Millions of people in the world jog for exercise. For the most part, jogging can be a healthy way to stay fit. However, problems can also develop for those who jog in the heat. Excessive sweating can lead to electrolyte loss that could be life-threatening. Early symptoms of electrolyte deficiency can include nausea, fatugue, and dizziness. If not treated, individuals can experience muscle weakness and increased heart rate (which could lead to a heart attack). Many sports drinks can be consumed to restore electrolytes quickly in the body.
Context:
The Jones family went jogging  last Saturday. The weather was great for running, a bit chilly. The Brown family went jogging on Sunday and the weather was hot and humid, so it was tough for them, plus they forgot their Gatorade at home.
Q: Which family did not experience an increased heart rate as a result of electrolyte deficiency?