The 800 m trial on a hot, humid afternoon
During a Grade 8 co-educational PE period at a school in Nagpur, you run an 800 m time trial at 2:15 p.m. on a day when the temperature is 34 °C and humidity is about 70%. Priya, aged 13, has completed about 250 m when she stops, looking flushed and breathing very fast. She says she feels dizzy and has 'pins and needles' in her fingers. Her radial pulse is 186 beats per minute and she is sweating heavily. She tells you she skipped breakfast and ate nothing at lunch because she wanted to be 'light' for the run. She is anxious to continue because school team selection is next week. The nearest shaded area is 30 m away; you have water, a first-aid kit and a phone. Two other students in the group also look tired, and one has started coughing.
1. What is your immediate decision for Priya, and how do you distinguish a normal exercise response from warning signs in this scenario?
Read the worked answer
Decision: stop the trial now and do not let her continue.
- A pulse of 186 at age 13 is about 90% of the rough age-predicted maximum (220 − 13 = 207). That can be normal in a hard 800 m effort, and sweating and fast breathing are also expected.
- What is not expected is dizziness, tingling in the fingers, heavy sweating while fasting, and 34 °C with 70% humidity. These point to heat strain, possible low blood glucose and hyperventilation, any of which can progress to fainting.
- Normal response: recovery within 2–3 minutes of stopping, coherent speech, steady walking.
- Warning signs: confusion, vomiting, fainting, no improvement after 5–10 minutes, or symptoms at rest.
She has at least three warning features, so the safe judgement is to stop the effort, not to let her finish for the sake of selection.
2. What will you do in the next 10 minutes, and what physiological reason supports each action?
Read the worked answer
- Move her to shade and sit her down, legs slightly raised. Reduces heat load and helps blood return to the heart.
- Loosen clothing, fan her, give small sips of water. Because she skipped two meals, also give a glucose drink or a biscuit if she is fully conscious and can swallow - fasting lowers blood glucose, which contributes to dizziness.
- Slow her breathing by asking her to breathe in for 4 counts and out for 6. Tingling in the fingers is typical of hyperventilation, which lowers carbon dioxide; slow breathing reverses it.
- Check pulse, consciousness and skin every 5 minutes.
Do not give a large meal immediately, do not cool the whole body with ice, and do not send her home alone. If she vomits, becomes drowsy or does not recover, arrange medical help.
3. What will you change for the rest of the class, and what will you record?
Read the worked answer
- Move the trial to early morning, shorten it to 400–600 m with walk-run intervals, and give a water break every 15 minutes.
- Screen the group with two questions: have you eaten today, and do you feel unwell? Excuse anyone with symptoms.
- Pair students so they monitor each other, and keep the shaded area open.
Record the time, temperature and humidity, Priya's symptoms, pulse, actions taken, recovery time and who was informed. Inform the class teacher and parent, and note the conditions in the session plan.
The reasoning is that the session design created the risk; the two other tired students and the coughing student show it was environmental, not a single student's willpower.