Twitch Contractions and Summation

LABORATORY REPORT
(Click on the Save a Copy button on the panel above to save your report)

Activity: Name: Instructor: Date:

Activity to Twitch Contractions and Summation Katherine Taft Kathleen Charrey July 13, 2013

Predictions
1. During exercise HR will increase. 2. During exercise SV will increase. 3. During exercise CO will increase.

Materials and Methods
1. Dependent Variable EDV, ESV, and cardiac cycle length 2. Independent Variable level of physical activity(resting or exercise) 3. Controlled Variables age, weight, height 4. Identify one variable that was not controlled in this study (not dependent or independent variables; Hint: think about possible differences between subjects). I think the general health of the individuals was not established for this experiment.It is not clear as to weather any of them have any medical conditions such as asthma or similiar that could affect their outcomes.

Results Table 2: Resting and Exercising Cardiac Cycle Length, EDV, and ESV
Resting Values Exercising Values Cardiac EDV (mL) ESV (mL) Cardiac EDV (mL) ESV (mL) cycle length cycle length (msec) (msec) 823 140 65 397 139 37 838 136 72 384 144 33 850 143 67 414 140 35 140 68 141 35

Subject 1 Subject 2 Subject 3 Averages

Resting and Exercising HR, EDV andESV

Table 3: Resting and Exercising HR, SV and CO
HR (strokes per second) 73 72 71 72 Resting Values SV (mL) SV (L) 75 64 76 0.075 0.064 0.076 0.072 CO 5.5 4.6 5.4 5.2 HR (strokes per second) 151 156 145 151 Exercising Values SV (mL) SV (L) 102 111 105 0.102 0.111 0.105 0.106 CO 15.4 17.3 15.2 16

Subject 1 Subject 2 Subject 3 Averages

Resting and Exercising SV and CO

1. Does exercise increase, decrease, or not change EDV? The EDV did not appear to change.

2. Does exercise increase, decrease, or not change ESV? The ESV decreased output after exercising. 3. Does exercise increase,