In school, students use different writing implements (ie #2 pencil, ballpoint pen, laptop) for assignments. Some of these are less effective than others and tire the students more quickly when a long assignment must be completed. We wondered how we could test which method is the most effective to use.
Then an experiment was developed. We used the Logger Pro program and the Vernier Handy Dynamometer sensor to test which activities were the most tiring to hand muscles. Muscles need oxygen in order to produce ATP, the energy source. However, if muscles are worked too hard or for too long, they cannot get oxygen quickly enough. With oxygen, the cells go through aerobic respiration. Without oxygen, cells go through anaerobic respiration or fermentation, which are less efficient and produce soreness (from lactic acid). In addition, muscles become sore after hard workouts due to DOMS (Delayed Onset Muscle Soreness). During extreme workouts, the muscles began to tear in microscopic areas. Afterwards, while the muscles rest, they rebuild and are sore due to DOMS during this time.
Then an experiment was developed. We used the Logger Pro program and the Vernier Handy Dynamometer sensor to test which activities were the most tiring to hand muscles. Muscles need oxygen in order to produce ATP, the energy source. However, if muscles are worked too hard or for too long, they cannot get oxygen quickly enough. With oxygen, the cells go through aerobic respiration. Without oxygen, cells go through anaerobic respiration or fermentation, which are less efficient and produce soreness (from lactic acid). In addition, muscles become sore after hard workouts due to DOMS (Delayed Onset Muscle Soreness). During extreme workouts, the muscles began to tear in microscopic areas. Afterwards, while the muscles rest, they rebuild and are sore due to DOMS during this time.
The goal was to see which method of writing would be the least tiring when taking notes or writing an essay, for instance. Each test subject engaged in one of the following activities for 2 minutes with their dominant hand: nothing (for reference), writing with a ballpoint pen, writing with a #2 pencil, typing, and hand exercises (stretching out your hand repeatedly, just as a slight addition to the main question). Then, the Dynamometer was used to test the amount of force their dominant hand could exert by squeezing with the hardest force and holding for 2-3 seconds, then slowly releasing. The amount of force the test subject would be able to exert on the sensor is inversely proportional to the amount of energy the activity will consume, so the activities with high force would be the least tiring while the activities with low force would be the most tiring. Initially, we guessed that the order of force would be (from highest to lowest or least tiring to most tiring):
* nothing (for reference)
1. hand exercises
2. typing
3. writing with a ballpoint pen
4. writing with a #2 pencil.
We had three test subjects, and each of their data graphs are presented below.
*Note: units - x-axis: time in seconds
y-axis: force in newtons
Subject 1: Sabrina
For this test subject, the order of effectiveness was:
*nothing (for reference)
1. typing
2. hand exercises
3. #2 pencil
4. ballpoint pen
Subject 2: Cindy
For this test subject, the order of effectiveness was:
*nothing (for reference)
1. typing
2. ballpoint pen
3. #2 pencil
4. hand exercises
Subject 3: Catherine
For this test subject, the order of effectiveness was:
1. hand exercises
2. ballpoint pen
3. #2 pencil
4. typing
*nothing (for reference)
This test subject had surprising results, and we suspect that her data was not recorded correctly or that some error occurred while conducting her tests.
Overall (on average), the order of activities (least to most tiring) was:
* nothing (just for reference)
1. typing
2. writing with #2 pencil
3. writing with ballpoint pen
4. hand exercises
