th
nbnv74
80

MEANS
9
10
11
7
8
5
6
3
4
1
2
Subject Frequency 40/min (Sec) Frequnecy 70/min (Sec) Frequency 100/min (Sec) Static Hold (Sec)
26
27
24
150
150
150
150
150
94
53
48
69
66 25.7
84
47.5
57
74
73
37
78
104
73
100
114
76.5

160
140
120
100
80
60
40
20
0
40 70 100
Frequency (per minute)
Figure 4.1 The Average Time To Muscle Fatigue in Hand Gripping
Static

Relationship between gripping rates including static and time to fatigue
The relationship between gripping rates and time to muscle fatigue changes with the frequency of gripping. When the frequency of muscle contraction and relaxation was at 40/min., there is a time period where your muscle relaxes, allowing oxygenated blood to flow to the muscles being used. This increases the time that one can continue the contraction and relaxation period. The bar graph represents this well because it is our highest recorded time period. When the frequency was set at
70/min., muscle fatigue was reached much quicker than the 40/min. group. This increased rate of contraction and relaxation results in a moderate rate of muscle fatigue in comparison to the two other groups. This occurs because the muscle has less time to fully relax and then contract again. As the rate of gripping continues to increase to 100/min., we quickly recognize the significant decrease in time.
When contracting and relaxing your muscles at such a high rate, your muscles don’t have enough time to fully relax before you need to contract again so blood flow to your hand is almost non-existent. This lack of blood flow will fatigue your muscles much quicker due to the lack of nutrients and oxygen that provides the energy to contract your hand/finger muscle. You don’t’ give your muscles enough time to produce the energy needed to continue contracting and relaxing your muscles, therefore you cannot continue producing the required hand grip. The static grip results in the constriction of the blood vessels, reducing the blood flow to your hand muscles, resulting in muscle fatigue. This muscle fatigue responds slower because you do not require energy to move your hand.