2.1. Study Design and Participants. The study design, recruitment
of participants, randomization of 48 women, and main
results have been described in detail previously [14, 28]. In the
present case-control study, 42 women with trapezius myalgia
(MYA, mean ± SD: 44 ±8 yrs, 165 ±6 cm, 72 ±15 kg, and days
with neck pain during previous year 219 ± 19 days) and 20
women comparable with regard to job-type, age, weight, and
height but without neck muscle complications (CON, mean
± SD: 45 ± 9 yrs, 167 ± 6 cm, 70 ± 11 kg, and days with neck
pain during previous year 5±6 days) participated. Exclusion