Heart rate as an estimator of oxygen consumption during manual postal delivery.

Abstract

Heart rate as an estimator of oxygen consumption during manual postal delivery. by Oja P, Ilmarinen J, Louhevaara V Key terms: heart rate; heavy work; manual postal delivery; oxygen consumption; prediction This article in PubMed: www.ncbi.nlm.nih.gov/pubmed/7134920Scand ; work environ health 8 (1982) [29][30][31][32][33][34][35][36] Heart rate as an estimator of oxygen consumption during manual postal delivery by Pekka Oja, PhD,I, 2 Juhani IImarinen, PhD,1 Veikko Louhevaara, LSc 1 OJA P, ILMARINEN J, LOUHEVAARA V. Heart rate as an estimator of oxygen consumption during manual postal delivery. Scand j work environ health 8 (1982) 29-36. Nine young healthy postmen performed three progressive maximal exercise tests (on a bicycle ergometer and with and without a 10-kg shoulder bag on a treadmill) for which the least-squares regression equations of heart rate (HR) on oxygen consumption (V02) were established. HR and V02 were then measured during five modes of simulated postal delivery: on level ground by foot (F), bicycle (B), and push-cart (C) and on stairs by foot (S/F) and push-cart (SiC). The respective work HR values were inserted into the three regression equations established for HR/V02, and V02 was solved for. The estimated V02 values tended to be systematically higher than the measured ones. The best regression proved to be that established for the treadmill plus mailbag; the regression coefficients between the measured and estimated V02S were higher than 0.75, and the percentage differences between the means of the measured and estimated values were no more than 10 Ofo for F and B delivery. All the regressions yielded inaccurate estimations of V02 for C, S/F and SIC delivery. It was concluded that HR is acceptable as an estimator of V02 only when the test work closely resembles the muscle work in the job.Key terms: heavy work, prediction.The direct means available for measuring oxygen consumption {V0 2 ) under field conditions are rather cumbersome. Thus many attempts have been made to develop methods for estimating energy consumption. Heart rate is one attractive measure for this estimation because of its linear dependability on V0 2 , within limits, during certain types of muscular work. Indeed, heart rate has been used as the basis for estimating both the daily energy expenditure (5, 6, 12, 15) and V0 2 of specified work such as coastal fishing (3, 13), housekeeping activities (2), building construction work (1), surgical operations (10), and postal delivery (11).Fordham et al (7) compared the measured and predicted V0 2 in light industrial work and found the "prediction

Validation of a new pocket computer assisted method for metabolic rate estimation in field studies

“…Ford ham's protocol still requires the measurement of vO, during the calibration procedure and therefore is of limited routine application in industrial situations. Contrary to the observations of Oja et al (1982) the closeness is rather good for M values above 200 Errors in the estimation of M using the pocket computer method may be due to the procedure itself. For instance at one workplace, the task involved simultaneous activity and displacement but the pocket computer considered only one of these components.…”

“…1983 In field studies, metabolic rate is generally deduced from heart rate (HR) levels, using a relation between oxygen consumption (VO,) and HR observed during an exercise test performed in the laboratory or, as suggested by Oja et al (1982), established for each subject by means of an exercise test conducted in conditions very close to those existing at the workplace investigated.…”

Cardiorespiratory Capacity of Thai Workers in Different Age and Job Categories.

“…Before the maximum the linearity of the VO 2 and HR relationship becomes asymptotic when the saturation level of oxygen in blood is reached and exercise is entirely based on the anaerobic energy production (Di Prampero, 1981;Wasserman et al, 1999). However, the high correlation between VO 2 and HR justifies the estimation of VO 2 max by calculating the linear regression equation of VO 2 and HR at submaximal incremental levels of exercise and by using in the prediction of the VO 2 max the average age-related maximal HR (Graham and Andrew, 1973;Oja et al, 1982;Astrand and Rodahl, 1986;Nielsen and Meyer, 1987;Mesquita et al, 1996;Noonan and Dean, 2000). The accuracy of this kind of VO 2 max-predictions is about ±10% (Kilbom, 1990).…”

Oxygen consumption and heart rate in different modes of manual postal delivery

“…This test was followed by three progressive maximal stress tests: the first on the treadmill without an extra load; the second on the treadmill with a 10 kg postal bag: and the third on the bicycle ergometer. The three different maximal tests were chosen primarily for the mkth~dolo~ical study, where the oxygen consumption during postal delivery was estimated from the heart rate (Oja et al 1982). Because the highest vO, max values were not systematically reached in any of these tests, we used the highest measured ~0 , m a x values for the calculations of the relative aerobic strain (RAS) independent of the test procedure.…”