790 Freizeitgestaltung, darstellende Künste, Sport
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Highlights
• Investigation of how the peripheral muscle system responds to imagination in interaction with proprioceptive information.
• Motor imagery altered time to contraction but not velocity and maximal displacement of the muscle belly.
• Findings indicate that MI might impact on the initiation of contraction.
Abstract
Many studies have investigated the activation of cortical areas and corticospinal excitability during motor imagery (MI) in relation to motor execution. Similar activation of cortical areas during imagined and executed bodily movements and increased corticospinal excitability while imagining movements has been demonstrated. Despite these similarities on the central nervous system level, there is no overt movement during MI. This suggests that centrally generated signals must be inhibited at some level. Second, even in the absence of movement, some studies find behavioral effects of MI interventions. Most of the studies have investigated the role of MI on the cortical or spinal level, but less is known about the peripheral level, such as the muscle system. Testing muscular excitability during MI will give further hints whether and how low-threshold motor commands during MI reach the muscular system. Furthermore, the extent of the shown effects during imagery depends considerably on type of imagery, available proprioceptive information, and imagery ability. Therefore, this study investigates muscular excitability of the biceps brachii muscle manipulating imagery mode (MI vs. visual imagery) and proprioceptive information (with or without muscle effort). 40 participants were included in the analysis. The mechanical response of the muscle after a single electrical stimulus was assessed via tensiomyography. The corresponding variables maximal displacement, delay time, and contraction velocity were used to calculate 2 × 2 ANOVAs with repeated measurements. The absence of interaction effects shows that possible imagery effects on the muscle system are not increased by effort. MI altered time to contraction with lower delay time compared to control condition. Velocity and maximal displacement of the muscle belly during contraction did not differ between imagery conditions. This indicates that MI might impact on the initiation of muscle contraction but does not change the contraction itself. Thus, neuronal factors are moving further into focus in the context of MI research.
This study investigated the effects of a daily plyometric hopping intervention on running economy (RE) in amateur runners. In a randomized, controlled trial, thirty-four amateur runners (29 ± 7 years, 27 males) were allocated to a control or a hopping exercise group. During the six-week study, the exercise group performed 5 min of double-legged hopping exercise daily. To progressively increase loading, the number of hopping bouts (10 s each) was steadily increased while break duration between sets was decreased. Pre- and post-intervention, RE, peak oxygen uptake (VO2peak), and respiratory exchange ratio (RER) were measured during 4-min stages at three running speeds (10, 12, and 14 km/h). ANCOVAs with baseline values and potential cofounders as cofactors were performed to identify differences between groups. ANCOVA revealed an effect of hopping on RE at 12 km/h (df = 1; F = 4.35; p < 0.05; η2 = 0.072) and 14 km/h (df = 1; F = 6.72; p < 0.05; η2 = 0.098), but not at 10 km/h (p > 0.05). Exercise did not affect VO2peak (p > 0.05), but increased RER at 12 km/h (df = 1; F = 4.26; p < 0.05; η2 = 0.059) and 14 km/h (df = 1; F = 36.73; p < 0.001; η2 = 0.520). No difference in RER was observed at 10 km/h (p > 0.05). Daily hopping exercise is effective in improving RE at high running speeds in amateurs and thus can be considered a feasible complementary training program.
Clinical trial registration German Register of Clinical Trials (DRKS00017373).
Germany experienced a 6-month second lockdown (November 2020–April 2021) during the COVID-19 pandemic, which included the closure of all physical activity (PA) facilities. The use of online exercise classes (OECs) was promoted by public health and exercise organizations. Using the present cross-sectional online survey, we assess the use of and opinion towards OECs in Germany during the second lockdown. We used contingency tables and the Chi2 test to calculate the frequency of awareness and use of OECs according to PA status, well-being and demographic data, and conducted a binary logistic regression with OEC awareness or use and dichotomized independent predictors. The associations between opinion and activity status, frequency of use, educational attainment, age and body mass index were calculated using Spearman correlations. A total of 993 datasets were analyzed in detail. Of the 785 (79.1%) participants reporting awareness of OECs, 536 tried them, and 262, 188 and 85 used them <1 per week, 1–2 per week and ≥3 per week, respectively. The users were typically active, female participants with poorer mental well-being. The opinions towards OECs varied according to participant characteristics, such as activity status, BMI and age. Overall, regular OEC use was quite limited, and, as such, cannot replace in-person exercise opportunities. Keeping physical activity facilities open and safe must be prioritized in the ongoing pandemic.
