Table 3 Plantar pressure parameters for each foot region during baseline play on Greenset and clay.
| Parameters | Surface | Foot zones | Significant main effects and/or interactions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Medial heel | Lateral heel | Medial midfoot | Lateral midfoot | Medial forefoot | Central forefoot | Lateral forefoot | Hallux | Lesser toes | |||
| Maximum force (N) | Greenset: | 218 (42) | 117 (34) | 164 (47) | 130 (44) | 253 (73) | 198 (54) | 119 (26) | 195 (54) | 206 (50) | |
| Clay: | 237 (143) | 137 (116) | 177 (82) | 168 (119) | 285 (108) | 207 (93) | 153 (111) | 205 (80) | 211 9103) | F | |
| Mean force (N) | Greenset: | 57 (23) | 29 (12) | 61 (21) | 50 (18) | 135 (50) | 101 (23) | 59 (15) | 108 (38) | 116 (25) | |
| Clay: | 49 (14) | 26 (13) | 63 (29) | 58 (33) | 117 (41)* | 80 (18)** | 53 (22) | 84 (37)** | 84 (31)*** | F, S, I | |
| Peak pressure (kPa) | Greenset: | 164 (29) | 131 (25) | 167 (48) | 119 (18) | 326 (91) | 251 (71) | 157 (36) | 299 (79) | 226 (54) | |
| Clay: | 176 (97) | 142 (89) | 167 (52) | 146 (91) | 377 (158) | 283 (159) | 202 (155) | 353 (158) | 271 (164) | F, I | |
| Mean pressure (kPa) | Greenset: | 100 (17) | 74 (9) | 72 (12) | 59 (10) | 195 (53) | 136 (31) | 89 (15) | 176 (47) | 108 (21) | |
| Clay: | 112 (64) | 86 (53) | 78 (27) | 70 (33) | 222 (88) | 143 (62) | 109 (67) | 190 (66) | 118 (45) | F | |
| Mean area (cm2) | Greenset: | 8 (3) | 5 (2) | 13 (6) | 12 (3) | 11 (2) | 11 (2) | 9 (1) | 9 (2) | 15 (2) | |
| Clay: | 8 (3) | 6 (3) | 14 (6) | 13 (5) | 10 (2) | 11 (3) | 9 (2) | 8 (2) | 12 (3)** | F, I | |
| Contact time (ms) | Greenset: | 214 (97) | 203 (62) | 256 (70) | 249 (71) | 266 (63) | 266 (59) | 258 (64) | 266 (62) | 266 (61) | |
| Clay: | 293 (107) | 280 (78) | 327 (86) | 322 (85) | 345 (73) | 338 (72) | 319 (83) | 344 (73) | 342 (73) | F, S | |
Values are mean (SD).
F and S indicate significant main effects of foot region and surface; I indicates a significant interaction between foot region and surface.
*p<0.05; **p<0.01; ***p<0.001 denote significant difference between Greenset and clay.