Influence of limb length on a stepping exercise

1978 ◽  
Vol 44 (3) ◽  
pp. 346-349 ◽  
Author(s):  
H. Shahnawaz
Keyword(s):  
Oxygen Consumption ◽  
Work Load ◽  
Limb Length ◽  
Step Test ◽  
Standard Work ◽  
Bench Height ◽  
Consumption Values ◽  
Test Exercise ◽  
Stepping Exercise

The effect of limb length on responses to the step-test exercise was studied in 10 subjects of various heights; oxygen consumption values served as an indicator. Mean oxygen consumption was found to be significantly related to limb length in the step-test exercise. This was demonstrated when subjects with different limb lengths were tested as a standard work load (i.e., 10 m/min x body wt) but at seven different bench heights and correspondingly adjusted stepping rates. The minimum values for oxygen consumption were obtained when the bench height was near 50% (45–55%) of subject's limb length.

Validity of the Step Test for Exercise Prescription: No Extension to a Larger Age Range

2013 ◽  
Vol 21 (4) ◽  
pp. 444-454 ◽  
Author(s):  
Eric D. Vidoni ◽  
Anna Mattlage ◽  
Jonathan Mahnken ◽  
Jeffrey M. Burns ◽  
Joe McDonough ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Exercise Testing ◽  
Maximal Exercise ◽  
Exercise Prescription ◽  
Submaximal Exercise ◽  
Step Test ◽  
Peak Oxygen Consumption ◽  
Submaximal Exercise Test ◽  
Test Exercise ◽  
Age Range

The purpose of this study was to determine the validity of a submaximal exercise test, the Step Test Exercise Prescription (STEP), in a broad age range and in individuals in the earliest stages of Alzheimer’s disease (AD). Individuals (n = 102) underwent treadmill-based maximal exercise testing and a STEP. The STEP failed to predict peak oxygen consumption (VO2peak), and was a biased estimate of VO2peak (p < .0001). Only 43% of subjects’ STEP results were within 3.5 ml · kg–1 · min–1 of VO2peak. When categorized into fitness levels these 2 measures demonstrated moderate agreement (kappa = .59). The validity of the STEP was not supported in our participants, including those with AD. The STEP may not be appropriate in the clinic as a basis for exercise recommendations in these groups, although it may continue to have utility in classifying fitness in research or community health screenings.

Metabolic rates of freely diving Weddell seals: correlations with oxygen stores, swim velocity and diving duration

1992 ◽  
Vol 165 (1) ◽  
pp. 181-194 ◽  
Author(s):  
M. A. Castellini ◽  
G. L. Kooyman ◽  
P. J. Ponganis
Keyword(s):  
Oxygen Consumption ◽  
Dive Duration ◽  
Metabolic Rates ◽  
Theoretical Limit ◽  
Weddell Seals ◽  
Consumption Values ◽  
Aerobic Dive Limit ◽  
Significant Difference ◽  
On Line ◽  
The Cost

The metabolic rates of freely diving Weddell seals were measured using modern methods of on-line computer analysis coupled to oxygen consumption instrumentation. Oxygen consumption values were collected during sleep, resting periods while awake and during diving periods with the seals breathing at the surface of the water in an experimental sea-ice hole in Antarctica. Oxygen consumption during diving was not elevated over resting values but was statistically about 1.5 times greater than sleeping values. The metabolic rate of diving declined with increasing dive duration, but there was no significant difference between resting rates and rates in dives lasting up to 82 min. Swimming speed, measured with a microprocessor velocity recorder, was constant in each animal. Calculations of the aerobic dive limit of these seals were made from the oxygen consumption values and demonstrated that most dives were within this theoretical limit. The results indicate that the cost of diving is remarkably low in Weddell seals relative to other diving mammals and birds.

Respiratory and cerebral circulatory control during exercise at .21 and 2.0 atmospheres inspired pO2

1959 ◽  
Vol 14 (6) ◽  
pp. 966-982 ◽  
Author(s):  
Christian J. Lambertsen ◽  
S. G. Owen ◽  
Herbert Wendel ◽  
Morris W. Stroud ◽  
Abraham A. Lurie ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Venous Blood ◽  
Work Load ◽  
Minute Volume ◽  
Bicarbonate Concentration ◽  
Oxygen Administration ◽  
Circulatory Control ◽  
Leg Exercise ◽  
Positive Correlations ◽  
Fixed Acid

Respiratory and cerebral hemodynamic responses to leg exercise during respiration of air at 1.0 atm. and O2 at 2.0 atm. were studied in relation to changes in arterial and internal jugular venous blood oxygen composition, pH, pCO2 and bicarbonate concentration. The hyperpnea of exercise at 1.0 atm. was accompanied by arterial and venous acidemia and hypocapnia. Oxygen administration during exercise at 2.0 atm. lowered ventilation, restored arterial pH and pCO2 toward resting levels and caused venous pCO2 to rise above the resting level; cerebral venous cH remained elevated in spite of reduction of blood fixed acid concentration. The ventilatory response to exercise showed positive correlations with work load, oxygen consumption, and with changes in arterial and internal jugular venous cH and fixed acid. The observed negative correlations of changes in respiratory minute volume with changes in arterial and internal jugular venous pCO2 and bicarbonate concentration suggest that these factors are functions, rather than primary determinants, of ventilation in exercise. Cerebral hemodynamics and oxygen consumption were not significantly altered by exercise at 1.0 atm. The data suggest either a slight elevation of cerebral blood flow or reduction in the rate of cerebral oxygen consumption during exercise breathing O2 at 2.0 atm., without gross elevation of cerebral venous pO2. Observed changes in cerebral vascular resistance during exercise at .21 and 2.0 atm. inspired pO2 appear related to concomitant alterations in arterial pCO2, with no detectable relationship either to brain oxygen requirement of cerebral venous acid-base composition. Submitted on November 25, 1958

scholarly journals Step Test: a method for evaluating maximum oxygen consumption to determine the ability kind of work among students of medical emergencies

10.19082/4020 ◽  
2017 ◽  
Vol 9 (03) ◽  
pp. 4020-4026 ◽  
Author(s):  
Payam Heydari ◽  
Sakineh Varmazyar ◽  
Ahmad Nikpey ◽  
Ali Safari Variani ◽  
Mojtaba Jafarvand
Keyword(s):  
Oxygen Consumption ◽  
Step Test ◽  
Maximum Oxygen Consumption ◽  
Medical Emergencies
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