Neben einer guten Tanztechnik spielt die Körperform von professionellen Tänzer*innen eine entscheidende Rolle. Im klassischen Tanz gilt eine leptosom-grazile Form mit langen Gliedmaßen bei Frauen als ideal. Dementsprechend ist die Prävalenz von Untergewicht hoch. Dabei ist es nicht ausgeschlossen, dass dieses physische Erscheinungsbild mittels Diäten erreicht wird. Auffällig ist eine höhere Prävalenz von Störungen des Essverhaltens und Essstörungen vor allem bei Tänzerinnen im Vergleich zu nicht tanzenden Vergleichsgruppen. Im Zusammenhang mit dem Untergewicht können hormonelle Störungen, wie Amenorrhoe, Osteoporose oder Leistungseinschränkungen auftreten. Daher ist es wichtig, Tänzer*innen regelmäßig zu untersuchen und präventive Maßnahmen zu ergreifen. Ziel der vorliegenden Übersicht ist die Darstellung der Literatur zu diesem Thema.
Tensiomyography measures the radial displacement of a muscle during an electrically evoked twitch contraction. The rate of muscle displacement is increasingly reported to assess contractile properties. Several formulas currently exist to calculate the rate of displacement during the contraction phase of the maximal twitch response. However, information on the reproducibility of these formulas is scarce. Further, different rest intervals ranging from 10 s to 30 s are applied between consecutive stimuli during progressive electrical stimulation until the maximum twitch response. The effect of different rest intervals on the rate of displacement has not been investigated so far. The first aim of this study is to investigate the within and between-day reliability of the most frequently used formulas to calculate the rate of displacement. The second aim is to investigate the effect of changing the inter-stimulus interval on the rate of displacement. We will determine the rectus femoris and biceps femoris rate of displacement of twenty-four healthy subjects’ dominant leg on two consecutive days. The maximum displacement curve will be determined two times within three minutes on the first day and a third time 24 h later. On day two, we will also apply three blocks of ten consecutive stimuli at a constant intensity of 50 mA. Inter-stimuli intervals will be 10 s, 20 s or 30 s in each block, respectively, and three minutes between blocks. The order of inter-stimulus intervals will be randomized. This study will allow a direct comparison between the five most frequently used formulas to calculate the rate of displacement in terms of their reproducibility. Our data will also inform on the effect of different inter-stimulus intervals on the rate of displacement. These results will provide helpful information on methodical considerations to determine the rate of displacement and may thus contribute to a standardized approach.
Background: In March 2020, the COVID-19 outbreak led to the declaration of a pandemic. The accompanying restrictions on public life caused a change in the training routines of athletes worldwide. The present study aimed to investigate the effects of a 13-week supervised home training program on physical performance, sleep quality, and health-related quality of life in professional youth soccer players during the first COVID-19 lockdown in Germany.
Methods: Eight professional soccer players (age range 16–19; height: 1.81 ± 0.07 m; body weight: 72.05 ± 6.96 kg) from a Bundesliga team in Germany participated in this study. During the lockdown, they trained 5–6 days per week with home-based training plans and were monitored via tracking apps and video training. To determine the effects of home training, measurements were taken before (March 2020) and after (June 2020) the home training period. Bioelectrical impedance analysis was used to determine body composition, and an isokinetic strength test and a treadmill step test, including lactate measurements, were used to measure physical performance. Two questionnaires were responded to in order to assess health-related quality of life [Short-Form 36 Health Survey (SF-36)] and sleep quality (Pittsburgh Sleep Quality Index).
Results: When comparing measurements before and after the home training period, we observed significant increases in the following variables: body weight (72.05 ± 6.96 kg vs. 73.50 ± 6.68 kg, p = 0.034), fat mass (11.99 ± 3.13 % vs. 13.98 ± 3.92 %, p = 0.030), body mass index (22.04 ± 0.85 kg/m2 vs. 22.49 ± 0.92 kg/m2, p = 0.049), and mental health component summary score (MCS) of the questionnaire SF-36 (53.95 ± 3.47 vs. 58.33 ± 4.50, p = 0.044). Scores on the general health (77.88 ± 14.56 vs. 89.75 ± 13.76, p = 0.025) and mental health (81.50 ± 9.30 vs. 90.00 ± 11.71, p = 0.018) subscales of the SF-36 also increased significantly.
Conclusion: The COVID-19 lockdown led to an increase in body composition parameters and showed an improvement in the MCS and scores on the general and mental health subscales of the SF-36. Physical performance and sleep quality could be maintained during the home training period. These observations may help trainers for future training planning during longer interruptions in soccer training.
