dc.contributor |
Richardson, Mark T. |
|
dc.contributor |
Bishop, Phillip A. |
|
dc.contributor |
Mansfield, Edward R. |
|
dc.contributor |
Vincent, John B. |
|
dc.contributor.advisor |
Wingo, Jonathan E. |
|
dc.contributor.author |
Al-horani, Ramzi Ahmad |
|
dc.date.accessioned |
2017-03-01T17:22:05Z |
|
dc.date.available |
2017-03-01T17:22:05Z |
|
dc.date.issued |
2014 |
|
dc.identifier.other |
u0015_0000001_0001808 |
|
dc.identifier.other |
Alhorani_alatus_0004D_12212 |
|
dc.identifier.uri |
https://ir.ua.edu/handle/123456789/2252 |
|
dc.description |
Electronic Thesis or Dissertation |
|
dc.description.abstract |
The aim of this study was to investigate the separate and combined effects of precooling and warm-up on a subsequent cycling time trial in a hot environment. METHODS: Nine healthy men (mean±SD age=24±5 years; body mass=74.7±4.5 kg; height=171.4±7.7 cm; body fat=12.9±5.2%) completed 3 simulated 16.1-km time trials on a cycle ergometer in a hot environment (~33 °C, 45% relative humidity) after: 1) 20 min of fluid ingestion (10 °C ) followed by 30 min of ice-slurry ingestion (-1 °C ) coupled with ice-vest (PREC), 2) 30 min of ice-slurry ingestion coupled with ice-vest followed by 20 min of warm-up including ice-slurry and ice-vest (COMBO), 3) 30 min of fluid ingestion (10 °C) followed by 20 min of warm-up (WU). RESULTS: At baseline, rectal temperature (T_re ), mean skin temperature ( ₸_sk ), and mean body temperature (₸_b ) were similar among treatments (all P>0.05). After treatment administration and before the start of the time trial, T_re was lower in PREC (36.1±0.3) and COMBO (36.9±0.4) compared to WU (37.6±0.2) (all P<0.05). ₸_sk and ₸_b were all lower in PREC than COMBO and WU, and were lower in COMBO than WU (all P<0.05). Tre remained lower in PREC than WU throughout exercise and was lower in PREC than COMBO for the first 12 km (all P<0.01), while T_re in COMBO remained lower than WU for the first 4 km. ₸_sk during PREC was lower than COMBO at 4 and 8 km and lower than WU at 0 and 4 km, while during COMBO it was lower than WU at 0 and 4 km (all P<0.05). Heart rate (HR) at baseline was lower in PREC than COMBO and WU (68±10, 106±12, 101±13 beats/min, respectively; P<0.001). During exercise, HR increased similarly among all treatments throughout exercise (all P>0.05). Local sweat rate (SR) was lower in PREC than COMBO and WU for the first 4 km (P < 0.05), but whole-body SR was not different among treatments (all P>0.05). Performance times were not different among treatments (PREC: 31.96±2.05 min; COMBO: 32.64±2.90 min; WU: 33.09±3.09 min; P>0.05). CONCLUSION: Despite mitigating thermal strain during exercise, precooling alone, or combined with warm-up, did not result in improved performance of a 16.1-km simulated cycling time trial. |
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dc.format.extent |
73 p. |
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dc.format.medium |
electronic |
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dc.format.mimetype |
application/pdf |
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dc.language |
English |
|
dc.language.iso |
en_US |
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dc.publisher |
University of Alabama Libraries |
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dc.relation.ispartof |
The University of Alabama Electronic Theses and Dissertations |
|
dc.relation.ispartof |
The University of Alabama Libraries Digital Collections |
|
dc.relation.hasversion |
born digital |
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dc.rights |
All rights reserved by the author unless otherwise indicated. |
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dc.subject.other |
Kinesiology |
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dc.title |
Precooling and warm-up effects on time trial cycling performance during heat stress |
|
dc.type |
thesis |
|
dc.type |
text |
|
etdms.degree.department |
University of Alabama. Dept. of Kinesiology |
|
etdms.degree.discipline |
Human Performance |
|
etdms.degree.grantor |
The University of Alabama |
|
etdms.degree.level |
doctoral |
|
etdms.degree.name |
Ph.D. |
|