Hemodynamic Responses of Isokinetic Trunk Rotatory Exercise

The purpose of this study was to investigate how hemodynamic responses are influenced by changes in both angular velocity and exercise repetition during isokinetic trunk rotatory exercise. This study was performed in six healthy adult men at three different angular velocities (60, 90, and 120 deg/sec) and with three different exercise repetitions (5, 10, and 15 repetitions). Heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP), and mean blood pressure (MBP) were measured non-invasively with a sphygmomanometer. The time to pre exercise value (recovery time) for HR, SBP, DBP, and MBP was measured. In addition, peak HR, SBP, DBP, MBP, and Rate-Pressure. Product (RPP; HR × SBP × 10^-2) were measured. Peak HR, SBP, DBP, MBP, and RPP significantly increased at each angular velocity and each repetition as compared with the control values (p < 0.05). <br>At the same angular velocity, peak HR significantly increased with sustained repetitions for each of the studied angular velocities, i.e., 10 repetitions > 5 repetitions, 15 repetitions > 5 repetitions and 15 repetitions > 10 repetitions. Peak SBP significantly increased with sustained repetitions at 60 deg/sec, i.e., 10 repetitions > 5 repetitions and 15 repetitions > 5 repetitions. Both peak DBP and peak MBP significantly increased with sustained repetitions at 60 deg/sec, i.e., 10 repetitions > 5 repetitions and 15 repetitions > 5 repetitions and at 90 deg/sec, i.e., 10 repetitions > 5 repetitions and 15 repetitions > 5 repetitions and at 120 deg/sec, i.e., 15 reptitions > 5 repetitions and 15 repetitions > 10 repetitions. Peak RPP significantly increased with sustained repetitions at 60 and 90 deg/sec, i.e., 10 repetitions > 5 repetitions arid 15 repetitions > 5 repetitions. The recovery time for HR, SBP, DBP, and MBP progressively increased with the number of repetitions. <br>At the same execise repetition, peak HR significantly increased with sustained repetitions for each of the studied repetitions, i.e., 60 deg/sec > 120 deg/sec. Peak DBP significantly increased for 10 and 15 repetitions, i.e., 60 deg/sec > 120 deg/sec. Peak RPP significantly increased for 5 repetitions, i.e., 60 deg/sec > 90deg/sec. <br>These findings indicate that the following are important to safely measure the hemodynamic response to isokinetic trunk rotatory exercise: <br>(1) The number of repetitions should be kept low, at slower angular velocity. <br>(2) The angular velocity should be kept at faster speed, for many exercise repetitions.