High-intensity functional training (HIFT) has become a popular method in the sports and fitness sector. In contrast to unimodal approaches such as strength or endurance training, it has been hypothesized to induce concurrent adaptations in multiple markers of motor function. However, to date, the effectiveness of HIFT in this regard has not been studied. The present systematic review quantified the chronic effects of HIFT on motor function in healthy individuals. A multilevel meta-analysis with a robust random effects meta-regession model was used to pool the standardized mean differences (SMD) between (a) HIFT and (b) no-exercise (NEX) as well as conventional endurance, resistance and balance training for outcomes of muscle strength, endurance capacity and balance. The influence of possible effect modifiers such as program duration, session duration, age or sex was examined in a moderator analysis. Seventeen papers with moderate to high methodological quality (PEDro scale) were identified. Compared to NEX, HIFT had small to moderate positive effects on endurance capacity (SMD: 0.42, 95% CI 0.07–0.78, p = 0.03) and strength (0.60, 95% CI 0.02–1.18, p = 0.04) but no effect on balance (SMD: − 0.10, 95% CI − 1.13 to 0.92, p = 0.42). Regarding endurance, HIFT showed similar effectiveness as moderate-intensity endurance training (SMD: − 0.11, 95% CI − 1.17 to 0.95, p = 0.75) and high-intensity interval endurance training (SMD: − 0.15, 95% CI − 1.4 to 1.1, p = 0.66). No comparisons of HIFT vs. classical resistance or balance training were found. Moderator analyses revealed no influence of most effect modifiers. However, regarding endurance, females seemed to respond more strongly to HIFT in the comparison to NEX (p < .05). HIFT appears to represent an appropriate method to induce chronic improvements in motor function. While being superior to NEX and non-inferior to endurance training, current evidence does not allow a comparison against resistance and balance training. The impact of possible effect moderators should be further elucidated in future research.
In the application of range of motion (ROM) tests there is little agreement on the number of repetitions to be measured and the number of preceding warm-up protocols. In stretch training a plateau in ROM gains can be seen after four to five repetitions. With increasing number of repetitions, the gain in ROM is reduced. This study examines the question of whether such an effect occurs in common ROM tests. Twenty-two healthy sport students (10 m/12 f.) with an average age of 25.3 ± 1.94 years (average height 174.1 ± 9.8 cm; weight 66.6 ± 11.3 kg and BMI 21.9 ± 2.0 kg/cm2) volunteered in this study. Each subject performed five ROM tests in a randomized order—measured either via a tape measure or a digital inclinometer: Tape measure was used to evaluate the Fingertip-to-Floor test (FtF) and the Lateral Inclination test (LI). Retroflexion of the trunk modified after Janda (RF), Thomas test (TT) and a Shoulder test modified after Janda (ST) were evaluated with a digital inclinometer. In order to show general acute effects within 20 repetitions we performed ANOVA/Friedman-test with multiple comparisons. A non-linear regression was then performed to identify a plateau formation. Significance level was set at 5%. In seven out of eight ROM tests (five tests in total with three tests measured both left and right sides) significant flexibility gains were observed (FtF: p < 0.001; LI-left/right: p < 0.001/0.001; RF: p = 0.009; ST-left/right: p < 0.001/p = 0.003; TT-left: p < 0.001). A non-linear regression with random effects was successfully applied on FtF, RF, LI-left/right, ST-left and TT-left and thus, indicate a gradual decline in the amount of gained ROM. An acute effect was observed in most ROM tests, which is characterized by a gradual decline of ROM gain. For those tests, we can state that the acute effect described in the stretching literature also applies to the performance of typical ROM tests. Since a non-linear behavior was shown, it is the decision of the practitioner to weigh up between measurement accuracy and expenditure. Researchers and practitioners should consider this when applying ROM assessments to healthy young adults.
