The validity of the use of heart rate in estimating oxygen consumption in static and in combined static/dynamic exercise

Abstract

The accuracy of using the HR/VO2 relation determined in running to predict VO2 from HR in tasks involving static and combined static/dynamic exercise was examined in a group of 8 healthy subjects (age 20-27 years). The HR measured in weight-holding tasks (with static exercise) and weight-carrying tasks (with combined static/dynamic exercise) with weights varying from 4-12 kg was inserted into the linear relation between HR and VO2 in the running task (dynamic exercise). The predicted VO2 was compared with measured value. The conclusions were as follows. It is not accurate to use a simple dynamic task to predict VO2 from a measured HR in static work. The percentage differences vary between 78 and 186%. In combined static-dynamic work a simple dynamic task can be accurately used to predict VO2 from measured HR, while carrying small weights (4, 8 and 10 kg). However, more static work (12 kg) makes the estimations poorer with a significant percentage difference in VO2 of 38%.

Use of Heart Rate Recovery Cost as an Index for Measuring Physical Stress

“…Under the same conditions, the increase in held weight, however, had no significant effect on T. Additionally, both RC and V02 present a close trend ranging from about 5% to 20% (with an r value of 0.89, p < 0.00 I). This is somewhat contradictory to previous studies in which static work resulted in total oxygen uptake remaining constant [4,10,14,17]. This may provide information on whether a person's cardiovascular and respiratory system will interact with body movement or coordination in segments when performing the combined static/dynamic component tasks, especially with heavy loads.…”

“…From the literature it is known that the type of physical work and different physical work protocols influence the slope of the linear relation between VOl and HR [3,21,22,27]. For example, it has been detennined that static work can increase HR even though the total oxygen uptake stays constant [10,14,17]. Preference was given by Malchaire and Mallemacq [16] to continuous HR recordings, as they enable one to analyze the cardiovascular strain due to work both at a given time in correlation to the work done and on average over the entire working period.…”

“…This is particularly true of daily activities of carrying and lifting loads. Over the years, ergonomists and occupational safety and health professionals have extensively utilized measurements of energy expenditure [2,8,10], pulmonary ventilation [28], heart rate [17,26]. rate of perceived exertion [15], and systematic blood pressure [I] to determine the physical effort involved in different types of manual work.…”

Flight Modes in Migrating European Bee-Eaters: Heart Rate May Indicate Low Metabolic Rate during Soaring and Gliding

“…In the study of Bevan et al [8], [9], the relationship was based on measurements from birds that did not support weight in flight, but rather walked on a treadmill and thus were exercising their leg muscles. Maas et al [46] reported that f H and were correlated, and that was only slightly higher in humans supporting a static load, with forearms horizontal while holding water-containing Jerrycans weighing 4–10 kg for 10 minutes, than when at rest. When static load support was combined with walking on a treadmill, the relationship increased dramatically, probably because OP changed between these two activities (see also [15]).…”

Pushing and Pulling in Relation to Musculoskeletal Complaints

“…An elevated blood pressure has been reported during tasks with isometric muscle activity 91154 and the HR was found to increase more than the V0 2 m2m . Maas et al 153 found that the HR can be used to predict the V0 2 when carrying weights of maximum 10 kg, more isometric muscle activity resulted in an overestimation of the V0 2 at a given HR. Garcin et al 83 compared the physiological strain of pushing with the hands against a bar and hauling a load using a pelvic belt.…”