ABSTRACT
Objective To obtain kinetic parameters of the plantar pressure in different age groups during normal walking, so as to provide theoretical references for designing insoles and sports shoes for different age groups, and maximally minimize the risk of foot injuries. Methods Footscan force plate was used to test the peak plantar force and pressure of 120 subjects in 4 different age groups (15 male and 15 female in 20-30, 30-40, 40-50, 50-60 age group, respectively). Results The peak plantar force constantly changed with age, showing a rising tendency, except that at the first phalanx area, the peak plantar force gradually decreased with age. For female subjects, the peak plantar pressure in the first phalanx area was gradually decreasing. Most subjects had significantly higher force on the 2nd and 4th bones than the 1st and 5th metatarsals. The 2nd metatarsal peak plantar force in male 50-60 age group was also significantly higher than that in male 20-50 age group (P<0.05). Only the peak plantar force of the 1st phalanx gradually decreased with age increasing, and the rest of the plantar region showed an increasing tendency. A significant change in the peak plantar pressure was observed, especially in the 2nd and 3rd metatarsals, which showed a rising tendency (P<0.05). Conclusions The plantar force and pressure on each part of human foot constantly changed with age. To find out the characteristics of plantar pressures in different age groups can help to design corresponding sports shoes and exert the functions of sports shoes in a better way.
ABSTRACT
Objective To document and analyze thepeak force and work during isokinetic pedaling at different linear speeds and the flexion-extension peak force ratio.Methods Thirty healthy adults were tested using the Legpress system of the IsoMED 2000 apparatus.Peak force,work and the flexion-extension peak force ratio were recorded and analyzed during isokinetic pedalingat 5 and 50 cm/s.Results The peak force applied and work done by the lower limbs were both significantly lowerwhen pedaling at 50 cm/s than at 5 cm/s.There was no significant difference in peak force or work between the left and right legs at 50 cm/s.The peak force ratio at 50 cm/s was significantly higher than at 5 cm/s.Conclusion The mechanical characteristics of the leg muscles during isokinetic pedaling vary greatly.It is advisable to choose different linear speeds or training modes accordingly.