The Role of Knee Positioning and Range-of-Motion on the Closed-Stance Forehand Tennis Swing

Table 3. Work of knee joints and correlations with knee positions and ROM.

Knee Joint Work	Mean (Nm)	SD (±) (Nm)	Rear Knee IP: Setting (R²)	Rear Knee ROM: Setting (R²)	Front Knee IP: Swing (R²)	Rear Knee IP: Swing (R²)	Front Knee ROM: Swing (R²)	Rear Knee ROM: Swing (R²)
Rear:Setting	-32.1	13.9	.327	.581	N/A	N/A	N/A	N/A
Front:Setting	0	0	N/A	N/A	N/A	N/A	N/A	N/A
Rear:Swing	10.0	5.6	N/A	N/A	---	.217*	---	.411
Front:Swing	36.4	10.9	N/A	N/A	.240	---	.623	---

Note: All variables are significant at p<0.05 unless indicated by *