Search results for: Lawrence E. Armstrong

Items from 1 to 20 out of 32 results

article

Hoffman MD, Snipe RM, Costa RJ (2018) Ad libitum drinking adequately supports hydration during 2 h of running in different ambient temperatures. Eur J Appl Physiol 118:2687–2697

Lawrence E. Armstrong, Michael F. Bergeron

European Journal of Applied Physiology > 2019 > 119 > 6 > 1451-1452

Communicated by Westerterp/Westerblad.

article

Blood Hemostatic Changes During an Ultraendurance Road Cycling Event in a Hot Environment

Brian R. Kupchak, Josh B. Kazman, Jakob L. Vingren, Danielle E. Levitt, more

Wilderness & Environmental Medicine > 2017 > 28 > 3 > 197-206

This study aims to examine blood hemostatic responses to completing a 164-km road cycling event in a hot environment.Thirty-seven subjects (28 men and 9 women; 51.8±9.5 [mean±SD] y) completed the ride in 6.6±1.1 hours. Anthropometrics (height, body mass [taken also during morning of the ride], percent body fat [%]) were collected the day before the ride. Blood samples were collected on the morning...

article

Relationships between hydration biomarkers and total fluid intake in pregnant and lactating women

Amy L. McKenzie, Erica T. Perrier, Isabelle Guelinckx, Stavros A. Kavouras, more

European Journal of Nutrition > 2017 > 56 > 6 > 2161-2170

Introduction Previous research established significant relationships between total fluid intake (TFI) and urinary biomarkers of the hydration process in free-living males and females; however, the nature of this relationship is not known for pregnant (PREG) and lactating (LACT) women. Purpose To determine the relationship between urinary and hematological hydration biomarkers with TFI in PREG and...

article

COUNTERVIEW: Is Drinking to Thirst Adequate to Appropriately Maintain Hydration Status During Prolonged Endurance Exercise? No

Lawrence E. Armstrong, Evan C. Johnson, Michael F. Bergeron

Wilderness & Environmental Medicine > 2016 > 27 > 2 > 195-198

article

REBUTTAL from “No”

Lawrence E. Armstrong, Evan C. Johnson, Michael F. Bergeron

Wilderness & Environmental Medicine > 2016 > 27 > 2 > 200-202

article

An empirical method to determine inadequacy of dietary water

Lawrence E. Armstrong, Evan C. Johnson, Amy L. McKenzie, Colleen X. Muñoz

Nutrition > 2016 > 32 > 1 > 79-82

The physiological regulation of total body water and fluid concentrations is complex and dynamic. The human daily water requirement varies because of differences in body size, dietary solute load, exercise, and activities. Although chronically concentrated urine increases the risk of renal diseases, an empirical method to determine inadequate daily water consumption has not been described for any...

article

Pro- and anti-inflammatory cytokine responses to a 164-km road cycle ride in a hot environment

Hui-Ying Luk, Danielle E. Levitt, Elaine C. Lee, Matthew S. Ganio, more

European Journal of Applied Physiology > 2016 > 116 > 10 > 2007-2015

Purpose The purpose of this study was to examine the circulating cytokine response to a recreational 164-km road cycling event in a high ambient temperature and to determine if this response was affected by self-paced exercise time to completion. Methods Thirty-five men and five women were divided into tertiles based on time to complete the cycling event: slowest (SLOW), moderate (MOD), and fastest...

article

Urine colour change as an indicator of change in daily water intake: a quantitative analysis

Erica T. Perrier, Evan C. Johnson, Amy L. McKenzie, Lindsay A. Ellis, more

European Journal of Nutrition > 2016 > 55 > 5 > 1943-1949

Purpose Urine colour (U _Col) is simple to measure, differs between low-volume and high-volume drinkers, and is responsive to changes in daily total fluid intake (TFI). However, to date, no study has quantified the relationship between a change in TFI and the resultant change in U _Col. This analysis aimed to determine the change in TFI needed to adjust 24-h U _Col by 2...

article

Urine color as an indicator of urine concentration in pregnant and lactating women

