Question

question 3 (1.5 points)
to determine muscle fatigue, fast finger activity on writing and non - writing hand was conducted. every 30 sec, the results are provided below in table form. which conclusion is true?

1. number of squeezes the lowest at 120 seconds for both hands
2. earlier increased lactic acid build up is possible in writing hand than the non - writing hand
3. non - writing hand muscles fatigue slower than the writing hand muscles
4. earlier increased lactic acid build up is possible in the writing hand
5. earlier increased lactic acid build up is possible in non - writing hand than the writing hand

Explanation:

Step1: Analyze Option 1

For the non - writing hand, the number of squeezes at 90 sec is 10 (same as at 120 sec). So, the number of squeezes is not the lowest only at 120 sec for the non - writing hand.

Step2: Analyze Option 2

Lactic acid build - up causes muscle fatigue. The writing hand shows a steeper decline in the number of squeezes (from 25 at 30 sec to 20 at 60 sec, 15 at 90 sec, 10 at 120 sec) compared to the non - writing hand (from 18 at 30 sec to 15 at 60 sec, 10 at 90 sec, 10 at 120 sec). A steeper decline in activity (number of squeezes) implies earlier muscle fatigue (and thus earlier lactic acid build - up) in the writing hand.

Step3: Analyze Option 3

The writing hand (dominant) has a higher initial number of squeezes (25 at 30 sec) compared to the non - writing hand (18 at 30 sec). But the writing hand's activity (number of squeezes) decreases more rapidly. Muscle fatigue is indicated by a decrease in activity. Since the writing hand's activity decreases more rapidly, the non - writing hand muscles fatigue slower.

Step4: Analyze Option 4

As the writing hand shows a more rapid decline in the number of squeezes (an indicator of muscle fatigue which is related to lactic acid build - up), earlier increased lactic acid build - up is possible in the writing hand.

Step5: Analyze Option 5

Since the writing hand shows a more rapid decline in activity (number of squeezes) compared to the non - writing hand, option 5 is incorrect.

Answer:

1. Non - writing hand muscles fatigue slower than the writing hand muscles; 4) Earlier increased lactic acid build up is possible in the writing hand