Ausgabe 1-2014 Archives

Reliability and Validity of Two Measurement Systems in the Quantification of Jump Performance

Post author:Artd
Post published:06.01.2014
Post category:monitoring sports science wearables

There are different devices on the market for assessing strength and power in vertical jumping as a fundamental requisite of an athlete’s performance. The purpose of this study was to assess the reliability and validity of two instruments measuring force, power, velocity, and jump height in squat jumps. Myotest® (MYO) (Myotest SA, Switzerland) was compared with force plate measurements (Quattro Jump® [QUATTRO], Kistler, Switzerland & SPSport Software, Trins, Austria). Forty-three frontier-guards (age range 25–58 years) performed twice a series of five squat jumps (SJ) simultaneously using MYO device along with QUATTRO force plate. Reliability was analysed using ICC, CV and RMSE. Results for reliability for both devices show good results with ICCs ranging from 0.910 to 0.955, and CVs ranging from 2.33% to 6.59% for discrete outcome variables.

E-Sports – Comparison of training intensity in two commercial gaming consoles with classical ergometer training

Post author:Artd
Post published:05.01.2014
Post category:exercise is medicine load sports and society sports and technology sports science

There is a substantial lack of research comparing the effects of game console-based activities against conventional activities (aerobic, bicycle ergometer) within therapeutic and rehabilitative settings and the results are inconsistent. The aim of the study was to investigate if training with exergames (Nintendo Wii vs. Xbox 360) compared with conventional activities (bicycle ergometer) would have different effects on physiological and psychological parameters. Method: A quantitative three-armed, randomised, not-blinded study design was used. The test persons were randomly assigned to one of three activities: 1) Bicycle ergometer (n = 6); 2. Nintendo Wii game (n = 16); 3. Xbox 360 game (n = 17).

Correlation between RPE and blood lactate concentration in resistance training

Post author:Artd
Post published:04.01.2014
Post category:sports science training training

Quantifying actual individual training intensity in resistance training is essential for athletes and trainers, but is at present only possible with methodological problems. Thus, the purpose of this article is to examine the relationship of different types of RPE (rating of perceived exertion) with blood lactate concentrations in hypertrophy training. Hereby it is possible, to deduce conclusions about the validity of the RPE-scale and different times of monitoring. In this article two studies with male subjects are presented (study 1: n=10, 23.7 ± 2.8 years; study 2: n=16, 24.9 ± 2.0 years). In both surveys, subjects had to complete 3 sets with 3 minutes of rest between sets in every exercise. Blood lactate was measured before each exercise and two minutes after the completion of each set.

Read more about the article The correlation between dynamic and isometric maximal strength parameters and muscle cross sectional area/volume

The correlation between dynamic and isometric maximal strength parameters and muscle cross sectional area/volume

Post author:Artd
Post published:03.01.2014
Post category:exercise physiology sports science

The aim of the study was the evaluation of the correlation between maximal strength and muscle mass depending on the kind of analysis which was used. Two different methods of strength evaluation and several morphological parameters were used. 77 male participants (age: 27,2 ± 6,6 years; body height: 179,9 ± 4,0 cm; body weight: 82,5 ± 10,4 kg) joined the study. Maximal strength was tested by measuring the isometric force (MIF) and analysing the one repetition maximum (1RM). The morphological data was captured by magnetic resonance imaging. The volume of the muscle (VOL), the biggest cross sectional area (QSMAX), the cross sectional area of the upper (QS30), middle (QS60) and lower (QS90) third of the scanned area of the arm flexors were examined.

Position paper for a a strength training programmation based on demands

Post author:Artd
Post published:02.01.2014
Post category:coaching growth load performance sports science training training

Strength training guidelines tend to be based on stress factors such as relative weight, repetitions, sets, rest inbetween sets, muscle action velocity and number of sessions per week. Based on the stress-strain-concept, empirical results and training experience require additional parameters related to the molecular and cellular adaptations for an effective strength training concept. In contrast to what has generally been assumed, it is notable that the individual percentage of 1-Repetition-Maximum (1 RM) is not the intensity but only a relative training load and therefore a stress factor. Intensity is referred to here as a strain factor, operationalized as the level of effort applied to a given load.

Analysis of different variants of squats based on the literature – a focus on overuse injuries an adaptations

Post author:Artd
Post published:01.01.2014
Post category:load performance sports injury sports science training

In the science and practice of strength training it is sometimes suggested that the deep squat entails an increased injury risk of the lumbar spine and the knee joint. Avoiding deep flexion is believed to minimize the magnitude of knee joint forces. Because within the first 50° of knee flexion calculated retropatellar compressive stress is lower, execution of quarter or half squats is recommended when overuse injuries and degenerative changes of the patella-tendon-complex exist.

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