فصلنامه دانشگاه علوم پزشکی جهرم (Jun 2009)
The effect of MCKENZIES exercises on Cardiovascular responses in khatam al_Anbia hospital personals in Zahedan
Abstract
Introduction: Repetitive exercises of the type recommended by McKenzie for the lumbar spine , such as flexion and extension exercises in standing ( FIS and EIS ) and lying positions ( FIL and EIL ) , have been used in the management of low back pain for 20 years . The Cardiovascular responses of exercises that performed in a lying position are well known. Therefore , the purpose of this study was to examine the Cardiovascular effects of 4 exercises used in the Mckenzie system. Materials and Methods:For this control trial ( before and after ) study 72 subjects without cardiovascular or cardiopulmonary disease and who were representative of people susceptible to low back pain were studied . 36 men and 36 women divided three groups ( low fat , normal ,high fat ) after determined BMI . Everyone performed 4 exercises in 4 days . Subjects performed sets of 10 , 15 and 20 repetitions of the assigned exercise , with a 20 minute rest between sets . Heart Rate , Blood Pressure , and rate-pressure product ( an index of myocardial work ) were recorded before and after each set of repetitions. Results . After 10 repetitions , flexion and extension in lying were more hemodynamically demanding than in standing . This trend persisted for 15 and 20 repetitions , however , at 20 repetitions the hemodynamic demands were different across exercise groups ( ie , FIL > EIL > FIS > EIS ) . Hemodynamically demanding were more in men due to women and also in high fat and due to normal and low fat ( ie:high fat>normal>low fat) Discussion and conclusion . Repetitive exercises of the type suggested by McKenzie for the lumbar spine can have hemodynamic effects in people with no cardiovascular or cardiopulmonary conditions . These effects may be important with respect to cardiac work , and patients for whom these exercises are indicated should have a cardiac and pulmonary risk factor assessment to determine whether heart rate and blood pressure should be monitored
