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The association between lean body ma...

Quintana, Roberto.

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The association between lean body mass, lactate threshold and the decrement in VO2 max during hypobaric hypoxia in well trained cyclists.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	The association between lean body mass, lactate threshold and the decrement in VO2 max during hypobaric hypoxia in well trained cyclists./
作者:	Quintana, Roberto.
面頁冊數:	68 p.
附註:	Chair: Robert A. Robergs.
Contained By:	Dissertation Abstracts International63-02B.
標題:	Biology, Animal Physiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3041979
ISBN:	0493555803

The association between lean body mass, lactate threshold and the decrement in VO2 max during hypobaric hypoxia in well trained cyclists.
Quintana, Roberto.

The association between lean body mass, lactate threshold and the decrement in VO2 max during hypobaric hypoxia in well trained cyclists. - 68 p.

Chair: Robert A. Robergs.

Thesis (Ph.D.)--The University of New Mexico, 2002.

The purpose of this study was to investigate determinants of maximum exercise capacity by examining the variance in the decrement in sea level VO2max (SL-VO2max) with hypobaric hypoxia (HH) in trained cyclists utilizing multiple regression (MR) analysis. The hypo/hyperbaric conditions consisted of 763, 568, and 486 Torr. The independent variables utilized in the MR analysis included the change in SaO2 with HH, hemoglobin concentration, (SL-VO2max) ventilation at VO2 max (VEmax), SL lactate threshold (SL-LT), lean body mass (LBM), leg volume, and gender. Male (n = 14) and female (n = 14) competitive cyclists, mean age = 28.79 yrs ± 5.6 yrs, with normal lung function, residential altitude (1640–2,460 m), and at least one year of competitive experience, completed 3 cycle ergometry VO2 max tests in a hypo/hyperbaric chamber under randomized blind conditions. VO2 decreased significantly with HH for both genders from 67.32 ± 5.69 ml/kg LBM/min at 763 Torr to 58.34 ± 5.30 ml/kg LBM/min at 568 Torr, and 50.87 ± 5.04 ml/kg LBM/min at 486 Torr. The average VO2 max decrement with HH was 8.6% per 100 mmHg. MR analysis indicated that LBM, leg volume, and VE max explained 73.4% of variance in the decrement in VO2max at 568 Torr. At 486 mm Hg, MR analysis revealed that (SL-VO2max) VEmax and SL-LT accounted for 78.45% for the variance in the decrement in VO2max Individuals with a small LBM (r = 0.76), large leg volume (r = −0.61) and large VEmax (r = −0.53) will have a smaller decrement in VO2 max at 568 Torr. At 486 Torr, individuals with a low (SL-VO2max) (r = 0.65), large VEmax (r = −0.62), and low SL-LT (r = 0.48) will have a smaller decrement in VO2max at 486 Torr. Our results indicate that the decrement in VO2max is dependent on a number of factors and these factors change with respect to the population and altitude. Across all altitudes, our data suggests that peripheral factors (LBM, leg volume and SL-LT) together with pulmonary (VE max) and central factors (SL-VO2max) explain a significant portion of the variance in the decrement in VO2max in trained cyclist acclimated to altitude.

ISBN: 0493555803Subjects--Topical Terms:

1017835
Biology, Animal Physiology.

The association between lean body mass, lactate threshold and the decrement in VO2 max during hypobaric hypoxia in well trained cyclists.
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245 1 0 $a The association between lean body mass, lactate threshold and the decrement in VO2 max during hypobaric hypoxia in well trained cyclists.
300 $a 68 p.
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500 $a Source: Dissertation Abstracts International, Volume: 63-02, Section: B, page: 0620.
502 $a Thesis (Ph.D.)--The University of New Mexico, 2002.
520 $a The purpose of this study was to investigate determinants of maximum exercise capacity by examining the variance in the decrement in sea level VO2max (SL-VO2max) with hypobaric hypoxia (HH) in trained cyclists utilizing multiple regression (MR) analysis. The hypo/hyperbaric conditions consisted of 763, 568, and 486 Torr. The independent variables utilized in the MR analysis included the change in SaO2 with HH, hemoglobin concentration, (SL-VO2max) ventilation at VO2 max (VEmax), SL lactate threshold (SL-LT), lean body mass (LBM), leg volume, and gender. Male (n = 14) and female (n = 14) competitive cyclists, mean age = 28.79 yrs ± 5.6 yrs, with normal lung function, residential altitude (1640–2,460 m), and at least one year of competitive experience, completed 3 cycle ergometry VO2 max tests in a hypo/hyperbaric chamber under randomized blind conditions. VO2 decreased significantly with HH for both genders from 67.32 ± 5.69 ml/kg LBM/min at 763 Torr to 58.34 ± 5.30 ml/kg LBM/min at 568 Torr, and 50.87 ± 5.04 ml/kg LBM/min at 486 Torr. The average VO2 max decrement with HH was 8.6% per 100 mmHg. MR analysis indicated that LBM, leg volume, and VE max explained 73.4% of variance in the decrement in VO2max at 568 Torr. At 486 mm Hg, MR analysis revealed that (SL-VO2max) VEmax and SL-LT accounted for 78.45% for the variance in the decrement in VO2max Individuals with a small LBM (r = 0.76), large leg volume (r = −0.61) and large VEmax (r = −0.53) will have a smaller decrement in VO2 max at 568 Torr. At 486 Torr, individuals with a low (SL-VO2max) (r = 0.65), large VEmax (r = −0.62), and low SL-LT (r = 0.48) will have a smaller decrement in VO2max at 486 Torr. Our results indicate that the decrement in VO2max is dependent on a number of factors and these factors change with respect to the population and altitude. Across all altitudes, our data suggests that peripheral factors (LBM, leg volume and SL-LT) together with pulmonary (VE max) and central factors (SL-VO2max) explain a significant portion of the variance in the decrement in VO2max in trained cyclist acclimated to altitude.
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