A significant main effect for time was observed ( P < 0.05 ) , whereby the intervention group increased isometric neck strength in all planes after the 5-week intervention ( F preintervention = 334.45 39.31 N vs F postintervention 396.05 75.55 N ; E preintervention = 606.19 97.34 vs E postintervention = 733.88 127.16 N ; LSF preintervention = 555.56 88.34 N vs LSF postintervention = 657.14 122.99 N ; RSF preintervention = 570.00 106.53 N vs RSF postintervention = 668.00 142.18 N ) .