Many sports employ caloric restriction (CR) to reduce athletes’ body mass. During these phases, resistance training (RT) volume is often reduced to accommodate recovery demands. Since RT volume is a well-known anabolic stimulus, this review investigates whether a higher training volume helps to spare lean mass during CR. A total of 15 studies met inclusion criteria. The extracted data allowed calculation of total tonnage lifted (repetitions × sets × intensity load) or weekly sets per muscle group for only 4 of the 15 studies, with RT volume being highly dependent on the examined muscle group as well as weekly training frequency per muscle group. Studies involving high RT volume programs (≥ 10 weekly sets per muscle group) revealed low-to-no (mostly female) lean mass loss. Additionally, studies increasing RT volume during CR over time appeared to demonstrate no-to-low lean mass loss when compared to studies reducing RT volume. Since data regarding RT variables applied were incomplete in most of the included studies, evidence is insufficient to conclude that a higher RT volume is better suited to spare lean mass during CR, although data seem to favor higher volumes in female athletes during CR. Moreover, the data appear to suggest that increasing RT volume during CR over time might be more effective in ameliorating CR-induced atrophy in both male and female resistance-trained athletes when compared to studies reducing RT volume. The effects of CR on lean mass sparing seem to be mediated by training experience, pre-diet volume, and energy deficit, with, on average, women tending to spare more lean mass than men. Potential explanatory mechanisms for enhanced lean mass sparing include a preserved endocrine milieu as well as heightened anabolic signaling.
Background: The aim is to investigate to what extent the different oral protections compared to the habitual occlusion affect the upper body posture in statics and during taekwondo-specific movement.
Methods: 12 Taekwondoka (5 f/7 m) of German national team were measured by using a 3d back scanner and an ultrasonic distance measuring (upright stand, taekwondo attack and defense movement, two taekwondo specific combinations) in habitual occlusion, with a custom-made and ready-made mouth protection
Results: There are no significant changes in the upper body posture (p ≥ 0.05). Depending on the dynamic measurements, different significant reactions of the spinal position were found while wearing the custom made mouthguard or the ready-made mouthguard according to the conducted movement.
Conclusion: The measured changes in dynamic movements are not clinical relevant. Based on the positive responses from the participants, the custom-made mouth protection can be recommended combined with an individual analysis.
Anarchival practises : the Clanwilliam Arts Project as re-imagining custodianship of the past
(2023)
Where is the past? It is not really behind us, but with us, constantly imagined and re-imagined in public discourse through historical narrations. Using the Clanwilliam Arts Project as a case study, this volume is founded on the 'anarchive', a conceptual constellation that positions the past in relation to the present, bringing into view strategies to facilitate remembering beyond the colonial archive.
Hintergrund: Der eigene Körper ist das zentrale Arbeitsinstrument eines*einer Tanzpädagog*in (TP) innerhalb der Bewegungsvermittlung. Bisher fehlen Erkenntnisse über die subjektive Wahrnehmung der eigenen berufsassoziierten Gesundheit und Zufriedenheit sowie die Identifizierung gesundheitsbelastender Berufsmerkmale.
Methodik: Im Rahmen einer fragebogenbasierten Querschnittserhebung wurde eine Kohorte von TP in Deutschland zur eigenen Gesundheit und generellen Berufszufriedenheit und belastenden Aspekten im Zusammenhang mit ihrer Berufsausübung untersucht. Zusätzlich wurden allgemeine anthropometrische und soziodemographische Merkmale erfasst. Neben der Betrachtung der Gesamtkohorte wurde auf geschlechtsspezifische Unterschiede getestet. In die statistische Analyse wurden n = 232 TP (m: 51/w: 181) im Alter von 43,1 ± 11,0 Jahren eingeschlossen.
Ergebnisse: Der allgemeine Gesundheitszustand wurde von 85,3 % der Befragten mit „befriedigend“ (26,1 %) bis „sehr gut“ (14,7 %) beurteilt. 59,2 % der Tanzpädagog*innen schätzten ihre Gesundheit „gut“ (35,3 %) bis „sehr gut“ ein. Es herrschte eine hohe Zufriedenheit mit der eigenen Berufsausübung für 80 % der Teilnehmenden. Die TP fühlten sich überwiegend in der Lage (trifft „voll & ganz“ bzw. „eher zu“), mit den physischen (75,7 %) und psychischen Berufsanforderungen (70,3 %) umzugehen. Als belastende Berufsmerkmale in der Eigenwahrnehmung können neben Zukunftsängsten (51,5 %) vor allem arbeitsorganisatorische (fehlende Zeit für Familie und Freunde bei 28,4 %) und ökonomische Aspekte (Einkommensunsicherheit bei 61,0 % und fehlende Altersabsicherung bei 65,7 %) herausgestellt werden.
Diskussion: Die Berufsausübung als TP geht mit einer hohen generellen Zufriedenheit und einem positiven Empfinden des eigenen Gesundheitszustandes einher. Eine Bestätigung dieser positiven Ergebnisse durch Verletzungs- und Erkrankungsstatistiken steht noch aus. Darüber hinaus wäre eine Verbesserung arbeitsorganisatorischer und ökonomischer Aspekte wünschenswert.
