Cerebral blood flow velocity response induced by a 70-hPa Valsalva manoeuvre associated with normo-and hypergravity in humans
Anti-G straining manoeuvres, derived from the Valsalva manoeuvre (VM), are physiological methods for protecting fighter pilots against positive accelerations (+Gz). The aim of this study was to investigate the effects of a standard VM on cerebral haemodynamics, in normo- and hypergravity. In six hea...
Gespeichert in:
| Hauptverfasser: | , , , , |
|---|---|
| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
March 1996
|
| In: |
European journal of applied physiology
Year: 1996, Jahrgang: 72, Heft: 5, Pages: 502-508 |
| ISSN: | 1439-6327 |
| DOI: | 10.1007/BF00242282 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/BF00242282
|
| Verfasserangaben: | G. Ossard, J.M. Clère, M. Kerguélen, F. Melchior, J. Seylaz |
MARC
| LEADER | 00000caa a2200000 c 4500 | ||
|---|---|---|---|
| 001 | 1859061001 | ||
| 003 | DE-627 | ||
| 005 | 20240311154040.0 | ||
| 007 | cr uuu---uuuuu | ||
| 008 | 230907s1996 xx |||||o 00| ||eng c | ||
| 024 | 7 | |a 10.1007/BF00242282 |2 doi | |
| 035 | |a (DE-627)1859061001 | ||
| 035 | |a (DE-599)KXP1859061001 | ||
| 035 | |a (OCoLC)1425892157 | ||
| 040 | |a DE-627 |b ger |c DE-627 |e rda | ||
| 041 | |a eng | ||
| 084 | |a 32 |2 sdnb | ||
| 100 | 1 | |a Ossard, Gérard |e VerfasserIn |0 (DE-588)1300947225 |0 (DE-627)1858760984 |4 aut | |
| 245 | 1 | 0 | |a Cerebral blood flow velocity response induced by a 70-hPa Valsalva manoeuvre associated with normo-and hypergravity in humans |c G. Ossard, J.M. Clère, M. Kerguélen, F. Melchior, J. Seylaz |
| 264 | 1 | |c March 1996 | |
| 300 | |a 7 | ||
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a Computermedien |b c |2 rdamedia | ||
| 338 | |a Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a Gesehen am 07.09.2023 | ||
| 520 | |a Anti-G straining manoeuvres, derived from the Valsalva manoeuvre (VM), are physiological methods for protecting fighter pilots against positive accelerations (+Gz). The aim of this study was to investigate the effects of a standard VM on cerebral haemodynamics, in normo- and hypergravity. In six healthy male volunteers, we investigated the cerebral blood flow velocity response induced by a 10-s, 70-hPa (52.5 mmHg) VM, under normogravity, + 2, + 3 and + 4 Gz acceleration plateaus. Mean blood flow velocity ($$\overline {{\text{BFV}}} $$) in middle cerebral artery was monitored by transcranial Doppler velocimetry. In normogravity, no significant variation in $$\overline {{\text{BFV}}} $$was observed at the onset of VM. After a maximal period of 1.2 s, while VM was sustained, $$\overline {{\text{BFV}}} $$decreased significantly (P < 0.05). Following the end of the manoeuvre $$\overline {{\text{BFV}}} $$did not change significantly. When the expiratory pressure had returned to the control value, $$\overline {{\text{BFV}}} $$was transiently increased (P < 0.05) before returning to control values. During hypergravity, $$\overline {{\text{BFV}}} $$was significantly decreased at + 3 and + 4 Gz (P < 0.05) before the onset of VM. While performing VM under + Gz, the main difference compared to the normogravity condition was a significant increase of $$\overline {{\text{BFV}}} $$(P < 0.05) at the onset of the manoeuvre. Our findings would suggest that when performed under + Gz stress, a 70-hPa VM can transiently improve cerebral haemodynamics. However, when VM is sustained for more than 1.2 s it results in a lasting decrease of cerebral perfusion which may lower + Gz tolerance. | ||
| 650 | 4 | |a + Gz stress | |
| 650 | 4 | |a Cerebral perfusion pressure | |
| 650 | 4 | |a Middle cerebral artery | |
| 650 | 4 | |a Transcranial Doppler | |
