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R Valdez

Publications and source records attributed to R Valdez.

60 records · Page 4Linked to original sources
PubMed1978

Cardiovascular responses to dynamic and static effort soon after myocardial infarction. Application to occupational work assessment.

Static and dynamic work involving the arms and the legs was performed by 40 men seven weeks after myocardial infarction. Leg ergometry produced a significantly higher peak work load, systolic blood pressure (BPs), heart rate (HR), and HR X BPs X 10(-2) product (DP) than did arm ergometry: 842 +/- 178 vs 546 +/- 135 kg-m/min, 176 +/- 24 vs 154 +/- 19 mm Hg and 256 +/- 54 vs 219 +/- 48 (SD). Peak heart rates were 145 and 142. Endpoints were primarily muscular and generalized fatigue and dyspnea. Ischemic abnormalities and ventricular ectopy were more frequent with leg ergometry. Sustained forearm lifting elicited higher HR, PBs and DP responses than sustained handgrip contraction: 95 +/- 16 vs 91 +/- 16 beats/min, 162 +/- 18 vs 152 +/- 17 mm Hg and 154 +/- 33 vs 139 +/- 33 (SD). Ischemic ST segment depression and significant ventricuar arrhythmias were infrequent with static effort. Dynamic leg testing is superior to dynamic or static arm testing in assessing the capacity of patients to perform physical work tasks after myocardial infarction.

Adult↗
PubMedDate not supplied

[Blood lipid levels and atherogenic risk in an open urban population].

We present the results of a population based survey in a low income area of Mexico City. The equivalent of three census tracts were identified and enumerated. The age eligible population (35-64 yrs) in the zone comprised 2253 subjects. A household interview was obtained in 94.8% and a physical exam with laboratory determinations was performed in 62.6% of the total population. The total number of cases studied was 1411 of which 565 were males and 846 were females. Age group distribution was as follows: group 1 (35-44 y) 235 men, 367 women; group 2 (45-54 y) 203 men, 289 women; and group 3 (55-64 y) 127 men, 190 women. The physical exam included the following measurements: height, weight, blood pressure measured with a random zero sphygmomanometer, subscapular and triceps skinfold measurements, and waist and hip circumferences. The body mass index (BMI) was calculated according to a standard formula; the subscapular/triceps ratio was used as centrality index and the waist/hip ratio was used to indicate upper/lower body fat distribution. In addition, the following blood lipids were measured following a 12 hr fast: total and HDL, LDL, VLDL-cholesterol as well as triglycerides. The mean BMI for women was 28.9 kg/m2, for men it was 27 kg/m2. The subscapular/triceps skinfold ratio revealed a predominantly central fat distribution pattern in both sexes. The waist/hip circumference ratio showed a predominantly lower fat distribution pattern also in both sexes.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