Metabolische und hormonelle Reaktionen bei Krafttraining mit und ohne Elektromyostimulation

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The dissertation includes three studies which resulted in six journal publications. One major purpose of previous investigations was to quantify the metabolic stimulus. Literature reveals that the understanding of the metabolic stimulus and its contribution to strength and power adaptations remain largely unknown. Although lactate is a current parameter in many studies estimating anaerobic metabolism during strength training, there is no data available regarding the kinetics of lactate during multiple sets of strength training. Further focus is put on electromyostimulation (EMS) as a method of strength training with specific metabolic requirements. In recent years, there is an augmented application of whole-body-EMS. However, there is still a lack of research data regarding metabolic/hormonal reactions to strength training with superimposed whole-body-EMS and the resulting adaptation effects on performance of strength exercises like loaded squats with superimposed EMS.
A main result of the dissertation was the difference in lactate kinetics during multiple sets of strength training with superimposed EMS compared to other high intensity interval exercise bouts (e.g. maximum power cycling). A specific decrease of blood lactate concentration occurred during the second and the third set of the strength training. This difference is primarily caused by continuous muscle tension which leads to an efflux reduction due to vascular occlusion. Furthermore, transportation to other tissues and elimination of lactate may explain the observed results. Eventually, specific metabolic stress experienced by the muscles has to be considered for signaling the impact of lactate.
Another study of the dissertation indicates that an application of whole-body-EMS during loaded squats (10 repetition maximum) has no significant effect on metabolic and hormonal reactions in comparison to the same training without EMS. In addition, there are no further adaptations of strength and power because of EMS. In consequence of the increased mechanical stimulus it is supposed that only a small amount of additional muscle activation occurs due to EMS. Sole exception was the hamstring-muscle group with significant EMS-specific improvements. In congruence with these findings previous research indicates that the muscular activation of the hamstrings is not influenced by additional loads during squats. Therefore these results demonstrate the potential of unloaded dynamic EMS on strength abilities. Furthermore, these specific adaptations might be beneficial with regard to the prevention of hamstring muscle injuries.
Translated title of the contributionMetabolic and hormonal reactions to strength training with and without superimposed electromyostimulation
Original languageGerman
Place of PublicationKöln
PublisherDeutsche Sporthochschule Köln
Number of pages55
Publication statusPublished - 2016

ID: 2786621

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