Thesis (M Sport Sc (Sport Science))--University of Stellenbosch, 2009. / ENGLISH ABSTRACT: It is well-known that acute and chronic aerobic and resistance exercise results in
decreased blood pressure (BP) in hypertensive individuals. There is little evidence
that water exercise has a similar effect on BP response. There is also no certainty
regarding the magnitude and duration of post exercise hypotension (PEH) after either
land or water-based exercise. Most studies were also performed under controlled
laboratory conditions and very few characterised the PEH response under real life
conditions.
The current study endeavoured to examine the magnitude and duration of PEH after
an acute session of water- and land-based exercise during free living conditions in
persons with mild to moderate hypertension.
Twenty-one men and women (aged 52 ± 10 years) volunteered for the study. All
participants were pre-hypertensive or hypertensive. Participants completed a no
exercise control session, a water exercise session and a combined aerobic and
resistance land exercise session in random order. After all three sessions,
participants underwent 24 hour monitoring using an Ergoscan ambulatory BP
monitoring device. Systolic blood pressure (SBP), diastolic blood pressure (DBP),
mean arterial pressure (MAP) and heart rate (HR) were monitored to determine
changes from resting values after each session and to compare the PEH responses
between land and water exercise.
Overall, the land exercise treatment caused a 3.6 mmHg lower average SBP over 24
hours than the control treatment (P = 0.04). The average difference over 24 hours
between the water and control treatments was 2.2 mmHg and between land and
water exercise it was 1.5 mmHg (P > 0.05). During daytime, both land and water
exercise resulted in significantly lower SBP (12.7 and 11.3 mmHg) compared to the
control session (2.3 mmHg). The PEH response lasted for 24 hours after land
exercise and nine hours after water exercise. There was no difference in the daytime
DBP for the three treatments (P > 0.05). Although all three groups showed
significant reductions during night time, both exercise treatments showed greater
nocturnal falls in SBP, DBP and MAP than the control treatment. / AFRIKAANSE OPSOMMING: Dit is alombekend dat akute en chroniese aërobiese- en weerstandsoefening tot ‘n
afname in bloeddruk (BD) lei in persone met hipertensie. Daar is egter min getuienis
dat wateroefening dieselfde effek op die bloeddruk respons het. Daar is ook nie
sekerheid oor die grootte en duur van post-oefening hipotensie na water- of
landoefening nie. Die meeste studies is onder gekontrolleerde laboratorium
omstandighede gedoen en min resultate is beskikbaar onder alledaagse
lewensomstandighede.
Die huidige studie het gepoog om die grootte en duur van die post-oefening
hipotensie respons in persone met ligte tot matige hipertensie onder alledaagse
omstandighede na ‘n akute sessie van water- en landgebaseerde oefening te
ondersoek.
Een-en-twintig mans en vrouens (ouderdom 52 ± 10 jaar) het ingewillig om aan die
studie deel te neem. Alle deelnemers was hipertensief of pre-hipertensief. Alle
deelnemers het ‘n kontrolesessie, ‘n wateroefeningsessie en ‘n gekombineerde
aërobiese en weerstands landoefensessie, in lukrake volgorde, voltooi. Na elke
sessie het die deelnemers 24 uur bloeddrukmonitering met ‘n Ergoscan wandelende
bloeddruk monitor ondergaan. Sistoliese bloeddruk (SBD), diastoliese bloeddruk
(DBD), gemiddelde arteriële bloeddruk en harttempo (HT) is gemonitor om die
veranderinge vanaf rustende waardes na elke sessie te bepaal en om die
hipotensiewe respons na land- en wateroefening te vergelyk.
Landoefening het ‘n 3.6 mmHg laer gemiddelde SBD oor 24 uur tot gevolg gehad in
vergelyking met die kontrolesessie (P = 0.04). Die gemiddelde verskil oor 24 uur
tussen die water- en kontrolesessies was 2.2 mmHg en 1.5 mmHg tussen die land
en water oefensessies (P > 0.05). Gedurende die dag het beide die land- and
wateroefening gelei tot beduidende laer SBD (12.7 en 11.3 mmHg) in vergelyking
met die kontrolesessie (2.3 mmHg). Die post-oefening hipotensie het 24 uur geduur
na die landoefening en nege uur na die wateroefening. Daar was geen verskil in
DBD gedurende die dag tussen die drie groepe nie (P > 0.05).
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/1825 |
| Date | 12 1900 |
| Creators | Esterhuyse, Aletta Maria |
| Contributors | Terblanche, Elmarie, University of Stellenbosch. Faculty of Education. Dept. of Sport Science. |
| Publisher | Dissertations -- Sport science, Theses -- Sport science |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | Unknown |
| Type | Thesis |
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