Physical Training in Sedentary Middle-aged and Older Men II. Oxygen Uptake, Heart Rate, and Blood Lactate Concentration at Submaximal and Maximal Exercise

1. The effects of correcting anaemia on exercise capacity were evaluated in 21 haemodialysis patients (aged 39 ± 12 years) before starting treatment with recombinant human erythropoietin (Hb concentration, 73 ± 10 g/l; total Hb, 59 ± 12% of expected), after correction of the anaemia to a Hb concentration of 108 ± 7 g/l and a total Hb 82 ± 10% of expected, and in 13 of the patients after 12 months on maintenance recombinant human erythropoietin treatment (Hb concentration 104 ± 14 g/l, total Hb 79 ± 17% of expected). Fifteen healthy subjects (aged 41 ± 9 years), who took no regular exercise, constituted the control group. Maximal exercise capacity was determined on a bicycle ergometer. Oxygen uptake, respiratory quotient, blood lactate concentration, heart rate and blood pressure were measured at rest and at maximal workload. 2. After 6 ± 3 months on recombinant human erythropoietin, maximal exercise capacity increased from 108 ± 27 W to 130 ± 36 W (P < 0.001) and the maximal oxygen uptake increased from 1.24 ± 0.39 litres/min to 1.50 ± 0.45 litres/min (P < 0.001). No significant changes in respiratory quotient (1.16 ± 0.13 versus 1.18 ± 0.13) and blood lactate concentration (4.0 ± 1.8 versus 3.6 ± 1.1 mmol/l) at maximal workload were observed, but the blood lactate concentration in the patients was significantly lower than that in the control subjects (6.7 ± 2.3 mmol/l, P < 0.01). After the correction of anaemia, the aerobic power was still 38% lower in the patients than in the control subjects and 17% lower than the reference values. 3. After 12 months on maintenance recombinant human erythropoietin treatment (17 ± 3 months from the start of the study), no further significant changes were observed in maximal exercise capacity (before start, 112 ± 31 W, 6 ± 3 months, 134 ± 42 W, 17 ± 3 months, 134 ± 50 W), maximal oxygen uptake (before start, 1.33 ± 0.45 litres/min; 6 ± 3 months, 1.59 ± 0.54 litres/min; 17 ± 3 months, 1.75 ± 0.78 litres/min) or blood lactate concentration (before start, 4.4 ± 1.9 mmol/l; 6 ± 3 months, 4.0 ± 1.0 mmol/l; 17 ± 3 months, 4.7 ± 2.0 mmol/l). 4. Thus, in haemodialysis patients the improvement in maximal aerobic power after the correction of anaemia persists without marked changes during long-term treatment with recombinant human erythropoietin. We did not observe any effects on exercise capacity that could be attributed to a spontaneous increase in physical activity after treatment of anaemia.

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Temporal sequence of recovery-related events following maximal exercise assessed by heart rate variability and blood lactate concentration

Clinical Physiology and Functional Imaging ◽

10.1111/cpf.12339 ◽

2016 ◽

Vol 37 (5) ◽

pp. 536-543 ◽

Cited By ~ 9

Author(s):

Rosangela Akemi Hoshi ◽

Luiz Carlos Marques Vanderlei ◽

Moacir Fernandes de Godoy ◽

Fábio do Nascimento Bastos ◽

Jayme Netto ◽

...

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Blood Lactate ◽

Maximal Exercise ◽

Lactate Concentration ◽

Blood Lactate Concentration ◽

Temporal Sequence

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Comparison of perceptual and physiological variables of running on a track, motorized treadmill, and non-motorized curved treadmill at increasing velocity

Acta Kinesiologiae Universitatis Tartuensis ◽

10.12697/akut.2016.22.02 ◽

2016 ◽

Vol 22 ◽

pp. 20 ◽

Cited By ~ 3

Author(s):

Veronika Myran Wee ◽

Erna Von Heimburg ◽

Roland Van den Tillaar

Keyword(s):

