Core Temperature and Maximal Oxygen Uptake During Exercise in the Heat: Implications for Exercise Prescription

 
9783639137019: Core Temperature and Maximal Oxygen Uptake During Exercise in the Heat: Implications for Exercise Prescription
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This work measured maximal oxygen uptake (VO2max) and core temperature (TC) at exhaustion, and oxygen uptake and heart rate during submaximal exercise in 22 runners under 7 conditions. The conditions were: 1) 25 degrees C (dC), no preheating; 2-4 and 6) 25, 35, 40, and 45 dC, with preheating by a 20-min walk; 5) 45 dC, no preheating; and 7) 45 dC, with passive preheating raising TC to the same degree as at the end of the 20-min walk in Condition 6. Compared to the Condition 1, VO2max was reduced 3-9% under Conditions 2-5 when TC at VO2max was below the apparent critical TC, but was reduced 17-19% under Conditions 6-7 when a critical TC appeared to have been attained. Heart rate and relative metabolic intensity (%VO2max) during submaximal exercise increased in an identical fashion in the heat, and the elevations in heart rate were significantly related to the reductions in VO2max (r = 0.79). It was concluded that large reductions in VO2max in uncompensable heat stress are associated with attainment of a critical TC. Elevation in heart rate during submaximal exercise in the heat is proportional to reduced VO2max, and not indicative of dissociation between heart rate and %VO2max.

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The Icelander Sigurbj÷rn ┴rni ArngrÝmsson received his Ph.D. in Excercise Physiology from the University of Georgia under the guidance of Dr Kirk J. Cureton. He has published papers on Environmental Physiology and Body Composition. He has also competed on the National Team in Athletics and is multiple National Champion in 800 and 1500 m runs.

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Arngrímsson, Sigurbjörn Á.
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Book Description Condition: New. Publisher/Verlag: VDM Verlag Dr. Müller | Implications for Exercise Prescription | This work measured maximal oxygen uptake (VO2max) andcore temperature (TC) at exhaustion, and oxygenuptake and heart rate during submaximal exercise in22 runners under 7 conditions. The conditions were:1) 25 degrees C (dC), no preheating; 2-4 and 6) 25,35, 40, and 45 dC, with preheating by a 20-min walk;5) 45 dC, no preheating; and 7) 45 dC, with passivepreheating raising TC to the same degree as at theend of the 20-min walk in Condition 6. Compared tothe Condition 1, VO2max was reduced 3-9% underConditions 2-5 when TC at VO2max was below theapparent critical TC, but was reduced 17-19% underConditions 6-7 when a critical TC appeared to havebeen attained. Heart rate and relative metabolicintensity (%VO2max) during submaximal exerciseincreased in an identical fashion in the heat, andthe elevations in heart rate were significantlyrelated to the reductions in VO2max (r = 0.79). Itwas concluded that large reductions in VO2max inuncompensable heat stress are associated withattainment of a critical TC. Elevation in heart rateduring submaximal exercise in the heat isproportional to reduced VO2max, and not indicative ofdissociation between heart rate and %VO2max. | Format: Paperback | Language/Sprache: english | 144 pp. Seller Inventory # K9783639137019

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Book Description VDM Verlag Apr 2009, 2009. Taschenbuch. Condition: Neu. This item is printed on demand - Print on Demand Neuware - This work measured maximal oxygen uptake (VO2max) and core temperature (TC) at exhaustion, and oxygen uptake and heart rate during submaximal exercise in 22 runners under 7 conditions. The conditions were: 1) 25 degrees C (dC), no preheating; 2-4 and 6) 25, 35, 40, and 45 dC, with preheating by a 20-min walk; 5) 45 dC, no preheating; and 7) 45 dC, with passive preheating raising TC to the same degree as at the end of the 20-min walk in Condition 6. Compared to the Condition 1, VO2max was reduced 3-9% under Conditions 2-5 when TC at VO2max was below the apparent critical TC, but was reduced 17-19% under Conditions 6-7 when a critical TC appeared to have been attained. Heart rate and relative metabolic intensity (%VO2max) during submaximal exercise increased in an identical fashion in the heat, and the elevations in heart rate were significantly related to the reductions in VO2max (r = 0.79). It was concluded that large reductions in VO2max in uncompensable heat stress are associated with attainment of a critical TC. Elevation in heart rate during submaximal exercise in the heat is proportional to reduced VO2max, and not indicative of dissociation between heart rate and %VO2max. 144 pp. Englisch. Seller Inventory # 9783639137019

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Book Description VDM Verlag, 2009. Paperback. Condition: New. Language: English . Brand New Book. This work measured maximal oxygen uptake (VO2max) and core temperature (TC) at exhaustion, and oxygen uptake and heart rate during submaximal exercise in 22 runners under 7 conditions. The conditions were: 1) 25 degrees C (dC), no preheating; 2-4 and 6) 25, 35, 40, and 45 dC, with preheating by a 20-min walk; 5) 45 dC, no preheating; and 7) 45 dC, with passive preheating raising TC to the same degree as at the end of the 20-min walk in Condition 6. Compared to the Condition 1, VO2max was reduced 3-9 under Conditions 2-5 when TC at VO2max was below the apparent critical TC, but was reduced 17-19 under Conditions 6-7 when a critical TC appeared to have been attained. Heart rate and relative metabolic intensity ( VO2max) during submaximal exercise increased in an identical fashion in the heat, and the elevations in heart rate were significantly related to the reductions in VO2max (r = 0.79). It was concluded that large reductions in VO2max in uncompensable heat stress are associated with attainment of a critical TC. Elevation in heart rate during submaximal exercise in the heat is proportional to reduced VO2max, and not indicative of dissociation between heart rate and VO2max. Seller Inventory # KNV9783639137019

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