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Table 4 Mean curve parameters of M. gluteus maximus (GlutMax), M. gluteus medius (GlutMed), lateral hamstrings (HamLat), medial hamstrings (HamMed), lumbar part of M. erector spinae (ErecLum), thoracic part of M. erector spinae (ErecThor), M. rectus abdominis (Abdo) and M. obliquus abdominis (Obli) for the eccentric and concentric phase of BE

From: Loading conditions in the spine, hip and knee during different executions of back extension exercises

    GlutMax [% MVC] GlutMed [% MVC] HamLat [% MVC] HamMed [% MVC] ErecLum [% MVC] ErecThor [% MVC] Abdo [% MVC] Obli [% MVC]
Eccentric BEh 1L 17.4 ± 9.9 10.1 ± 5.2 11.9 ± 5.3 12.8 ± 9.7 13.6 ± 4.7 9.3 ± 5.5 2.5 ± 4 3.7 ± 4.4
2L 12.7 ± 7.0 7.2 ± 4.3 10.5 ± 5.4 9.6 ± 7.5 12.3 ± 4.6 9.8 ± 7.0 2 ± 2.2 3.8 ± 4.2
BEs 1L 17.9 ± 11.0 11.6 ± 6.0 13.8 ± 6.2 14.1 ± 11.2 13.7 ± 6.0 5.6 ± 4.8 3.2 ± 3.4 5.2 ± 5.5
2L 13.5 ± 7.6 8.2 ± 4.1 14.4 ± 6.5 12.2 ± 8.8 11.8 ± 6.2 4.5 ± 2.4 3.4 ± 3.3 5.1 ± 5.7
Concentric BEh 1L 22.7 ± 12.7 13.5 ± 6.9 16.1 ± 7.1 16.4 ± 11.6 22.8 ± 8.2 9.7 ± 6.0 2.7 ± 3.9 4.6 ± 5.3
2L 16.5 ± 8.5 9.3 ± 6.0 16 ± 7.0 13.3 ± 10.0 18.9 ± 7.6 9.7 ± 7.7 2.1 ± 2.3 4.3 ± 4.6
BEs 1L 20 ± 12.1 13 ± 7.8 13.8 ± 6.8 13.6 ± 9.7 21.1 ± 9.4 7.6 ± 6.1 2.8 ± 3.3 5.1 ± 4.8
2L 15 ± 8.6 8.9 ± 5.6 14.4 ± 6.5 12 ± 8.3 17.6 ± 7.8 6.4 ± 4.6 2.9 ± 3.3 4.7 ± 4.9