The validity of using one force platform to quantify whole-body forces, velocities, and power during a plyometric push-up

Abstract

Background Previous studies have typically measured velocity and power parameters during the push-up, either using one or two force platforms. The purpose of the study was to compare the force, velocity, and power parameters between the one-force-platform method and the two-force-platform method during plyometric push-ups. Methods Thirty-four physically active young adults participated in the study to perform the plyometric push-up. For the two-force-platform calculation method, the forces applied to the feet and hands were both measured. For the one-force-platform calculation method, the forces applied to the feet were assumed to be constant, while the forces applied to hands were measured by one force platform. Whole-body linear velocities were calculated based on the impulse and momentum theorem. Whole-body power was calculated as the product of the whole-body forces and velocities. Results The one-force-platform method overestimated the whole-body velocities and power compared with the two-force-platform method (1.39 ± 0.37 m/s vs. 0.90 ± 0.23 m/s, Cohen’s d = 1.59, p < 0.05; 1.63 ± 0.47 W/body weight vs. 1.03 ± 0.29 W/body weight, Cohen’s d = 1.49, p < 0.05). These differences were caused by the decreased forces applied to the feet compared to the initial value throughout most of the push-up phase. Large to perfect correlations (r = 0.55 – 0.99) were found for most variables between the two-force-platform and one-force-platform methods. Previous findings of push-up velocities and power using the two-force-platform and one-force-platform methods should be compared with caution. While the two-force-platform method is recommended, linear regression equations may be used to predict velocities and power parameters obtained from one force platform. Conclusions For those professionals who need to accurately quantify kinetic variables during the plyometric push-up, the two-force-platform method should be considered.

Performance and bilateral asymmetries of upper and lower extremity dynamic strength and balance in young soccer players

“…Both Intrinsic and extrinsic factors could explain the differences in performance between males and females. Intrinsic factors include but are not limited to skeletal activation, neuromuscular control levels, motor control strategy, and tness level [6, 13,21]. External factors such as maturation and tness level are also relative to performance differences in sex [20].…”

“…Reliable assessments of quanti cation bilateral asymmetry have been established [6,16,17,18]. The use of push-up and vertical jump testing in elite sports has increased because it provides easily accessible, low-cost, and valuable interlimb asymmetry data [19,20,21,22]. Such information is often considered when aiming to reduce the possibility of injury or reinjury during rehabilitation with athletes [23].…”

Pilot Study: Effect of Morton’s Extension on the Subtalar Joint Forces in Subjects with Excessive Foot Pronation

“…New technology tools have been used to capture plantar pressures and the force exerted on the foot during different activities. The force plate is a measurement instrument used to analyze plantar force; it measures the reaction force of the ground that is exerted during the dynamics of stepping in three planes of space (Fx, Fy, Fz) [6].…”