Hemodynamic response to work with different muscle groups, sitting and supine.

Stenberg, Jesper; Åstrand, Per‐Olof; Ekblom, Björn; Royce, Joseph; Saltin, Bengt

doi:10.1152/jappl.1967.22.1.61

Cited by 317 publications

(172 citation statements)

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“…It is well known that for a given V0 2 the heart rate is higher in static than in dynamic work 1(9) and higher in work with small muscle mass than in that with large muscle mass (14). This phenomenon would lead to an error in the estimation of V0 2 from the heart rate/V0 2 relationship whenever the test work and the actual work differ with respect to the type of contraction and the muscle groups involved.…”

Section: Discussionmentioning

confidence: 99%

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

Oja¹,

Ilmarinen²,

Louhevaara³

1982

Scand J Work Environ Health

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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

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Section: Discussionmentioning

confidence: 99%

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

Oja¹,

Ilmarinen²,

Louhevaara³

1982

Scand J Work Environ Health

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“…It is generally acknowledged that substantial differences exist between arm cranking and lower body exercise, such as cycling. For example, the maximal aerobic capacity of the upper body in untrained subjects seems to be limited by peripheral factors, including a small involved muscle mass, a greater proportion of type II fibres (Johnson et al 1973), a low density of capillaries (Turner et al 1997;Calbet et al 2005) and mitochondria (Turner et al 1997), and a greater peripheral resistance (Stenberg et al 1967). In addition, arm cranking exercise results in greater physiological stress (RPE and HR) at the same VO 2 (Leicht 2008) when compared with cycling in untrained subjects.…”

Section: Minmentioning

confidence: 99%

Aerobic power and peak power of elite America’s Cup sailors

2009

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Big-boat yacht racing is one of the only able bodied sporting activities where standing armcranking ('grinding') is the primary physical activity. However, the physiological capabilities of elite sailors for standing arm-cranking have been largely unreported. The purpose of the study was to assess aerobic parameters, VO 2peak and lactate threshold (OBLA), and anaerobic performance, torque-and power-crank velocity relationships and therefore peak power (P max ) and optimum crank-velocity (ω opt ), of America's Cup sailors during standing arm-cranking. Thirty-three elite professional sailors performed a step test to exhaustion, and a subset of ten grinders performed maximal 7 s isokinetic sprints at different crank velocities, using a standing arm-crank ergometer. VO 2peak was 4.7(0.5) L/min (range: 3.6-5.5 L/min) at a power output of 332(44) W (range: 235-425 W). OBLA occurred at a power output of 202(31) W (61% of W max ) and VO 2 of 3.3(0.4) L/min (71% of VO 2peak ). The torque-crank velocity relationship was linear for all participants (r=0.9(0.1)). P max was 1420(37) W (range: 1192-1617 W), and ω opt was 125(6) rpm. These data are among the highest upper-body anaerobic and aerobic power values reported. The unique nature of these athletes, with their high fat-free mass and specific selection and training for standing arm cranking, likely accounts for the high values. The influence of crank velocity on peak power implies that power production during on-board 'grinding' may be optimised through the use of appropriate gear-ratios and the development of efficient gear change mechanisms.

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“…This suggests that muscle mass recruited for exercise is much greater during horizontal load walking than during a cycle ergometer exercise because pedaling requires fewer muscles (lower extremities). It is well known that the maximal oxygen uptake depends on the muscle mass recruited for exercise [12][13][14][15]. Similarly, some reports showed that 2 @VT during rowing or running was greater than that during a cycle ergometer exercise [7,8].…”

Section: Greatermentioning

confidence: 99%

Oxygen uptake, heart rate, and work rate at ventilatory threshold for treadmill walking against a horizontal impeding force

Azuma¹

2013

Health

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The purpose of this study was to compare the ventilatory threshold (VT) between treadmill walking against a horizontal impeding force (horizontal load walking) and a cycle ergometer exercise. Seven adult men volunteered to participate in this study. They performed horizontal load walking (velocity: 1.11 m/s) and a cycle ergometer exercise (pedaling frequency: 60 rpm), with loads imposed using a ramp slope technique. Oxygen uptake at the VT during horizontal load walking was greater than that during a cycle ergometer exercise (p < 0.05), whereas the opposite was noted for the work rate at VT (p < 0.05). The greater metabolic cost was because of the small output (work rate at VT) incurred during horizontal load walking. This suggested that the muscle mass recruited for exercise would be much greater for horizontal load walking than a cycle ergometer exercise because pedaling requires fewer muscles (lower extremities). In addition, a high reliability of VT during horizontal load walking was indicated from the correlation coefficient, standard error, and the confidence coefficient in two trials for the same subjects, which were 0.97, 0.097 L/min, and 0.96, respectively. These results suggest that horizontal load walking may be a modality for aerobic conditioning.

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Hemodynamic response to work with different muscle groups, sitting and supine.

Cited by 317 publications

References 0 publications

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

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

Aerobic power and peak power of elite America’s Cup sailors

Oxygen uptake, heart rate, and work rate at ventilatory threshold for treadmill walking against a horizontal impeding force

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