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Nathaniel T Berry, Laurie Wideman, Edgar W Shields, Claudio L Battaglini
Multisport events continue to grow in popularity among recreational, amateur, and professional athletes around the world. This study aimed to determine the compounding effects of the initial run and cycling legs of an International Triathlon Union (ITU) Duathlon simulation on maximal oxygen uptake (VO2max), ventilatory threshold (VT) and running economy (RE) within a thermoneutral, laboratory controlled setting. Seven highly trained multisport athletes completed three trials; Trial-1 consisted of a speed only VO2max treadmill protocol (SOVO2max) to determine VO2max, VT, and RE during a single-bout run; Trial-2 consisted of a 10 km run at 98% of VT followed by an incremental VO2max test on the cycle ergometer; Trial-3 consisted of a 10 km run and 30 km cycling bout at 98% of VT followed by a speed only treadmill test to determine the compounding effects of the initial legs of a duathlon on VO2max, VT, and RE...
June 2016: Journal of Sports Science & Medicine
Laura De Pretto, Stephen Acreman, Matthew J Ashfold, Suresh K Mohankumar, Ahimsa Campos-Arceiz
Transboundary haze episodes caused by seasonal forest fires have become a recurrent phenomenon in Southeast Asia, with serious environmental, economic, and public health implications. Here we present a cross-sectional survey conducted among people in Kuala Lumpur and surrounds to assess the links between knowledge, attitudes, and practices in relation to the transboundary haze episodes. Of 305 respondents, 125 were amateur athletes participating in a duathlon event and the remainder were surveyed in an inner-city shopping mall...
2015: PloS One
Kaoru Sugama, Katsuhiko Suzuki, Kayo Yoshitani, Koso Shiraishi, Shigeki Miura, Hiroshi Yoshioka, Yuichi Mori, Takashi Kometani
Thioredoxin (TRX) is a 12 kDa protein that is induced by oxidative stress, scavenges reactive oxygen species (ROS) and modulates chemotaxis. Furthermore it is thought to play a protective role in renal ischemia/reperfusion injury. Complement 5a (C5a) is a chemotactic factor of neutrophils and is produced after ischemia/reperfusion injury in the kidney. Both TRX and C5a increase after endurance exercise. Therefore, it may be possible that TRX has an association with C5a in renal disorders and/or renal protection caused by endurance exercise...
2015: Exercise Immunology Review
K Suzuki, K Shiraishi, K Yoshitani, K Sugama, T Kometani
BACKGROUND: Aim of the present study was to compare the effects of highly branched cyclic dextrin (HBCD) drink with a glucose-based control drink on immunoendocrine responses to endurance exercise. METHODS: Using a randomized, double-blind placebo-controlled cross-over design, seven male triathletes participated in two duathlon races separated by one month, consisting of 5 km of running, 40 km of cycling and 5 km of running. In the first race, four athletes consumed the HBCD-based drink and three athletes consumed the glucose-based drink...
October 2014: Journal of Sports Medicine and Physical Fitness
Rafael Merino-Marban, Emilio Fernandez-Rodriguez, Daniel Mayorga-Vega
A sample of 34 duathlete volunteers was recruited from the competitors in a duathlon sprint. Calf pain and extensibility measures were obtained at baseline, immediately after taping, and 10-15 minutes after competition. Kinesio tape (KT) was applied on the calf of duathletes 20-90 minutes before the competition, only on one of their legs, with the other leg acting as a control. Repeated measures ANOVA results on calf extensibility did not show statistically significant differences [F(2) = 0.180; p = 0.836]...
2014: Research in Sports Medicine
José Moncada-Jimènez, Eric P Plaisance, Michael L Mestek, Felipe Araya-Ramirez, Lance Ratcliff, James K Taylor, Peter W Grandjean, Luis F Aragonvargas
The aim of the study was to investigate the association between the initial metabolic state and exercise-induced endotoxaemia on the appearance of gastrointestinal symptoms (GIS) during exercise. Eleven males (36.6 ± 4.9 yrs, 1.7 ± 0.1 m, 74.5 ± 7.7 kg, DEXA body fat % 17.2 ± 6.6, VO2max 57.4 ± 7.4 ml·kg(-1)·min(-1)) underwent two isoenergetic diets designed to change their initial metabolic status by either depleting or maintaining their hepatic and muscular glycogen content. These diets and accompanying exercise sessions were performed by each participant in the days before completing a laboratory-based duathlon (5-km run, 30-km cycling, 10-km run)...
