Biology - HOT Science Lab

Student
a. Tap the data point that represents the heart rate immediately prior to squatting and
record the time component of this point.
b. Tap the point that represents the maximum or minimum heart rate (first peak or
valley) that follows squatting and record the time component of this point.
17. Determine the difference between the two time values, ∆x, and record this value in Table
3 (to the nearest whole number) as ―Response time 1.‖
18. Repeat Step 10 for the following regions:
a. From the maximum or minimum heart rate following squatting to the beginning of a
new stable heart rate. Record the ∆x value (time) in Table 3 as ―Recovery time 1.‖
b. The region just prior to standing and the maximum heart rate after standing. Record
the ∆x value (time) in Table 2 as ―Response time 2.‖
c. The region between the maximum heart rate after standing and the point at which the
heart rate has re-stabilized (i.e., stable for at least 40 s). Record the ∆x value (time) in
Table 3 as ―Recovery time 2.‖
Observations/Data:
Table 1 - Exercise
Resting Heart Rate (bpm) Maximum Heart Rate (bpm) Recovery Time (s)
Table 2 – Baroreceptor Stimuli
Baseline Heart Rate (bpm) Minimum Heart Rate (bpm) Maximum Heart Rate (bpm)
Baroreceptor
response time 1:
Squatting (s)
Table 3 – Baroreceptor Stimuli
Baroreceptor
Recovery time 1 (s) response time 2:
Standing (s)
Recovery time 2 (s)
Data Analysis/Results:
Exercise:
1. Normal resting heart rates range from 55−100 beats per minute. What was the subject‘s
resting heart rate How much did the subject‘s heart rate increase above resting rate with
exercise What percent increase was this
2. How does the subject‘s maximum heart rate compare with other students in the group or
class Is this what you expected
3. Recovery time has been shown to correlate with degree of physical fitness. How does the
subject‘s recovery rate compare to that of your classmates Is this what you expected
4. Congestive heart failure is a condition in which the strength of contraction with each beat
may be significantly reduced. For example, the ventricle may pump only half the usual
Biology HSL Page 285
Curriculum and Instruction