Fig. 7.

Comparison of changes in muscle activation patterns between racquets. The radar plot shows the median IEMG ratio of each recorded muscle or muscle group. An IEMG ratio value of 100% indicates no change in muscle activation with respect to baseline values (see dashed red line pentagon). Players showed signs of fatigue using both racquets with IEMG values dropping below 1 especially for the wrist muscles. Proximal deltoid muscle showed no signs of fatigue for both racquets. Note the larger area of the VDT pentagon indicating that fatigue levels were lower for the wrist flexors, triceps and biceps muscle. *p ​< ​0.05.