This study investigates if/how an experimentally applied neck muscle pain influences head repositioning error in healthy participants.

Healthy volunteers will participate in a single session study with a crossover design.

During the study healthy participants will be randomized to either receive a injection of hypertonic saline (painful injection) or isotonic saline (control injection) in a neck muscle.

Head repositioning accuracy will be assessed with and without performing a cognitive task.

Inclusion Criteria:

• Healthy men and women aged 18-50 years
• Right handed
• Able to speak, read and understand Danish or English
• Normal pain free neck and shoulder range of motion

Exclusion Criteria:

• Pain from the neck or shoulder area
• Prior surgery in neck or shoulder
• Pregnancy
• Drug addiction defined as the use of cannabis, opioids or other drugs
• Self reported neurologic, musculoskeletal or mental illnesses