Blood Lactate and Heat Stress during Training

[igoeja]

Although I imagine most serious fitness people realize this, its a timely reminder to keep ventilated when working out indoors.

From PubMed:

Int J Sports Med. 2007 May 24;
[Epub ahead of print]

Maciejewski H, Messonnier L, Moyen B, Bourdin M.

Laboratory of Biomechanics and Human Modelling, Faculty of Medicine Lyon-Sud, Oullins cedex, France.

The purpose of the present study was to test the hypothesis that large increases in blood lactate concentration ([La] (b)) and/or body temperature may occur during an endurance training on a rowing ergometer and disrupt training. The influence of an increase in air convection on the capacity to perform a prolonged exercise was also explored. Ten trained oarsmen were asked to undergo twice, in control (C) and increased air ventilation (AV) conditions, two 30-min trainings on a rowing ergometer at a work rate corresponding to 2.5 mmol . L (-1) of [La] (b) determined during a previous incremental exercise (P (2.5)). Four subjects did not complete the training session in C despite a steady state in [La] (b) in two of them. In these four subjects, the end of the exercise was associated with the highest measured rectal temperatures (T (re), 39.4 +/- 0.1 degrees C) and rate of perceived exertion (RPE, 17.8 +/- 0.3). Regarding the six other subjects, their heart rate, oxygen uptake, RPE, T (re) and water loss values were lower (p < 0.05) in AV than in C. [La] (b) displayed the same profile in C and AV. This study suggests that i) high body temperature may constitute a significant factor of perceived exertion and disrupt indoor training session, and ii) capacity to perform an endurance training on a rowing ergometer was improved by increasing air convection.

[jjpisano]

Not only ventilated but cooled. There was a recent article in Wired magazine about cooling the body through the palms and soles. It helped endurance considerably. If the ideas in that article can be commercially exploited, I bet there would be lots of customers. The article can be seen at:

http://www.wired.com/wired/archive/15.0 ... topic_set=

There are alot of smart people who read this web site and there are a lot of people who want to improve there endurance; perhaps, some of them can possible design a system we ergers can use to improve our endurance and train more effectively.

I am particularly mindful of the cooling problem as the summer heat starts to build.