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We study vertical jumping in a simple robot comprising an actuated mass-spring arrangement. The actuator frequency and phase are systematically varied to find optimal performance. Optimal jumps occur above and below (but not at) the robot's resonant frequency f(0). Two distinct jumping modes emerge: a simple jump, which is optimal above ff(0), is achievable with a squat maneuver, and a peculiar...

A ship moving steadily forward in shallow water of constant depth h is usually subject to downward forces and hence squat, which is a potentially dangerous sinkage or increase in draft. Sinkage increases with ship speed, until it reaches a maximum at just below the critical speed p gh. Here we use both a linear transcritical shallow-water equation and a fully dispersive Ž nite-depth theory to d...

outpatient department of Osmania General Hospital, Hyderabad, India, in January 2014 with a complaint of pain, bilateral swellings of the knee and ankle joints and difficulty squatting and sitting cross-legged (Fig. 1a, b, c). On examination, there was synovial thickening of knee joints. There was no clinical evidence of pericarditis. Echocardiogram was normal. Laboratory results for inflammato...

Patellofemoral pain syndrome (PFPS) [2] PFPS is a diagnosis of exclusion and is defined as pain behind or around the patella. It is synonymous with the term retro-patellar pain and has in the past been referred to as chondromalacia patellae. It is caused by compressive forces in the patellofemoral joint (PFJ). PFPS is very common. Symptoms are usually provoked by climbing or descending stairs, ...

A study was performed to evaluate effects of elastic energy stored pre-stretch on the mechanical work output while performing vertical jump. Eight male volunteers of age between 21 29 years old participated in the present study. The present study hypothesized that the vertical jump height during countermovement jumps (CMJ) would be higher than that during squat jump (SJ). During squat jump, a v...

The aim of this paper was to investigate the anthropometric and strength characteristics of elite male volleyball athletes and determines if differences exist in these characteristics between starters (S) and non-starters players (NS). A group of 22 professional male team volleyball players participated in the study and the players were categorized as S (n= 13) and NS (n= 9). Anthropometric cha...

A major interest in athletics is increasing overall power output. A widely accepted way to determine overall athletic ability and power is the vertical jump test [1]. Much research has been conducted on overall jump power in order to determine possible strategies for training [1, 2], but little research has been conducted on the contributions made by the three leg joints (hip, knee, and ankle) ...

The purpose of this article is to present a multifaceted understanding of the processes underlying psychological modeling and their relationships to learning the free weight squat exercise. In order to benefit from the favorable training adaptations afforded by the barbell squat, performing the exercise with proper technique is absolutely crucial. Proper visual demonstration or modeling is vita...

1 School of Health Sciences, Robert Gordon University, Aberdeen, United Kingdom 2 School of Social and Health Sciences, University of Abertay, Dundee, United Kingdom 3 Sport Performance Research Institute New Zealand, School of Sport and Recreation, Auckland University of Technology, Auckland, New Zealand. 4 Faculty of Health Sciences and Medicine, Bond University, Gold Coast, Australia 5 Centr...