## 3 Results
One paper [18] reported adverse results in the hypoxia group due to training (see Figure 4a). The documents presented between 5 and 10% percentage change in the muscle hypertrophy variable. For example, studies by [PERSON] et al. and [PERSON] et al. [22; 23; 25] based their training schedule on 4-7 weeks. These papers included loads of 3-4 sets with 10-15 repetitions [22; 23; 25]; and applied a percentage of effort between 50 to 70% of 1 RM [22; 23]. Of the comprehensive studies on the strength variable, six presented a percentage of change between 5 and 25% between groups [15; 16; 22; 25; 29; 30], three presented a rate of change between 2 and 4.9% [16; 20; 28], and seven studies less than 2% [6; 17; 19; 21; 24; 25; 31], two documents reported a higher percentage of change in the strength variable in the control group (Figure 4b) [21; 25]. Finally, the studies that reported between a 5 and 25% percentage change in muscle strength [15; 18; 22; 23; 30; 32] based their intervention on a four to 8-week training programme [15; 18; 22; 23; 30] and used training loads of three to four sets with six to 15 repetitions and a percentage effort of 50-70% of 1 RM. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Reference**} & \multirow{2}{*}{**FIO2**} & \multirow{2}{*}{ \begin{tabular}{c} **Number of** \\ **Participants** \\ \end{tabular}  } & \multirow{2}{*}{\ \begin{tabular}{c} **Physical** \\ **State** \\ \end{tabular}  } & \multirow{2}{*}{ \begin{tabular}{c} **Age** \\ **(years)** \\ \end{tabular}  } & \multirow{2}{*}{**Weight**} & \multirow{2}{*}{**Modality**} & \multirow{2}{*}{**W**} & \multirow{2}{*}{**Ses**} & \multirow{2}{*}{**Ses/W**} & \multirow{2}{*}{**Repetitions**} & \multirow{2}{*}{**Series**} & \multirow{2}{*}{**Strength**} \\ \hline
[17] & HYP:12 & 19 (\(\sigma\)) & Sedentary & \(24.3\pm 2.5\) & \(72.9\pm 9.0\) & Knee Est + & 4 & 12 & 3 & 25 & 6 & 30\% RM \\
[23] & HYP:16 & 14 (\(\sigma\)) & Sedentary & \(21.4\pm 1.1\) & \(65.9\pm 8.1\) & Press + & 6 & 12 & 2 & 10 & 4 & 70\% RM \\  & NOE:21 & & & elbow flex & & & & & & & \\
[27] & SpCo21 & & & & Knee Est + & 5 & 15 & 3 & Muscle & 6 & 20\% RM \\
[28] & 30 (\(\sigma\)) & Neball players & \(20.2\pm 3.3\) & \(65.2\pm 6.5\) & Knee flex & 5 & 15 & 3 & \begin{tabular}{c} **10** \\ **failure** \\ \end{tabular}  & 6 & 20\% RM \\
[18] & HYP:15 & & Sedentary & \(21.3\pm 2.0\) & \(67.3\pm 9.7\) & Spatat & 6 & 18 & 3 & 10 & 3 & 50\% RM \\
[6] & HYP:14.4 & 16 (\(\sigma\)) & \ \begin{tabular}{c} Recreational \\ training \\ \end{tabular}  & \(28.4\pm 1.6\) & \(68.2\pm 2.2\) & \begin{tabular}{c} **Bench press** \\ \end{tabular}  & 8 & 16 & 2 & 10 & 5 & 70\% RM \\
[19] & HYP:12.7 & & & & & & & & & \\ NORE:20.9 & 13 (\(\sigma\)) & Healthy & \(23.0\pm 1.0\) & \(60.2\pm 1.6\) & Elbow ext & 8 & 24 & 3 & \begin{tabular}{c} Muscle \\ failure \\ \end{tabular}  & 3 & 10 RM \\
[29] & HYP:12.9 & 12 (\(\sigma\)) & Trained & \(21.0\pm 2.4\) & \(80.6\pm 12.3\) & Bench press & 6 & 12 & 2 & 10 & 8 & 70\% RM \\
[30] & HYP:14.5 & & & & & & & & & \\ NORE:20 & 20 (\(\sigma\)) & Trained & & & & & & & & \\ NORE:20 & & & & & & & & & & \\ HYP:16 & & & & & & & & & & \\ HYP:12.6 & & & & & & & & & & \\ HYP: & & & & & & & & & & \\ HYP: & & & & & & & & & & \\
[16] & 12.3–16.4 & & & & & & & & & & \\ HYP:14 & & & & & & & & & & \\ NORE:20 & & & & & & & & & & \\ HYP:17.2 & & & & & & & & & & \\ NORE:20.9 & & & & & & & & & & & \\ NORE:20.9 & & & & & & & & & & \\ HYP:17.2 & & & & & & & & & & \\ NORE:20.9 & & & & & & &