Heart Rate ◽

Oxygen Uptake ◽

Blood Lactate ◽

Perceived Exertion ◽

Lactate Concentration ◽

Blood Lactate Concentration ◽

Treadmill Running ◽

Male Athletes ◽

Physiological Variables ◽

The Difference

The aim of this study was to compare perceptual and physiological variables between running on three different modalities — an indoor athletics track, a motorized treadmill, and a non-motorized curved treadmill — for 1000 m at three different velocities. Ten male athletes (age 24±3 years, body mass 69.8±6.91 kg, height 1.80±0.06 m, VO2peak 69.0±6.70 ml/kg/ min) conducted three 1000 m laps at increasing velocity on three different running modalities. The athletes had a 3-minute recovery between each lap, where the rate of perceived exertion (RPE) was registered and the blood lactate concentration and heart rate were measured. Oxygen uptake was measured using a portable metabolic analyser. The physiological (oxygen uptake, heart rate, and blood lactate concentration) and perceptual (RPE) variables were higher when running on a non-motorized curved treadmill compared with running on the track or a motorized treadmill. No differences were found between running on a motorized treadmill and the track except for the RPE, which was lower when running on the track compared with the motorized treadmill. Running on a non-motorized curved treadmill at three different velocities results in a higher oxygen uptake (37%) and heart rate (22%) and is subjectively much harder than running on a track or a motorized treadmill at the same velocities. The difference is around 4 km/h when comparing the physiological and perceptual responses. Thus, when performing training sessions on a non-motorized curved treadmill, subjects should subtract 4 km/h from their regular pace on a track or motorized treadmill to get the same response considering oxygen uptake, heart rate, RPE and blood lactate concentration.

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Exercise recovery above and below anaerobic threshold following maximal work

Journal of Applied Physiology ◽

10.1152/jappl.1981.51.4.840 ◽

1981 ◽

Vol 51 (4) ◽

pp. 840-844 ◽

Cited By ~ 41

Author(s):

B. A. Stamford ◽

A. Weltman ◽

R. Moffatt ◽

S. Sady

Keyword(s):

Blood Lactate ◽

Anaerobic Threshold ◽

Maximal Exercise ◽

Lactate Concentration ◽

Blood Lactate Concentration ◽

Base Line ◽

Exercise Recovery ◽

O2 Uptake ◽

Vo2 Max ◽

Individual Subject

The purpose of this study was to determine the effects of resting and exercise recovery above [70% of maximum O2 uptake (VO2 max)] and below [40% of VO2 max] anaerobic threshold (AT) on blood lactate disappearance following maximal exercise. Blood lactate concentrations at rest (0.9 mM) and during exercise at 40% (1.3 mM) and 70% (3.5 mM) of VO2 max without preceding maximal exercise were determined on separate occasions and represented base lines for each condition. The rate of blood lactate disappearance from peak values was ascertained from single-component exponential curves fit for each individual subject for each condition using both the determined and resting base lines. When determined base lines were utilized, there were no significant differences in curve parameters between the 40 and 70% of VO2 max recoveries, and both were significantly different from the resting recovery. When a resting base line (0.9 mM) was utilized for all conditions, 40% of VO2 max demonstrated a significantly faster half time than either 70% of VO2 max or resting recovery. No differences were found between 70% of VO2 max and resting recovery. It was concluded that interpretation of the effectiveness of exercise recovery above and below AT with respect to blood lactate disappearance is influenced by the base-line blood lactate concentration utilized in the calculation of exponential half times.

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Energetics and Mechanics of Steep Treadmill Versus Overground Pole Walking: A Pilot Study

International Journal of Sports Physiology and Performance ◽

10.1123/ijspp.2021-0252 ◽

2021 ◽

pp. 1-4

Author(s):

Nicola Giovanelli ◽

Lara Mari ◽

Asia Patini ◽

Stefano Lazzer

Keyword(s):