Amy L. McKenzie, Colleen X. Muñoz, Lindsay A. Ellis, Erica T. Perrier, more

European Journal of Nutrition > 2017 > 56 > 1 > 355-362

Aim Urine concentration measured via osmolality (U_OSM) and specific gravity (U_SG) reflects the adequacy of daily fluid intake, which has important relationships to health in pregnant (PREG) and lactating (LACT) women. Urine color (U_COL) may be a practical, surrogate marker for whole-body hydration status. Purpose To determine whether U_COL was a valid measure of urine concentration in PREG and...

article

Habitual total water intake and dimensions of mood in healthy young women

Colleen X. Muñoz, Evan C. Johnson, Amy L. McKenzie, Isabelle Guelinckx, more

Appetite > 2015 > 92 > Complete > 81-86

Acute negative and positive mood states have been linked with the development of undesirable and desirable health outcomes, respectively. Numerous factors acutely influence mood state, including exercise, caffeine ingestion, and macronutrient intake, but the influence of habitual total water intake remains unknown. The purpose of this study was to observe relationships between habitual water intake...

article

Bike and run pacing on downhill segments predict Ironman triathlon relative success

Evan C. Johnson, J. Luke Pryor, Douglas J. Casa, Luke N. Belval, more

Journal of Science and Medicine in Sport > 2015 > 18 > 1 > 82-87

Determine if performance and physiological based pacing characteristics over the varied terrain of a triathlon predicted relative bike, run, and/or overall success.Poor self-regulation of intensity during long distance (Full Iron) triathlon can manifest in adverse discontinuities in performance.Observational study of a random sample of Ironman World Championship athletes. High performing and low performing...

article

Effect of cycling in the heat for 164 km on procoagulant and fibrinolytic parameters

Brian R. Kupchak, Amy L. McKenzie, Hui-Ying Luk, Cathy Saenz, more

European Journal of Applied Physiology > 2015 > 115 > 6 > 1295-1303

Purpose We assessed the impact of completing the Hotter’n Hell Hundred (HHH), an annual 164 km road cycling event performed in a hot environment, on hemostatic balance in men. Methods Sixteen men who completed the ride in <6 h were included in this study. Plasma samples were collected on that morning of the ride (PRE) and immediately on the completion of the ride (IP). Primary hemostasis was...

article

Markers of the hydration process during fluid volume modification in women with habitual high or low daily fluid intakes

Evan C. Johnson, Colleen X. Muñoz, Laurent Bellego, Alexis Klein, more

European Journal of Applied Physiology > 2015 > 115 > 5 > 1067-1074

Purpose Human daily total water intake (TWI) has a large inter-individual range. Recently, water supplementation has been suggested as a potential preventative and therapeutic modality. Thus, we aimed to measure hydration biomarkers in women with high (HIGH) versus low (LOW) daily TWI to determine baseline differences, and the efficacy of these markers during a systematic alteration in TWI. ...

article

Second International ILSI North America Conference on Hydration and Health, November 15–16, 2011 – Miami Beach, Florida

Lawrence E Armstrong, Ann C Grandjean, Harris R Lieberman, Ron Maughan

Nutrition Reviews > 70 > s2 > S97 - S97

article

Challenges of linking chronic dehydration and fluid consumption to health outcomes

Lawrence E Armstrong

Nutrition Reviews > 70 > s2 > S121 - S127

The purpose of this article is to review the effects of chronic mild dehydration and fluid consumption on specific health outcomes including obesity. The electronic databases PubMed and Google Scholar were searched for relevant literature published from the time of their inception to 2011, with results restricted to studies performed on human subjects and reports in the English language. Key words...

article

Hydration Biomarkers and Dietary Fluid Consumption of Women

Lawrence E. Armstrong, Evan C. Johnson, Colleen X. Munoz, Brittany Swokla, more

Journal of the Academy of Nutrition and Dietetics > 2012 > 112 > 7 > 1056-1061

Normative values and confidence intervals for the hydration indices of women do not exist. Also, few publications have precisely described the fluid types and volumes that women consume. This investigation computed seven numerical reference categories for widely used hydration biomarkers (eg, serum and urine osmolality) and the dietary fluid preferences of self-reported healthy, active women. Participants...