2009: Journal of Sports Science & Medicine
Rafael Merino-Marban, Daniel Mayorga-Vega, Emilio Fernandez-Rodriguez
The purpose of this study was to examine the effect of the kinesio tape immediately after its application and after a duathlon competition on calf pain and the ankle range of motion in duathletes. A sample of 28 duathletes (age 29.11 ± 10.35 years; body height 172.57 ± 6.17 cm; body mass 66.63 ± 9.01 kg; body mass index 22.29 ± 2.00 kg/m(2)) were recruited from the competitors in a duathlon sprint. The Numerical Pain Rating Scale and ankle dorsiflexion range of motion measures were obtained at baseline, immediately after taping and 10 to 15 minutes after ending the duathlon competition...
2013: Journal of Human Kinetics
Kaoru Sugama, Katsuhiko Suzuki, Kayo Yoshitani, Koso Shiraishi, Takashi Kometani
It has been consistently shown that circulating levels of interleukin (IL)-6, IL-8, IL-1 receptor antagonist (IL-1ra) and IL-10 increase remarkably following endurance exercise longer than 2 h such as marathon and triathlon races. However, no studies have compared changes in the plasma and urinary levels of these cytokines after endurance exercise, including the recovery period. In the present study, we investigated kinetic changes in the urinary excretion of cytokines following endurance exercise up to 3 h after exercise to evaluate the magnitude of change in comparison to the plasma levels and to explore the possible biological significance and the mechanisms of cytokine dynamics following exercise...
2013: Exercise Immunology Review
S Andy Sparks, Don P M Maclaren, Nina E Bridge, N Tim Cable, Dominic A Doran
No abstract text is available yet for this article.
December 2013: International Journal of Sport Nutrition and Exercise Metabolism
Vladimir B Issurin
Training transfer as an enduring, multilateral, and practically important problem encompasses a large body of research findings and experience, which characterize the process by which improving performance in certain exercises/tasks can affect the performance in alternative exercises or motor tasks. This problem is of paramount importance for the theory of training and for all aspects of its application in practice. Ultimately, training transfer determines how useful or useless each given exercise is for the targeted athletic performance...
August 2013: Sports Medicine
Kaoru Sugama, Katsuhiko Suzuki, Kayo Yoshitani, Koso Shiraishi, Takashi Kometani
The T-cell subset Th17 is induced partly by interleukin (IL)-6 and activated by IL-23, and produces a proinflammatory cytokine IL-17. Since IL-6 increases dramatically following long-lasting endurance exercise, this response may also stimulate the induction of IL-17 and IL-23 after exercise. The aim of this study was to clarify the dynamics of IL-17 in association with endurance exercise-induced muscle damage and inflammatory responses. Fourteen male triathletes participated in a duathlon race consisting of 5 km of running, 40 km of cycling and 5 km of running...
2012: Exercise Immunology Review
Christoph A Rüst, Beat Knechtle, Patrizia Knechtle, Susanne Pfeifer, Thomas Rosemann, Romuald Lepers, Oliver Senn
The differences in gender- and the age-related changes in triathlon (i.e., swimming, cycling, and running) performances have been previously investigated, but data are missing for duathlon (i.e., running, cycling, and running). We investigated the participation and performance trends and the gender difference and the age-related decline in performance, at the "Powerman Zofingen" long-distance duathlon (10-km run, 150-km cycle, and 30-km run) from 2002 to 2011. During this period, there were 2,236 finishers (272 women and 1,964 men, respectively)...
February 2013: Journal of Strength and Conditioning Research
Jose Moncada-Jimenez, Eric P Plaisance, Michael L Mestek, Lance Ratcliff, Felipe Araya-Ramirez, James K Taylor, Peter W Grandjean, Luis F Aragonvargas
PURPOSE: This study investigated the effects of short-term dietary changes on metabolism and duathlon performance. METHODS: Eleven men underwent a high-fat (HF; >65% fat from energy) or a high-carbohydrate (CHO; HC) diet (>60% CHO from energy). Energy intake was individualized, and commercially available foods were prepared and packaged for each participant 48 hr before they completed a laboratory-based duathlon (5-km run, 30 km cycling, and 10-km run). Blood samples were obtained before, immediately after, and 1 and 2 hr after the duathlon for determination of glucose, insulin, and glucagon...
