Health and safety experts decided that wearing the suits might restrict driver vision and movement and increase fatigue.

Colossi, collisions and concussions are perennial headaches, and he suggested a limit of three tactical replacements to increase fatigue and, thus space.

Both teams created chances, during an extra time period marked by both teams increasing fatigue.

In addition, about 7% of subjects reported effects on their digestive systems, and about 12% had increased fatigue.