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Journal of the Korean Academy of Rehabilitation Medicine 1994;18(2):11.
Responses of Blood Pressure and Heart Rate to Isometric Contractions of Large and Small Muscle Groups
Tai Sik Yoon, M.D., Ji Cheol Shin, M.D., Joo Sup Kim, M.D., Seoug Hyun Park, M.D. , Jong Keun Kang, M.D.
Department of Rehabilitation Medicine, Yonsei University College of Medicine
근위 및 원위 근육에서 최대 등척성 수축시 혈압 및 심박수 비교
윤태식*, 신지철, 김주섭, 박승현, 강종권
이화여자대학교 의과대학* 및 연세대학교 의과대학 재활의학교실

The purpose of this study was to investigate the influence of the size of active muscle mass on the responses of the blood pressure and the heart rate to isometric contraction.

The isometric torques of the flexors and extensors of the knee (90o), ankle (0o), elbow (90o) and wrist (0o) were measured for 6 seconds in 30 normal, healthy men, between the ages of 20 and 29 years, using the Extremity Training & Rehabilitation System (Model No. Cybex 340).

The peak torque and the time to peak torque were measured for each contraction. In addition, heart rate and blood pressure were recorded simultaneously at rest and immediately following contraction completion at 1 and 3 minutes.

The increase in heart rate and blood pressure during isometric contraction was independent of the size of the contracting muscle mass (p<0.05). The mean increment ratio was 17.3% for systolic blood pressure, 13.2% for diastolic pressure and 39.9% for heart rate.

The mean rime to peak torque for the large muscle groups was longer than the mean time to peak torque for the small muscle groups (p<0.01).

It was concluded that the magnitude of the cardiovascular response to isometric exercise is not influenced by the size of the contracting muscle mass.

Key Words: Isometric exercise, Small versus large muscle mass, Blood pressure, Heart rate
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