Comparison of Impact Accelerations During Performance of Common Ballet Maneuvers: A Pilot Study.

INTRODUCTION: Ballet landings produce accelerations that are transmitted proximally up the kinetic chain. If overly excessive/repetitive, these "shocks" to the lower body may contribute to overuse injury. The shocks imposed by different ballet maneuvers are largely unknown at this time, making it difficult to appreciate the physical stresses associated with different maneuvers. Therefore, the purpose of this study was to compare the impact accelerations associated with different common ballet maneuvers. METHODS: As part of this study, 11 adolescent ballet dancers performed 9 different common ballet maneuvers: (1) glissade, (2) pas de chat, (3) petit jeté, (4) petit assemblé, (5) grand assemblé, (6) grand jeté, (7) saut de chat, (8) changement, and (9) entrechat quatre. An inertial sensor secured to the pelvis was used to record the peak resultant acceleration during landings ("impact acceleration"). A Friedman test was conducted to compare impact accelerations across the maneuvers and Wilcoxon signed-rank tests were conducted as pairwise comparisons. RESULTS: The omnibus test indicated that there were differences in impact accelerations among the maneuvers (P < .001). In general, the glissade (2.08 ± 0.47g), pes de chat (2.33 ± 0.23g), petit jeté (2.42 ± 0.29g), and petite assemblé (2.54 ± 0.47g) tended to be the lower impact maneuvers; the grand assemblé (2.90 ± 0.41g), grand jeté (2.99 ± 0.33g), and saut de chat (3.13 ± 0.54g) tended to be the more moderate impact maneuvers; and the changement (4.10 ± 0.48g) and entrechat quatre (4.32 ± 0.52g) tended to be higher impact maneuvers. CONCLUSION: These findings may provide clinicians and dance instructors with greater insight regarding the physical stresses imposed by different ballet maneuvers.

Lockdown under lockdown? Pandemic, the carceral and COVID-19 in British prisons.

The relationship between pandemic, or chronic infectious diseases, and the carceral, meaning set-apart spaces of enforced confinement for "wrong-doers," has a long, tangled history. It features in Foucault's inquiries into disciplinary power and its associated spatial formations, not least in the shape of the modern prison. Drawing lightly from Foucault's claims about disciplinary and biopolitical power, as well as on his anti-prison activism, this paper explores three possibilities for penal transformation arising during the early months of COVID-19 in UK prisons (circa March to August 2020). Consulting primary source material, these possibilities are respectively identified as "retrenching," "reworking" or "reducing" the carceral. A chief finding is that under the press of pandemic "emergency," the tilt of emphasis has been towards a retrenched or reworked "carceral state," disappointing any promise of abolition, let alone more humble reduction in carceral conditions. The "biological sub-citizens" of prisons are hence being left especially vulnerable to the press of pandemic, in part precisely because of how carceral spatialities are being intensified.