This study aimed to assess the effect of portable gas analysis system carriage on energy expenditure (EE) during incremental treadmill running. Eight males (Mean � SD) age 25.0 � 9.47 y, body mass 78.5 � 8.39 kg, completed an experimental trial (PT) during which they wore the system in a chest harness and a control trial (CT) when the system was externally supported. Each protocol consisted of 4 min stages at speeds of 0, 4, 7, 10, 12, 14 km h�1. Increments continued until volitional exhaustion. The EE was greater (3.95 and 7.02% at 7 and 14 km h�1 respectively) during PT (p < 0.05) but no significant differences were observed during standing, walking or VO2max. (4.10 � 0.53, and 4.28 � 0.75 l min�1 for CT and PT respectively), HR or RPE. Portable gas analysis systems therefore only increase EE when running sub-maximally, but VO2max is unaffected, suggesting that using portable gas analysis systems in field-based situations is appropriate for maximal aerobic capacity measurement, but the effects of prolonged use on EE remains unclear.
- Exercise Energy expenditure VO2max