# Applying Wearable Technology and a Deep Learning Model to Predict Occupational Physical Activities
## 2 Materials and Methods
### Occupational Physical Activities and Manual Material Handling Tasks
\begin{table}
\begin{tabular}{c c c c c c} \hline
**OPA Category** & & **Activity** & **Load** & **Duration/Repetition** & **Repetition** \\ \hline \multirow{4}{*}{1} & \multirow{4}{*}{Lifting/Lowering} & 1 & Lifting from floor to shoulder level & 4.5 kg (box) & 15 s & 2 \\  & & 2 & Lifting from floor to waist level & 4.5 kg (box) & 15 s & 2 \\  & & 3 & Lifting from shoulder to waist level & 4.5 kg (box) & 15 s & 2 \\  & & 4 & Lifting from shoulder to waist level & 4.5 kg (box) & 15 s & 2 \\  & & 5 & Stooped lifting from floor to waist level & 4.5 kg (box) & 15 s & 2 \\  & & 6 & Lifting from floor to 1.5 m level & 4.5 kg (box) & 15 s & 2 \\ \hline \multirow{2}{*}{2} & \multirow{2}{*}{One-handed lifting/lowering} & 7 & Right-handed lifting from floor to waist level & 4.5 kg (box) & 15 s & 2 \\  & & 8 & Left-handed lifting from floor to waist level & 4.5 kg (box) & 15 s & 2 \\ \hline \multirow{2}{*}{3} & \multirow{2}{*}{Pushing} & 9 & Pushing clockwise & 136 kg (cart) & 60 s & 1 \\  & & 10 & Pushing counterclockwise & 136 kg (cart) & 60 s & 1 \\ \hline \multirow{2}{*}{4} & Pulling & 11 & Pulling clockwise & 136 kg (cart) & 60 s & 1 \\ \hline \multirow{2}{*}{5} & One-handed pulling & 12 & Right-handed pulling & 136 kg (cart) & 60 s & 1 \\  & & 13 & Left-handed pulling & 136 kg (cart) & 60 s & 1 \\ \hline \multirow{2}{*}{6} & Standing & 14 & Standing & 0 kg & 60 s & 1 \\ \cline{1-1} \cline{3-5}  & & 15 & Sitting & 0 kg & 60 s & 1 \\ \hline \multirow{2}{*}{7} & \multirow{2}{*}{Kneeling} & 16 & Kneeling & 0 kg & 60 s & 1 \\  & & 17 & Static stooping & 0 kg & 60 s & 1 \\ \hline \multirow{2}{*}{10} & Walking & 18 & Walking & 0 kg & 60 s & 1 \\  & & 19 & Crouching & 0 kg & 60 s & 1 \\ \hline \multirow{2}{*}{12} & Crawling & 20 & Crawling & 0 kg & 60 s & 1 \\ \hline \multirow{2}{*}{13} & \multirow{2}{*}{Carrying} & 21 & Carrying & 4.5 kg (box) & 60 s & 1 \\  & & 22 &
\begin{tabular}{c} Reaching (standing) close to body \\ (shoulder elevation angle: 30\({}^{\circ}\)) \\ \end{tabular} & 0 kg & 60 s & 1 \\ \multirow{2}{*}{14} & \multirow{2}{*}{Reaching} & 23 & Reaching (standing) far from body \\  & & & (shoulder elevation angle: 60\({}^{\circ}\)) & 0 kg & 60 s & 1 \\  & & 24 & Reaching (standing) high and far from \\  & & & body (shoulder elevation angle: 135\({}^{\circ}\)) & 0 kg & 60 s & 1 \\ \hline \multirow{2}{*}{15} & \multirow{2}{*}{Overhead work} & 25 & Static overhead work & 0 kg & 60 s & 1 \\  & & 26 & Dynamic overhead work & 0 kg & 60 s & 1 \\ \hline \end{tabular}
\end{table} 
Table 1: Occupational physical activities (\(N\) of subjects = 15). Subjects performed carpet laying and bottle packing tasks until the task was complete; all tasks were completed within 5 min. Drilling was performed for 15 s. Details for each task include:  
* Bottle packing started with opening the box and putting 12 bottles into the box, which contained three rows (close, intermediate, and extended distances) and four bottles in each row. After placing the bottles in the box, the box was closed. The horizontal distances between the bottles and the body were <30 cm, 30-40 cm, and >40 cm. Next, the box was carried about two meters and placed on shelves of fixed heights ranging from floor height, waist height and shoulder height. * The carpet laying task was performed by lifting carpet from a shelf (floor, waist and shoulder height) onto a cart. The cart was then pushed or pulled to a distance of approximately two meters. After placing the carpet on the floor, subjects were asked to lay the carpet in a pre-defined rectangle. * The drilling task involved picking up a drill, or paint roller with one hand, walking to the designated area about two meters away and drilling overhead or on the ground. Afterwards the tool was returned to the original spot.