the effects of blood flow restriction (BFR) combined with electrical muscle stimulation (EMS) on skeletal muscle mass and strength during a period of limb disuse. Methods: Thirty healthy participants (22 ± 3 years; 23 ± 3 kg·m) were randomly assigned to either: control (CON; n=10), BFR alone (BFR; n=10), or BFR combined w...
Poster
Full-text available
INTRODUCTION: It is well established that aerobic exercise induces beneficial effects on cardiovascular health, due in part to vascular remodeling. Previous investigations have shown that individuals who regularly participate in certain activities can demonstrate sport-dependent vascular adaptations. The vascular phenotype of elite-level aquatic at...
Poster
Full-text available
During periods of immobilization, the peripheral vasculature, like the musculature, undergoes adaptations as a result of disuse. For individuals subjected to bedrest, or athletes recovering from injury, maintenance of arterial function is important for return to habitual activity and sport. Using a model demonstrated to be effective for the preserv...
Article
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Cardiac function has been shown to transiently decrease following prolonged exercise, with greater durations related to increased impairment. However, the prospective assessment of exercise duration on cardiac performance is rare, and the influence of relative exercise intensity is typically not assessed in relation to these changes. The aim of thi...
Article
Caron, KE, Burr, JF, and Power, GA.. The effect of a stretch-shortening cycle on muscle activation and muscle oxygen consumption: a study of history-dependence. J Strength Cond Res XX(X): 000-000, 2020-Stretch-shortening cycles (SSCs) are observed in a variety of human movements and are associated with increases in performance. Few studies have con...
Article
Purpose: Ultra-endurance exercise is steadily growing in popularity; however, the impact of increasingly prolonged durations of exercise on the vascular endothelium is unknown. The aim of this study was to characterize the impact of various ultramarathon running distances on vascular form and function. Methods: We evaluated vascular endothelial...
Article
Low‐load blood flow restriction (LL‐BFR) training improves muscular adaptation compared to traditional low‐load resistance exercise (LL‐RE), when matched for work. However, when both are performed to task‐failure, similar improvements in muscular strength and hypertrophy occur. At task‐failure the perceived discomfort after a single bout of LL‐BFR...
Article
Full-text available
Whinton, AK, Donahoe, K, Gao, R, Thompson, KMA, Aubry, R, Saunders, TJ, Johnston, A, Chilibeck, PD, and Burr, JF. Repeated application of a novel creatine cream improves muscular peak and average power in male subjects. J Strength Cond Res 34(9): 2482-2491, 2020-Using a multicenter, randomized controlled trial, (N = 123, age 23 ± 4 years) we sought...
Article
Key points: Ketone bodies are proposed to represent an alternative fuel source driving energy production, particularly during exercise. Biologically, the extent to which mitochondria utilize ketone bodies compared to other substrates remains unknown. We demonstrate in vitro that maximal mitochondrial respiration supported by ketone bodies is low w...
Preprint
Full-text available
The physiological determinants of ultramarathon success have rarely been assessed, and likely differ in their contributions to performance as race distance increases. The aim of this study was to examine predictors of performance in athletes who completed either a 50km (n:23, F:11), 80km (n:14, F:4), or 160km (n:14, F:2) trail race over a 20km-loop...
Article
Full-text available
Purpose: Ischemic preconditioning (IPC) through purposeful circulatory occlusion may enhance exercise performance. The value of IPC for improving performance is controversial owing to challenges with employing effective placebo controls. This study examines the efficacy of IPC vs a deceptive sham protocol for improving performance to determine whe...
Article
Background: The dynamics ofpulsatile waveforms travelling the central aorta are governed by pressures and arterial compliance. Arterial stiffness, the inverse of compliance, is an independent risk factor for cardiovascular disease and has been suggested as a superior risk index compared to brachial blood pressure (BP). Arterial stiffness is typica...
Poster
Cannabis ranks globally as the most commonly used recreational drug, and both recreational and medicinal use have recently been legalized in numerous states and countries. The most common means by which cannabis is consumed recreationally is via smoking. Despite its prominent global use, a thorough understanding of the chronic cardiovascular effect...
