ORCID Profile
0000-0002-2658-9787
Current Organisation
University of South Australia
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Elsevier BV
Date: 12-2015
Publisher: Human Kinetics
Date: 2020
Abstract: Purpose : To investigate the effect of a 5-day short-term heat acclimation (STHA) protocol in dry (43°C and 20% relative humidity) or humid (32°C and 80% relative humidity) environmental conditions on endurance cycling performance in temperate conditions (21°C). Methods : In a randomized, cross-over design, 11 cyclists completed each of the two 5-day blocks of STHA matched for heat index (44°C) and total exposure time (480 min), separated by 30 days. Pre- and post-STHA temperate endurance performance (4-min mean maximal power, lactate threshold 1 and 2) was assessed in addition, a heat stress test was used to assess in idual levels of heat adaptation. Results : Differences in endurance performance were unclear. Following dry STHA, gross mechanical efficiency was likely reduced (between-condition effect size dry vs humid −0.59 90% confidence interval, −1.05 to −0.15), oxygen uptake was likely increased for a given workload (0.64 [0.14 to 1.07]), and energy expenditure likely increased (0.59 [0.17 to 1.03]). Plasma volume expansion at day 5 of acclimation was similar (within-condition outcome 4.6% [6.3%] and 5.3% [5.1%] dry and humid, respectively) but was retained for 3 to 4 days longer after the final humid STHA exposure (−0.2% [8.1%] and 4.5% [4.2%] dry and humid, respectively). Sweat rate was very likely increased during dry STHA (0.57 [0.25 to 0.89]) and possibly increased (0.18 [−0.15 to 0.50]) during humid STHA. Conclusion : STHA induced ergent adaptations between dry and humid conditions, but did not result in differences in temperate endurance performance.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2018
Publisher: Informa UK Limited
Date: 30-12-2022
DOI: 10.1080/17461391.2022.2150896
Abstract: This evaluated relationships between changes in training load, haematological responses, and endurance exercise performance during temperate and heat acclimation (HA) training preceding a male team cycling pursuit world record (WR). Haemoglobin mass (Hb
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 16-08-2022
DOI: 10.1249/MSS.0000000000003028
Abstract: This study aimed to characterize the thermal and cardiovascular strain of professional cyclists during the 2019 Tour Down Under and determine the associations between thermal indices and power output, and physiological strain. Gastrointestinal temperature ( T gi ), heart rate (HR), and power output were recorded during the six stages (129–151.5 km) of the Tour Down Under in ≤22 male participants. Thermal indices included dry-bulb, black-globe, wet-bulb, and wet-bulb-globe (WBGT) temperature relative humidity (RH), Heat Index Humidex and universal thermal climate index. The heat stress index (HSI), which reflects human heat strain, was also calculated. Dry-bulb temperature was 23°C–37°C, and RH was 18%–72% (WBGT: 21°C–29°C). Mean T gi was 38.2°C–38.5°C, and mean peak T gi was 38.9°C–39.4°C, both highest values recorded during stage 3 (WBGT: 27°C). Peak in idual T gi was ≥40.0°C in three stages and ≥39.5°C in 14%–33% of cyclists in five stages. Mean HR was 131–147 bpm (68%–77% of peak), with the highest mean recorded in stage 3 ( P ≤ 0.005). Mean power output was 180–249 W, with the highest mean recorded during stage 4 ( P 0.001 21°C WBGT). The thermal indices most strongly correlated with power output were black-globe temperature ( r = −0.778), RH ( r = 0.768), universal thermal climate index ( r = −0.762), and WBGT ( r = −0.745 all P 0.001). Mean T gi was correlated with wet-bulb temperature ( r = 0.495), HSI ( r = 0.464), and Humidex ( r = 0.314 all P 0.05), whereas mean HR was most strongly correlated with HSI ( r = 0.720), along with T gi ( r = 0.599) and power output ( r = 0.539 all P 0.05). Peak T gi reached 40.0°C in some cyclists, although most remained .5°C with an HR of ~73% of peak. Power output was correlated with several thermal indices, primarily influenced by temperature, whereas T gi and HR were associated with the HSI, which has potential for sport-specific heat policy development.
No related grants have been discovered for Sam Tebeck.