## 3 Results  
The SEMG signal in this research is collected in three stages when lifting the right hand involving rotation of the elbow joint starting with flexion from \(\theta_{\text{ej}}=0^{\circ}\) to \(\theta_{\text{ej}}=90^{\circ}\) and then extension from \(\theta_{\text{ej}}=90^{\circ}\) to \(\theta_{\text{ej}}=0^{\circ}\). The first stage is the preparation stage from interval 0 to 1000 milliseconds (ms) without any movement only the subject prepares to next stage. In this stage, the angle stays \(\theta_{\text{ej}}=0^{\circ}\) for one 1000 milliseconds. The second stage is the start stage from interval 1000 to 4000 MS, the subject starts lifting his forearm to reach the angle \(\theta_{\text{ej}}=90^{\circ}\) which means his hand touches T-square; and that the forearm started lifting at \(\theta_{\text{ej}}=0^{\circ}\) to \(\theta_{\text{ej}}=90^{\circ}\). The third stage is the end stage from interval 4000 to 8000 MS, when the subject touches the T-square he will start lowering down his forearm to reach the table or to angle \(\theta_{\text{ej}}=0^{\circ}\); this means the forearm is down at \(\theta_{\text{ej}}=90^{\circ}\) to \(\theta_{\text{ej}}=0^{\circ}\).  
The experiment was run for three subjects with three loads: 3 kg, 5 kg and 7 kg. Figure 6 shows the raw SEMG signal for 3 kg during bicep dynamic contraction, as can be observed by the raw SEMG signal for 3 kg, when the bicep muscle starts concentric contraction and the SEMG amplitude starts increasing. Before the bicep muscle reaches the end eccentric contraction the SEMG amplitude starts increasing, in other words, the amplitude of the SEMG signal will be the maximum when the subject starts lifting their forearm and before lowering down their forearm (start and end the dynamic contraction).  
Figure 6: The result movement stages for SEMG signal for 3 kg.  
The amplitude of the SEMG signal between the start and end stage of the dynamic contraction will record the minimum amplitude. This confirms the bicep muscle is being relaxed (not fatigued). Otherwise, there is a relationship between amplitude SEMG signal and load, the amplitude increases during muscle contraction when the load is increased. The amplitude of the SEMG signal for the 3 kg load is shown in Figure 7 and is the smallest one with maximum amplitude for the two types of contraction; concentric contraction with maximum amplitude 446 and eccentric contraction with maximum amplitude 566.  
While the amplitude for the 5 kg load is higher than the 3 kg load with the maximum amplitude into two types of contraction as shown in Figure 8; concentric contraction with maximum amplitude 1023 and eccentric contraction with maximum amplitude 940. The range of amplitude for the SEMG signals is from 0-1023. The subject recoded the maximum amplitude in concentric contraction with 5 kg; this means the bicep muscle has consumed maximum effort in concentric contraction.  
Figure 8: Raw SEMG signal for 5 kg load.  
Figure 7: Raw SEMG signal for 3 kg.  
Finally, the amplitude for the 7 kg load is the highest with maximum amplitude for two types of contraction as shown in Figure 9; concentric contraction with maximum amplitude 1023 and eccentric contraction with maximum amplitude 1023. The subject recorded the maximum amplitude in concentric contraction and eccentric contraction with 7 kg; this means the bicep muscle has consumed maximum effort in concentric contraction and eccentric contraction.