Im Bobsport herrscht Konsens, dass die Startphase von zentraler Bedeutung für eine gute Endzeit ist. Dennoch hat sich die Sportwissenschaft mit der Frage, wie der Bobstart gelingt, bis dato kaum auseinandergesetzt. Der Beitrag holt dies in Form einer leibphänomenologischen Analyse der Startphase im Viererbob nach, indem er sein Augenmerk sowohl auf die leibliche Kommunikation der Athleten untereinander als auch zwischen ihnen und ihrem Sportgerät richtet. Theoretisches Fundament hierfür ist die Leibphänomenologie von Hermann Schmitz, empirische Grundlage sind problemzentrierte Interviews mit acht Kaderathleten des Bob- und Schlittenverbands für Deutschland (BSD). Zentrales Ergebnis der Untersuchung ist erstens, dass für das Gelingen des Viererbobstarts vor allem die antagonistisch-einseitige Einleibung der Athleten untereinander wie auch der Athleten mit dem Bob bedeutsam ist. Zweitens erweist sich die solidarische Einleibung der Athleten als wichtige Bedingung und gleichermaßen spürbarer Ausdruck eines gelungenen Viererbobstarts. Der Text präsentiert damit einen vollkommen neuen Blick auf den Bobsport. Mit seinem theoretisch-konzeptionellen Fokus auf leibliche Kommunikation im Sport liefert er darüber hinausgehend einen innovativen Beitrag zur phänomenologischen Sportforschung, wie er generell die fruchtbare Verbindung von Philosophie und empirischer Sportwissenschaft belegt.
KEIN SCHLUSSSTRICH! Bundesweites dezentrales Theaterprojekt zum NSU-Komplex : Die Nachbetrachtung
(2022)
Performance. Oper. Feminismus : Bemerkungen zu "7 Deaths of Maria Callas" von Marina Abramović
(2022)
Auf der Bühne der Deutschen Oper liegt eine Frau in einem Bett. Wir blicken, so ist dem Programmheft zu entnehmen, in die Rekonstruktion eines historischen Schlafzimmers. Maria Anna Sofia Cecilia Kalogeropoulou soll hier gewohnt haben, besser bekannt unter ihrem Künstlernamen Maria Callas. [...] Bevor Abramović in Kalogeropoulous Schlafzimmer erwacht, gab es sieben Kurzfilme zusehen, die als filmische Kommentare auf sieben Bühnentode des klassischen Opernrepertoires konzipiert wurden. In der Reihenfolge ihres Ablebens treten auf: Violetta, Tosca, Desdemona, Cio-Cio-San, Carmen, Lucia und Norma. In den Filmen lässt sich Abramović von deren jeweiligen Todesarten inspirieren: Abramović stürzt von einem Turm, Abramović wird von einer Schlange erwürgt, Abramović zertrümmert im Wahnsinn Mobiliar usw., alles bei ununterbrochenem Einsatz der Zeitlupe. Den Filmen wird die sie jeweils inspirierende Szene live musikalisch zur Seite gestellt, jede Figur dabei von einer anderen Sängerin verkörpert. Allerdings kommen in den meisten Fällen nicht die tatsächlichen Todesszenen der betreffenden Dramatis Personae zur Aufführung, sondern ein Potpourri ihrer vermeintlich schönsten Melodien. [...] Das fundamentale dramaturgische Problem der "7 Deaths of Maria Callas" erklärt sich aber erst mit Blick auf eine Installation, die Abramović auf Grundlage derselben Zusammenstellung von Film und Musik, allerdings unter Zuhilfenahme von historischen Aufnahmen von Kalogeropoulou präsentiert hat. In dieser Version, unter dem Titel "7 Deaths" in der Londoner Lisson Gallery gezeigt, entfaltet sich ein intimer Dialog zwischen deutlich voneinander zu unterscheidenden Medien und Stilen. Die Autonomie der musikalischen Darbietung geht in der Bühnenversion verloren, der Charakter der Installation verschiebt sich in Richtung Stummfilm mit Live-Musik. Letztere hat nur noch begleitende Funktion und kann weder von der Aura des Historischen noch von den stilbildenden Interpretationen der Callas profitieren. Noch in ihrer Abwesenheit stellt Kalogeropoulou aber an performativer Intensität alles zur Aufführung Kommende in den Schatten. Denn während Abramović bei dem Versuch scheitert, sich mit ihrer physischen Präsenz gegen ihren eigenen Celebrity-Status zu behaupten, treten die Sängerinnen des Abends mit dem Medienphänomen Maria Callas in Konkurrenz. Eine Übermacht völlig anderen Kalibers.