Article
Full-text available
Relative energy deficiency in sport (RED-S) can result in negative health and performance outcomes in both male and female athletes. The underlying etiology of RED-S is low energy availability (LEA), which occurs when there is insufficient dietary energy intake to meet exercise energy expenditure, corrected for fat-free mass, leaving inadequate ene...
Article
Full-text available
Context: The physiological determinants of ultramarathon success have rarely been assessed and likely differ in their contributions to performance as race distance increases. Purpose: To examine predictors of performance in athletes who completed either a 50-, 80-, or 160-km trail race over a 20-km loop course on the same day. Methods: Measure...
Poster
Full-text available
Blood flow restriction (BFR) training involves the intentional reduction of blood flow during exercise and is increasingly recognized as an effective method for inducing muscular adaptation when using low-load resistance exercise (LL-RE). Previous work has demonstrated LL-RE to induce similar adaptations to low-load BFR when both are performed to r...
Article
Full-text available
The current manuscript sets out a series of guidelines for blood flow restriction exercise, focusing on the methodology, application and safety of this mode of training. With the emergence of this technique and the wide variety of applications within the literature, the aim of this review is to set out a current research informed guide to blood flo...
Article
Full-text available
Purpose: To use repeated control trials to measure within-subject variability and assess the existence of responders to ischemic preconditioning (IPC). Secondly, to determine whether repeated IPC can evoke a dosed ergogenic response. Methods: Twelve aerobically fit individuals each completed three control and three IPC 5-km cycling time trials....
Article
Background: Insufficient physical activity (PA) is associated with numerous chronic diseases and premature mortality, and the challenge of meeting recommended PA guidelines is exacerbated in the winter. Snowmobiling can potentially contribute to PA accumulation, but the objective metabolic and physical demands are unclear. The purpose of this stud...
Article
The influence of muscle sympathetic nerve activity (MSNA) responses on local vascular conductance during exercise are not well established. Variations in exercise mode and active muscle mass can produce divergent MSNA responses. Therefore, we sought to examine the effects of small vs. large muscle mass dynamic exercise on vascular conductance and M...
Article
Key points: Blood flow restricted resistance exercise (BFR-RE) is capable of inducing comparable adaptations to traditional resistance exercise (RE), despite a lower total exercise volume. It has been suggested that an increase in reactive oxygen species (ROS) production may be involved in this response, however oxygen partial pressure (pO2 ) is r...
Article
Full-text available
Purpose To examine if repeated exposure to IPC treatment prior to training sessions improves oxygen uptake and 1-km running performance in highly trained middle-distance runners. Methods Fourteen highly trained endurance runners (11 male/3 female, 19 ± 2 years, 64 ± 5 ml kg⁻¹ min⁻¹) completed a baseline maximal oxygen consumption (\(\dot{V}{\text{...
Poster
A transient reduction in cardiac function following prolonged endurance exercise, termed exercise-induced cardiac fatigue, has previously been reported following events ranging from 2-40hrs. Right-ventricular dysfunction has been demonstrated to occur prior to left-ventricular dysfunction and, similarly, diastolic impairments may occur prior to sys...
Article
Full-text available
The current manuscript sets out a position stand for blood flow restriction exercise, focusing on the methodology, application and safety of this mode of training. With the emergence of this technique and the wide variety of applications within the literature, the aim of this position stand is to set out a current research informed guide to blood f...
Article
Due to the increased popularity of standing-based occupational work stations there is a growing need to understand the impact of ergonomic aids such as standing mats. In particular, while standing mats have been studied in relation to musculoskeletal discomfort and pain, there have been no studies exploring the effects of their use on metabolism an...
Article
Full-text available
During play, ice hockey goaltenders routinely dehydrate through sweating and lose ≥2% body mass, which may impair thermoregulation and performance. Purpose: This randomized, crossover study examined the effects of mild dehydration on goaltender on-ice thermoregulation, heart rate, fatigue, and performance. Methods: Eleven goaltenders played a 7...
Article
Full-text available
Purpose: To identify the combined effect of increasing tissue level oxygen consumption and metabolite accumulation on the ergogenic efficacy of ischemic preconditioning (IPC) during both maximal aerobic and maximal anaerobic exercise. Methods: Twelve healthy males (22 ± 2 years, 179 ± 2 cm, 80 ± 10 kg, 48 ± 4 ml.kg−1.min⁻¹) underwent four experimen...