article

Eleven days of moderate exercise and heat exposure induces acclimation without significant HSP70 and apoptosis responses of lymphocytes in college-aged males

Lindsay L. Hom, Elaine Choung-Hee Lee, Jenna M. Apicella, Sean D. Wallace, more

Cell Stress and Chaperones > 2012 > 17 > 1 > 29-39

The purpose of this study was to assess whether a lymphocyte heat shock response and altered heat tolerance to ex vivo heat shock is evident during acclimation. We aimed to use flow cytometry to assess the CD3⁺CD4⁺ T lymphocyte cell subset. We further aimed to induce acclimation using moderately stressful daily exercise-heat exposures to achieve acclimation. Eleven healthy males underwent 11 days...

article

Effect of caffeine on internal temperature

Matthew S. Ganio, Lawrence E. Armstrong

European Journal of Applied Physiology > 2012 > 112 > 5 > 1977-1978

Communicated by Susan A. Ward.

article

Caffeine lowers muscle pain during exercise in hot but not cool environments

Matthew S. Ganio, Evan C. Johnson, Rebecca M. Lopez, Rebecca L. Stearns, more

Physiology & Behavior > 2011 > 102 > 3-4 > 429-435

Caffeine (CAF) ingestion may enhance endurance exercise by lowering perceived exertion (RPE) and muscle pain. However, exercise in the heat may be detrimental to performance by increasing RPE and pain. The purpose of this study was to examine if caffeine affects pain and related perceptual responses differently in cool and hot ambient conditions. Eleven male cyclists (mean±SD; age, 25±6years; mass,...

article

Effect of ambient temperature on caffeine ergogenicity during endurance exercise

Matthew S. Ganio, Evan C. Johnson, Jennifer F. Klau, Jeffrey M. Anderson, more

European Journal of Applied Physiology > 2011 > 111 > 6 > 1135-1146

It is well established that caffeine ingestion during exercise enhances endurance performance. Conversely, the physiological and psychological strain that accompanies increased ambient temperature decreases endurance performance. Little is known about the interaction between environmental temperature and the effects of caffeine on performance. The purpose of this study was to compare the effects of...

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Search results for: Lawrence E. Armstrong

Hoffman MD, Snipe RM, Costa RJ (2018) Ad libitum drinking adequately supports hydration during 2 h of running in different ambient temperatures. Eur J Appl Physiol 118:2687–2697

Blood Hemostatic Changes During an Ultraendurance Road Cycling Event in a Hot Environment

Relationships between hydration biomarkers and total fluid intake in pregnant and lactating women

COUNTERVIEW: Is Drinking to Thirst Adequate to Appropriately Maintain Hydration Status During Prolonged Endurance Exercise? No

REBUTTAL from “No”

An empirical method to determine inadequacy of dietary water

Pro- and anti-inflammatory cytokine responses to a 164-km road cycle ride in a hot environment

Urine colour change as an indicator of change in daily water intake: a quantitative analysis

Urine color as an indicator of urine concentration in pregnant and lactating women

Habitual total water intake and dimensions of mood in healthy young women

Bike and run pacing on downhill segments predict Ironman triathlon relative success

Effect of cycling in the heat for 164 km on procoagulant and fibrinolytic parameters

Markers of the hydration process during fluid volume modification in women with habitual high or low daily fluid intakes

Second International ILSI North America Conference on Hydration and Health, November 15–16, 2011 – Miami Beach, Florida

Challenges of linking chronic dehydration and fluid consumption to health outcomes

Hydration Biomarkers and Dietary Fluid Consumption of Women

Eleven days of moderate exercise and heat exposure induces acclimation without significant HSP70 and apoptosis responses of lymphocytes in college-aged males

Effect of caffeine on internal temperature

Caffeine lowers muscle pain during exercise in hot but not cool environments

Effect of ambient temperature on caffeine ergogenicity during endurance exercise

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