“…The content of diVerent training interventions included body mechanics, lifting technique, body posture, biomechanics, anatomy, pain management, ergonomic analysis, and job or work technique. Eight of these training programmes also included exercise training (Ryden et al 1988, Wollenberg 1989, Feldstein et al 1990, 1993, Guo et al 1992, Daltroy et al 1993, Lagerstrom et al 1998), but always as part of a larger training eVort. Seven of the studies used a randomized design (Carlton 1987, Dortch and Trombly 1990, McCauley 1990, Guo et al 1992, Daltroy et al 1993, Scopa 1993.…”