Supplementary data for: Evaluation of a new pruning and tending system for young stands of Douglas fir

Comparison of a conventional tending and pruning system (using handsaw and chainsaw) with a state state-of of-the the-art system (using electric pruning shears and the backpack brushcutter pole-clearing saw Husqvarna 535FBX ‘Spacer’); comprehensive field trial consisting of a time time and and motion study and ergonomic assessment through heart heart-rate measurements and posture analysis.