Acta Gymnica, 2015 (vol. 45), issue 2

Hip abductors and thigh muscles strength ratios and their relation to electromyography amplitude during split squat and walking lunge exercises

Petr Stastny, James J. Tufano, Michal Lehnert, Artur Golas, Amr Zaatar, Zuzana Xaverova, Adam Maszczyk

Acta Gymnica 2015, 45(2):51-59 | 10.5507/ag.2015.011

Background: The hip abductors (HAB), quadriceps (Q) and hamstrings (H) reciprocal strength ratios are predictors of electromyography (EMG) amplitude during load carrying walking at moderate intensity. Therefore, these strength ratios might predict also the EMG during the exercises as walking lunge (WL) or split squat (SSq) at submaximal intensity. Objective: To determine whether the EMG amplitude of vastus mediali (VM), vastus laterali (VL), biceps femoris (BF) and gluteus medius (Gmed) is associated with muscle strength ratio during SSqs and WLs. To determine whether the EMG amplitude differs between individuals with HAB/H ratio above and below one...

Motor competence in Czech children aged 11-15: What is the incidence of a risk of developmental coordination disorder?

Jakub Kokštejn, Rudolf Psotta, Martin Musálek

Acta Gymnica 2015, 45(2):61-68 | 10.5507/ag.2015.009

Background: Current findings suggest that the prevalence of developmental coordination disorder (DCD) ranges widely between countries. A major reason for this wide range of prevalence is how cases of DCD are identified. Gender differences in level of motor competence in children with movement difficulties may play a key role in the choice of type of intervention. Objective: The aim of the study was to reveal the prevalence of significant movement difficulties with high probability of presence of DCD in Czech children aged 11 to 15. At the same time we wanted to assess possible gender differences in different types of the movement difficulties. Methods:...

The impact of obesity on foot morphology in women aged 48 years or older

Kristína Tománková, Miroslava Přidalová, Aleš Gába

Acta Gymnica 2015, 45(2):69-75 | 10.5507/ag.2015.010

Background: Obesity is major risk factor for many diseases within society and represents extensive loads for the feet which lead to various foot disorders and deformities. Objective: The aim of this study was to evaluate the impact of obesity as represented by percent body fat (PBF) on foot morphology. Methods: The study sample included 139 Czech women aged 48-69 years. The women were divided into two groups by PBF: non-obese women (NOW) (n = 66; PBF < 35%) and obese women (OW) (n = 73; PBF > 35%). Measurements included % PBF and width, length and angle dimensions of foot. The Chippaux-Smirak...

The influence of a ten week Tai Chi program with seniors

Donald N. Roberson Jr., Shu-Yi Wang, Erik Sigmund, Hana Valkova

Acta Gymnica 2015, 45(2):77-84 | 10.5507/ag.2015.014

Background: Physical activity can help to restore physical functioning loss due to disuse and chronic illness as well as aging. Objective: There were two main aims in this study. (1) To assess the impact of a brief 10-week Tai Chi program on health-related quality of life, functional mobility, and balance performance; (2) To examine the feasibility of a ten week Tai Chi exercise program in a retirement center. Methods: Fifteen healthy voluntary elder residents (aged 76.8 ± 9.3 years) took place in this study. The participants were tested with the Timed Up-and-Go, One-Leg Stance, Functional Reach as well as self-reported Health Related...

Trajectory length of pitch vs. roll: Technique for assessment of postural stability

Patrik Kutílek, Vladimír Socha, Ondřej Čakrt, Jakub Schlenker, Lucia Bizovská

Acta Gymnica 2015, 45(2):85-92 | 10.5507/ag.2015.008

Background: Patients with disorders of nervous or musculoskeletal system often show instability of the body segments during the stance tasks. Traditionally, stabilometric platforms are used to measure body sway. However, these devices are expensive and do not allow the evaluation of the individual movements of body segments. At present, accelerometers or gyroscopes are used to measure the movements of the body segments. For these new motion capture (MoCap) systems, methods for quantitative evaluation of a body segment movement are being developed. Objective: The main objective of this paper is to describe a new method which would be suitable for quantifying...

Toss differences between the slice serve and the kick serve in tennis

Jan Carboch, Vladimír Süss

Acta Gymnica 2015, 45(2):93-97 | 10.5507/ag.2015.012

Background: Pre-contact information of servers' motion is important for receiving players in tennis. Objective: The aim of this study is to examine whether serving players use the same ball toss for kick serve (KS) and slice serve (SS) at two different directions of serves, from the receiver's view. Methods: 10 male right-handed professional tennis players with an average ATP ranking of 533 were videotaped from the receiver's view using a high-speed video camera (200 Hz). Firstly, they served SS and then KS from deuce court. After reaching 3 successful SS and 3 KS to the correct location, the same procedure followed from the ad court. Kinematic...