| 700 | 1 | |a Clère, Jean-Michel |e VerfasserIn |0 (DE-588)1300946911 |0 (DE-627)1858760941 |4 aut | |
| 700 | 1 | |a Kerguélen, Michel |e VerfasserIn |4 aut | |
| 700 | 1 | |a Melchior, Frauke |d 1962- |e VerfasserIn |0 (DE-588)1044947144 |0 (DE-627)773153624 |0 (DE-576)370602919 |4 aut | |
| 700 | 1 | |a Seylaz, Jacques |e VerfasserIn |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t European journal of applied physiology |d Berlin : Springer, 1928 |g 72(1996), 5 vom: März, Seite 502-508 |h Online-Ressource |w (DE-627)253722780 |w (DE-600)1459054-2 |w (DE-576)072372605 |x 1439-6327 |7 nnas |a Cerebral blood flow velocity response induced by a 70-hPa Valsalva manoeuvre associated with normo-and hypergravity in humans |
| 773 | 1 | 8 | |g volume:72 |g year:1996 |g number:5 |g month:03 |g pages:502-508 |g extent:7 |a Cerebral blood flow velocity response induced by a 70-hPa Valsalva manoeuvre associated with normo-and hypergravity in humans |
| 856 | 4 | 0 | |u https://doi.org/10.1007/BF00242282 |x Verlag |x Resolving-System |z lizenzpflichtig |3 Volltext |
| 951 | |a AR | ||
| 992 | |a 20230907 | ||
| 993 | |a Article | ||
| 994 | |a 1996 | ||
| 998 | |g 1044947144 |a Melchior, Frauke |m 1044947144:Melchior, Frauke |p 4 | ||
| 999 | |a KXP-PPN1859061001 |e 4373633339 | ||
| BIB | |a Y | ||
| SER | |a journal | ||
| JSO | |a {"note":["Gesehen am 07.09.2023"],"type":{"media":"Online-Ressource","bibl":"article-journal"},"recId":"1859061001","language":["eng"],"person":[{"roleDisplay":"VerfasserIn","display":"Ossard, Gérard","role":"aut","family":"Ossard","given":"Gérard"},{"role":"aut","display":"Clère, Jean-Michel","roleDisplay":"VerfasserIn","given":"Jean-Michel","family":"Clère"},{"display":"Kerguélen, Michel","roleDisplay":"VerfasserIn","role":"aut","family":"Kerguélen","given":"Michel"},{"family":"Melchior","given":"Frauke","display":"Melchior, Frauke","roleDisplay":"VerfasserIn","role":"aut"},{"given":"Jacques","family":"Seylaz","role":"aut","display":"Seylaz, Jacques","roleDisplay":"VerfasserIn"}],"title":[{"title":"Cerebral blood flow velocity response induced by a 70-hPa Valsalva manoeuvre associated with normo-and hypergravity in humans","title_sort":"Cerebral blood flow velocity response induced by a 70-hPa Valsalva manoeuvre associated with normo-and hypergravity in humans"}],"physDesc":[{"extent":"7 S."}],"relHost":[{"recId":"253722780","language":["eng"],"note":["Gesehen am 19.08.09"],"disp":"Cerebral blood flow velocity response induced by a 70-hPa Valsalva manoeuvre associated with normo-and hypergravity in humansEuropean journal of applied physiology","type":{"media":"Online-Ressource","bibl":"periodical"},"titleAlt":[{"title":"Applied physiology"},{"title":"Arbeitsphysiologie"},{"title":"Internationale Zeitschrift für angewandte Physiologie einschließlich Arbeitsphysiologie"},{"title":"European journal of applied physiology and occupational physiology"}],"part":{"text":"72(1996), 5 vom: März, Seite 502-508","volume":"72","extent":"7","year":"1996","pages":"502-508","issue":"5"},"pubHistory":["1.1928/29 -"],"title":[{"title":"European journal of applied physiology","title_sort":"European journal of applied physiology"}],"physDesc":[{"extent":"Online-Ressource"}],"id":{"zdb":["1459054-2"],"eki":["253722780"],"issn":["1439-6327","1432-1025"]},"origin":[{"publisher":"Springer ; Springer","dateIssuedKey":"1928","dateIssuedDisp":"1928-","publisherPlace":"Berlin ; Heidelberg ; Berlin ; Heidelberg ; New York, NY"}]}],"name":{"displayForm":["G. Ossard, J.M. Clère, M. Kerguélen, F. Melchior, J. Seylaz"]},"origin":[{"dateIssuedDisp":"March 1996","dateIssuedKey":"1996"}],"id":{"doi":["10.1007/BF00242282"],"eki":["1859061001"]}} | ||
| SRT | |a OSSARDGERACEREBRALBL1996 | ||