Lactate profiles in blood and sweat during exercise and heat induced sweating
Blood lactate levels and sweat lactate excretion were determined during exercise and subsequently during heat induced sweating, in the same subjects in an attempt to investigate the contribution of blood lactate to the sweat lactate excretion. Eighteen male volunteers of ages 15- 32 participated i...
| Main Authors: | , , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
1999
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| Online Access: | http://eprints.usm.my/42374/ http://eprints.usm.my/42374/1/GP...Lactate_Profiles_In_Blood_And_Sweat_During_Exercise_And_Heat_Induced_Sweating..OCR...pdf |
| _version_ | 1848879542291136512 |
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| author | Sirisinghe, R.G. Singh, Rabindarjeet Singh, Harbindar Jeet |
| author_facet | Sirisinghe, R.G. Singh, Rabindarjeet Singh, Harbindar Jeet |
| author_sort | Sirisinghe, R.G. |
| building | USM Institutional Repository |
| collection | Online Access |
| description | Blood lactate levels and sweat lactate excretion were determined during exercise and subsequently during heat
induced sweating, in the same subjects in an attempt to investigate the contribution of blood lactate to the sweat
lactate excretion. Eighteen male volunteers of ages 15- 32 participated in the study. Exercise was performed on a cycle ergometer and involved a stepwise increase in workload until exhaustion. A passenger van with shutters
up parked in the afternoon sun was used to create a warm environment-for heat-induced sweating. Both exercise (0.017 ± 0.001 L/min/m2) and the warm environment (0.013 ± 0.001 /min/m2) induced comparable rates of sweating. Pretest blood lactate levels were similar before exercise (2.2 ± 0.16 mmol/L) and heat test (1.9 ± 0.12 mmol/L). However, blood lactate levels during exercise (10.4 ± 0.42 mmol/L) were significant higher than levels during heat induced sweating (1.9 ± 0.10 mmol/L) (P < 0.001). Sweat lactate
excretion during exercise (1.03 ± 0.11 mmol/min/m2) was significantly greater than sweat lactate excretion during
heat induced sweating, (0.54 ± 0.04 mmol/min/m2) in spite of comparable volumes of sweat production.During heat induced sweating, sweat lactate excretion increased with increased sweat rates and the correlation a significant
(r • 0.48) (p < 0.001). These results demonstrate that raised blood lactate levels during exercise contribute significantly to sweat lactate excretion. Sweat gland metabolism also contributes to sweat lactate excretion.The results cannot quantify the relative contributions of these two factors. Such quantification will necessitate further studies in the future. Whatever these respective contributions may be, sweat lactate excretion is probably not a sufficiently reliable index of aerobic capacity, to be recommended as a routine measurement because of its variability with varying sweat gland metabolism. |
| first_indexed | 2025-11-15T17:48:53Z |
| format | Conference or Workshop Item |
| id | usm-42374 |
| institution | Universiti Sains Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T17:48:53Z |
| publishDate | 1999 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | usm-423742020-03-20T04:32:06Z http://eprints.usm.my/42374/ Lactate profiles in blood and sweat during exercise and heat induced sweating Sirisinghe, R.G. Singh, Rabindarjeet Singh, Harbindar Jeet R5-920 Medicine (General) Blood lactate levels and sweat lactate excretion were determined during exercise and subsequently during heat induced sweating, in the same subjects in an attempt to investigate the contribution of blood lactate to the sweat lactate excretion. Eighteen male volunteers of ages 15- 32 participated in the study. Exercise was performed on a cycle ergometer and involved a stepwise increase in workload until exhaustion. A passenger van with shutters up parked in the afternoon sun was used to create a warm environment-for heat-induced sweating. Both exercise (0.017 ± 0.001 L/min/m2) and the warm environment (0.013 ± 0.001 /min/m2) induced comparable rates of sweating. Pretest blood lactate levels were similar before exercise (2.2 ± 0.16 mmol/L) and heat test (1.9 ± 0.12 mmol/L). However, blood lactate levels during exercise (10.4 ± 0.42 mmol/L) were significant higher than levels during heat induced sweating (1.9 ± 0.10 mmol/L) (P < 0.001). Sweat lactate excretion during exercise (1.03 ± 0.11 mmol/min/m2) was significantly greater than sweat lactate excretion during heat induced sweating, (0.54 ± 0.04 mmol/min/m2) in spite of comparable volumes of sweat production.During heat induced sweating, sweat lactate excretion increased with increased sweat rates and the correlation a significant (r • 0.48) (p < 0.001). These results demonstrate that raised blood lactate levels during exercise contribute significantly to sweat lactate excretion. Sweat gland metabolism also contributes to sweat lactate excretion.The results cannot quantify the relative contributions of these two factors. Such quantification will necessitate further studies in the future. Whatever these respective contributions may be, sweat lactate excretion is probably not a sufficiently reliable index of aerobic capacity, to be recommended as a routine measurement because of its variability with varying sweat gland metabolism. 1999 Conference or Workshop Item NonPeerReviewed application/pdf en http://eprints.usm.my/42374/1/GP...Lactate_Profiles_In_Blood_And_Sweat_During_Exercise_And_Heat_Induced_Sweating..OCR...pdf Sirisinghe, R.G. and Singh, Rabindarjeet and Singh, Harbindar Jeet (1999) Lactate profiles in blood and sweat during exercise and heat induced sweating. In: Lactate profiles in blood and sweat during exercise and heat induced sweating. (Submitted) |
| spellingShingle | R5-920 Medicine (General) Sirisinghe, R.G. Singh, Rabindarjeet Singh, Harbindar Jeet Lactate profiles in blood and sweat during exercise and heat induced sweating |
| title | Lactate profiles in blood and sweat during exercise and heat induced sweating |
| title_full | Lactate profiles in blood and sweat during exercise and heat induced sweating |
| title_fullStr | Lactate profiles in blood and sweat during exercise and heat induced sweating |
| title_full_unstemmed | Lactate profiles in blood and sweat during exercise and heat induced sweating |
| title_short | Lactate profiles in blood and sweat during exercise and heat induced sweating |
| title_sort | lactate profiles in blood and sweat during exercise and heat induced sweating |
| topic | R5-920 Medicine (General) |
| url | http://eprints.usm.my/42374/ http://eprints.usm.my/42374/1/GP...Lactate_Profiles_In_Blood_And_Sweat_During_Exercise_And_Heat_Induced_Sweating..OCR...pdf |