An apparatus for collecting exhaled volume at different intervals that appears to use weather balloons. From Hake M, Michael ED. “The physiological costs of box lifting”. J Human Ergol. 1977, Volume 6, page 168.
An apparatus for collecting exhaled volume at different intervals that appears to use weather balloons. From Hake M, Michael ED. “The physiological costs of box lifting”. J Human Ergol. 1977, Volume 6, page 168.