Scientists investigated how exercise affects blood flow to different organs in the body.
The scientists made measurements of blood flow to different organs of:
 a person resting in a room at 20°C
 the same person, in the same room, doing vigorous exercise at constant speed
on an exercise cycle.
The table shows the scientists’ results.
organ|resting |doing vigorous exercise
Brain |750 |750
Heart 250 |1000
Muscles1200 22 000
Skin 500 600
Other 3100 650

Question

Scientists investigated how exercise affects blood flow to different organs in the body.
The scientists made measurements of blood flow to different organs of:
  a person resting in a room at 20°C
  the same person, in the same room, doing vigorous exercise at constant speed
on an exercise cycle.
 The table shows the scientists’ results.
organ|resting |doing vigorous exercise
Brain  |750     |750
Heart  250      |1000
Muscles1200  22 000
Skin  500 600
Other 3100 650

anonymous · Answer

In this investigation, it was better to do the exercise indoors on an exercise cycle than
to go cycling outdoors on the road.
Suggest two reasons why.
Do not include safety reasons.