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Record 3 of 2620
Inflight exercise affects stand test responses after space flight
External Online Source: doi:10.1097/00005768-199912000-00010
Author and Affiliation:
Lee, S. M.(NASA Johnson Space Center, Houston TX United States)
Moore, A. D. Jr
Fritsch-Yelle, J. M.
Greenisen, M. C.
Schneider, S. M.
Abstract: PURPOSE: The purpose of this study was to determine whether exercise performed by Space Shuttle crew members during short-duration space flights (9-16 d) affects the heart rate (HR) and blood pressure (BP) responses to standing within 2-4 h of landing. METHODS: Thirty crew members performed self-selected inflight exercise and maintained exercise logs to monitor their exercise intensity and duration. Two subjects participated in this investigation during two different flights. A 10-min stand test, preceded by at least 6 min of quiet supine rest, was completed 10-15 d before launch (PRE) and within 4 h of landing (POST). Based upon their inflight exercise records, subjects were grouped as either high (HIex: > or = 3 times/week, HR > or = 70% HRmax, > or = 20 min/session, N = 11), medium (MEDex: > or = 3 times/week, HR < 70% HRmax, > or = 20 min/session, N = 10), or low (LOex: < or = 3 times/week, HR and duration variable, N = 11) exercisers. HR and BP responses to standing were compared between groups (ANOVA, P < or = 0.05). RESULTS: There were no PRE differences between the groups in supine or standing HR and BP. Although POST supine HR was similar to PRE, all groups had an increased standing HR compared with PRE. The increase in HR upon standing was significantly greater after flight in the LOex group (36 +/- 5 bpm) compared with HIex or MEDex groups (25 +/- 1 bpm; 22 +/- 2 bpm). Similarly, the decrease in pulse pressure (PP) from supine to standing was unchanged after space flight in the MEDex and HIex groups but was significantly greater in the LOex group (PRE: -9 +/- 3; POST: -19 +/- 4 mm Hg). CONCLUSIONS: Thus, moderate to high levels of inflight exercise attenuated HR and PP responses to standing after space flight.
Publication Date: Dec 01, 1999
Document ID:
20040141726
(Acquired Nov 09, 2004)
Subject Category: LIFE SCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Medicine and science in sports and exercise (ISSN 0195-9131); Volume 31; 12; 1755-62
Publisher Information: United States
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: PHYSICAL EXERCISE; POSTURE; ADULTS; BLOOD PRESSURE; FEMALES; GRAVITATION; HEART RATE; MALES; SPACE SHUTTLE MISSIONS
Other Descriptors: EXERCISE; POSTURE; SPACE FLIGHT; ADULT; BLOOD PRESSURE; FEMALE; GRAVITATION; HEART RATE; HUMAN; MALE; SUPPORT, NON-U.S. GOV'T; SUPPORT, U.S. GOV'T, NON-P.H.S; NASA CENTER JSC; NASA DISCIPLINE CARDIOPULMONARY; NASA PROGRAM BIOMEDICAL RESEARCH AND COUNTERMEASURES; FLIGHT EXPERIMENT; STS SHUTTLE PROJECT; MANNED; SHORT DURATION
Availability Source: Other Sources
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