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Int J Sports Med 2011; 32(10): 749-753
DOI: 10.1055/s-0031-1277191
Training & Testing

© Georg Thieme Verlag KG Stuttgart · New York

Maximal Lactate Steady State is Altered in the Heat

C. L. M. de Barros1 , T. T. Mendes1 , 2 , L. Á. C. F. Mortimer1 , H. G. Simões3 , L. S. Prado1 , U. Wisloff4 , E. Silami-Garcia1
  • 1Federal University of Minas Gerais, School of Physical Education, Physiotherapy and Occupational Therapy, Belo Horizonte, Brazil
  • 2UNI-BH, Department of Environmental, Biological and Health Sciences, University Center of Belo Horizonte, Brazil
  • 3Catholic University of Brasilia, Department of Physical Education, Distrito Federal, Brazil
  • 4NTNU, Circulation and Medical Imaging, Trondheim, Norway
Further Information

Publication History

accepted after revision April 10, 2011

Publication Date:
17 May 2011 (online)

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Abstract

The aim of this study was to compare the maximal lactate steady state (MLSS) and ventilatory threshold (VT) under different environments (TEMP: 22°C; and HOT: 40°C; 50% RH). 8 male subjects (age 23.9±2.4 years, body mass 75.9±7.3 kg and VO2max 47.8±4.9 mL·kg−1·min−1) performed a series of tests to determine the peak workload (Wpeak), VT and MLSS on a cycle ergometer. Wpeak was higher in the TEMP as compared to the HOT condition (225±9 W vs. 195±8 W, respectively; p<0.05). The workload at MLSS was higher at 22°C (180±11 W) than 40°C (148±11 W; p<0.05), as well as VT at 22°C (156±9 W) was higher than 40°C (128±6 W). Likewise, the blood lactate concentration at MLSS was higher at 22°C (5.60±0.26 mM) than 40°C (4.22±0.48 mM; p<0.05). The mean of heart rate (HR) was not statistically different between TEMP (168±3 bpm) and HOT (173±3 bpm) at MLSS, despite being different at trials between the 25th and the 30th min of exercise. The HR at VT was significantly higher in HOT (153±4 bpm) as compared to the TEMP (145±2 bpm). Our results suggest that environmental conditions may influence the determination of MLSS and VT. Moreover, VT was appropriate for estimation of the workload at MLSS in the HOT.

Key words

maximal lactate steady state - heat stress - ventilatory threshold - blood lactate concentration - heart rate

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Correspondence

Cristiano Lino Monteiro de Barros

Federal University of Minas

Gerais

School of Physical Education,

Physiotherapy and

Occupational Therapy

Av Antônio Carlos 6627

31270-901 Belo Horizonte

Brazil

Phone: +55/31/92392234

Fax: +55/31/34092325

Email: cristianolino@yahoo.com.br

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