February 2009: International Journal of Sport Nutrition and Exercise Metabolism
Renata Teixeira Mamus, Maria Gisele Dos Santos, Bill Campbell, Richard Kreider
The purpose of the present study was to investigate the biochemical effects of carbohydrate supplementation in a simulated competition of short terrestrial duathlon. Ten duathletes participated in a simulated competition of short terrestrial duathlon 30 minutes after the ingestion of a 6% (30 g/500 ml) maltodextrin solution (MALT) or a placebo (PLA). This solution was also ingested every 15 minutes during the competition (12 g/200 ml); and immediately after the competition (18 g/300 ml). Samples of blood were collected at 3 time points: 1) at rest 1 hour before the beginning of the competition; 2) during the competition (approximately 1 hour and 45 minutes after the 1st collection); 3) immediately after the competition...
2006: Journal of the International Society of Sports Nutrition
B Knechtle, A Quarella
We describe the case of a 27-year-old woman with adjustment disorder, disturbances of other feelings such as fear, depression, worries, anxiety and anger due to various burdens such as conflict with boyfriend and unclear job situation (ICD-10 f4323); furthermore, a status after intoxication with sleeping pills (ICD-10 X61) due to a difficult family situation. Regular endurance training helped the young woman to get over her serious life crisis and start a new life without psychiatrist and psychopharmaca. Thanks to progressively increasing running training, the patient was able to run a half-marathon in her first training year and aims for marathon and Powerman-Duathlon in the future...
September 5, 2007: Praxis
S A Sparks, N T Cable, D A Doran, D P M Maclaren
The aim of this study was to evaluate the physiological, metabolic and performance responses to duathlon performance under a range of ambient temperatures. Ten male recreational athletes performed three self-paced duathlon time trials consisting of a 5 km run (R1), a 30 km cycle and a 5 km run (R2) at 10 degrees C, 20 degrees C and 30 degrees C and a relative humidity of 50%. Performance times, heart rate (HR), rating of perceived exertion (RPE), core temperature (Tc) and skin temperature (Tsk) were measured every kilometre...
September 15, 2005: Ergonomics
Stéphane Palazzetti, Anne-Sophie Rousseau, Marie-Jeanne Richard, Alain Favier, Irène Margaritis
The present controlled-training double-blind study (supplemented (S) group, n 7; placebo (P) group, n 10) was designed to investigate whether an antioxidant mixture (Se 150 microg, retinyl acetate mg, ascorbic acid 120 mg, alpha-tocopheryl succinate 20 mg) would allow overloaded triathletes to avoid adaptation failure in the antioxidant system [corrected]. Dietary intakes were recorded. The supplement of Se, and vitamins A and E provided 100 % of the French RDA. Four weeks of overloaded training (OT) followed 4 weeks of normal training (NT)...
January 2004: British Journal of Nutrition
Jean-Marc Vallier, Cyrille Mazure, Christophe Hausswirth, Thierry Bernard, Jeanick Brisswalter
The aim of the present study was to investigate the variability of the energy cost of running (Cr) during a simulated duathlon performed in outdoor conditions by elite duathletes. This duathlon consisted of 5 km of running, 30 km of cycling, and 5 km of running. The main result was the lack of significant difference in Cr between the two running bouts (210 +/- 10 mL d' vs. 217 +/- 10 mL d' This result is different from those observed during a triathlon, where an increase of energy cost of running bout has been reported...
October 2003: Canadian Journal of Applied Physiology, Revue Canadienne de Physiologie Appliquée
Pedro Tauler, Antoni Aguiló, Isabel Gimeno, Aina Noguera, Alvar Agustí, Josep A Tur, Antoni Pons
We have determined the effects of chronic vitamin C intake on neutrophil and lymphocyte antioxidant defences during the acute phase immune response induced by intense exercise. Blood samples were taken from 16 voluntary athletes in basal conditions, both immediately after and 1 h after a duathlon competition. Sportsmen's nutrient intakes were determined before the competition. After determining the basal plasmatic ascorbate levels, the results were analysed taking into account the vitamin C intake and their plasmatic levels...
September 2003: Free Radical Research
Stephane Palazzetti, Marie-Jeanne Richard, Alain Favier, Irene Margaritis
We hypothesized that overloaded training (OT) in triathlon would induce oxidative stress and damage on muscle and DNA. Nine male triathletes and 6 male sedentary subjects participated in this study. Before and after a 4-week OT, triathletes exercised for a duathlon. Blood ratio of reduced vs. oxidized glutathione (GSH/GSSG), plasma thiobarbituric acid reactive substances (TBARS), leukocyte DNA damage, creatine kinase (CK), and CK-MB mass in plasma, erythrocyte superoxide dismutase (SOD) activity, erythrocyte and plasma glutathione peroxidase (GSH-Px) activities, and plasma total antioxidant status (TAS) were measured before and after OT in pre- and postexercise situations...
August 2003: Canadian Journal of Applied Physiology, Revue Canadienne de Physiologie Appliquée
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