Impact of Physical Load on Aerobic Exercise Performance during Heat Stress.

Heavy external loads and heat exposure can negatively impact exercise performance. Independent effects of heat and load have been studied previously; however the combined effects remain unknown. Purpose: To investigate the impact of increasing external loads on 5 km treadmill time trial (TT) performance in 20[degrees]C (Temp) and 40[degrees]C (Hot) environmental conditions and to construct an ecologically relevant performance prediction decision-aid. Methods: 26 male and 4 female volunteers (age 23.5 +/- 6.9 years, weight 76.0 +/- 8.9 kg, height 1.75 +/- 0.07 m; VO2peak, 50.7 +/- 4.5 ml/kg/min) participated in a counter-balanced, mixed model design with each subject assigned to a load group (20%, 30%, or 50% body mass (BM); n=10 per group). Volunteers performed 3, self-paced 5km familiarization time trials (TT) (treadmill) without external load. Each volunteer then performed a 5 km TT in each environment with loads of either 20% (n=10), 30% (n=10) or 50% (n=10) body weight. Results: 1) loads of (20%, 30% and 50% of BM) impaired 5 km TT performance compared that when unloaded (P

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