Heart Rate ◽

Oxygen Uptake ◽

Vertical Velocity ◽

Perceived Exertion ◽

Lactate Concentration ◽

Blood Lactate Concentration ◽

Average Intensity ◽

Rate Of Perceived Exertion ◽

Spatiotemporal Parameters ◽

Pole Walking

Purpose: To compare energetics and spatiotemporal parameters of steep uphill pole walking on a treadmill and overground. Methods: First, the authors evaluated 6 male trail runners during an incremental graded test on a treadmill. Then, they performed a maximal overground test with poles and an overground test at 80% (OG80) of vertical velocity of maximal overground test with poles on an uphill mountain path (length = 1.3 km, elevation gain = 433 m). Finally, they covered the same elevation gain using poles on a customized treadmill at the average vertical velocity of the OG80. During all the tests, the authors measured oxygen uptake, carbon dioxide production, heart rate, blood lactate concentration, and rate of perceived exertion. Results: Treadmills required lower metabolic power (15.3 [1.9] vs 16.6 [2.0] W/kg, P = .002) and vertical cost of transport (49.6 [2.7] vs 53.7 [2.1] J/kg·m, P < .001) compared with OG80. Also, oxygen uptake was lower on a treadmill (41.7 [5.0] vs 46.2 [5.0] mL/kg·min, P = .001). Conversely, respiratory quotient was higher on TR80 compared with OG80 (0.98 [0.02] vs 0.89 [0.04], P = .032). In addition, rate of perceived exertion was higher on a treadmill and increased with elevation (P < .001). The authors did not detect any differences in other physiological measurements or in spatiotemporal parameters. Conclusions: Researchers, coaches, and athletes should be aware that steep treadmill pole walking requires lower energy consumption but same heart rate and rate of perceived exertion than overground pole walking at the same average intensity.

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Effects of a 2-km Swim on Markers of Cycling Performance in Elite Age-Group Triathletes

Sports ◽

10.3390/sports7040082 ◽

2019 ◽

Vol 7 (4) ◽

pp. 82

Author(s):

Jeffrey Rothschild ◽

George H. Crocker

Keyword(s):

Heart Rate ◽

Oxygen Consumption ◽

Blood Lactate ◽

Peak Power ◽

Maximal Oxygen Consumption ◽

Lactate Concentration ◽

Blood Lactate Concentration ◽

Cycling Performance ◽

Age Group

The purpose of this study was to examine the effects of a 2-km swim on markers of subsequent cycling performance in well-trained, age-group triathletes. Fifteen participants (10 males, five females, 38.3 ± 8.4 years) performed two progressive cycling tests between two and ten days apart, one of which was immediately following a 2-km swim (33.7 ± 4.1 min). Cycling power at 4-mM blood lactate concentration decreased after swimming by an average of 3.8% (p = 0.03, 95% CI −7.7, 0.2%), while heart rate during submaximal cycling (220 W for males, 150 W for females) increased by an average of 4.0% (p = 0.02, 95% CI 1.7, 9.7%), compared to cycling without prior swimming. Maximal oxygen consumption decreased by an average of 4.0% (p = 0.01, 95% CI −6.5, −1.4%), and peak power decreased by an average of 4.5% (p < 0.01, 95% CI −7.3, −2.3%) after swimming, compared to cycling without prior swimming. Results from this study suggest that markers of submaximal and maximal cycling are impaired following a 2-km swim.

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Aerobic work capacity in middle-aged Norwegian men

Journal of Applied Physiology ◽

10.1152/jappl.1965.20.3.432 ◽

1965 ◽

Vol 20 (3) ◽

pp. 432-436 ◽

Cited By ~ 30

Author(s):

K. Lange Andersen ◽

Lars Hermansen

Keyword(s):

Heart Rate ◽

Oxygen Uptake ◽

Age Groups ◽

Older Men ◽

Work Capacity ◽

Maximal Heart Rate ◽

Middle Aged ◽

Younger Age ◽

Exercise Induced ◽

Aerobic Work Capacity

Maximal oxygen uptake and related respiratory and circulatory functions were measured in sedentary and well-trained middle-aged men. Maximal oxygen uptakes averaged 2.63 liter/min in sedentary men and 3.36 liter/min in well-trained men, the latter value being essentially the same as found in young untrained students. The heart rate/ oxygen uptake relationship was found to be the same for sedentary-living men, regardless of age, but maximal heart rate was lower in older men. The maximal heart rate is probably the same in well-trained as in sedentary middle-aged men, this in contrast to what has been observed in younger age groups, where training reduces maximal heart rate. The exercise-induced hyperventilation takes place at an oxygen uptake corresponding to 70–80% of the capacity, this being the same in trained and untrained, and essentially the same as found in young adult subjects. maximal O2 uptake Submitted on March 23, 1964

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