scholarly journals Cross-validation of Peak Oxygen Consumption Prediction Models From OMNI Perceived Exertion

2016 ◽  
Vol 37 (10) ◽  
pp. 831-837
Author(s):  
R. Mays ◽  
F. Goss ◽  
E. Nagle ◽  
M. Gallagher ◽  
L. Haile ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Perceived Exertion ◽  
Cross Validation ◽  
Prediction Models ◽  
Peak Oxygen Consumption ◽  
Consumption Prediction

Performance Effects of Carbohydrate Ingestion Between Bouts of Intense Aerobic Interval Exercise

2020 ◽  
Vol 15 (2) ◽  
pp. 262-267
Author(s):  
Devin G. McCarthy ◽  
Lawrence L. Spriet
Keyword(s):  
Oxygen Consumption ◽  
Perceived Exertion ◽  
Peak Oxygen Consumption ◽  
Trial Duration ◽  
Carbohydrate Ingestion ◽  
Subsequent Performance ◽  
Performance Effects ◽  
Improved Performance ◽  
Post Hoc ◽  
Glycogen Stores

Background: Rest between training sessions can be short for athletes. In these situations, consuming carbohydrate (CHO) postexercise replenishes glycogen stores, which is important for recovery and subsequent performance. Purpose: This study tested whether CHO intake during a 2-hour rest between exercise bouts improved performance in the subsequent bout. Methods: In a randomized, single-blinded, crossover design, 10 recreationally active participants (23 [4] y, 70.8 [6.6] kg, 47.0 [5.4] mL·O2·min−1·kg·body·mass−1) arrived at the lab postprandial and completed 2 exercise bouts separated by a 2-hour rest. Bouts included 5 × 4-minute intervals at ∼80% peak oxygen consumption separated by 2 minutes at ∼40% peak oxygen consumption and ended with an endurance trial to voluntary exhaustion at ∼90% peak oxygen consumption. During intervals 1 and 4 in each bout, expired gases were collected and O2 deficit was estimated. Immediately following bout 1, either a CHO (1.2 g CHO·kg·body·mass−1) or placebo solution was consumed. Results: Endurance trial duration decreased in bout 2 versus 1 in both conditions (P < .01) but was ∼35% longer in bout 2 with CHO versus placebo (interaction, P = .03; post hoc, P = .03). Oxygen uptake increased during interval 4 versus 1 in both bouts (P < .01) but was unaffected by CHO (P ≥ .58). O2 deficit was unaffected by CHO (P = .93), bout, or interval (P ≥ .15). Perceived exertion was higher in bout 2 versus 1 (P < .001) and reduced in intervals 2 and 4 in CHO (P ≤ .01). Conclusions: When rest between training sessions is 2 hours, athletes may improve subsequent performance by consuming CHO during recovery.

Effect of ENDUROX™ on Metabolic Responses to Submaximal Exercise

1999 ◽  
Vol 9 (4) ◽  
pp. 434-442 ◽  
Author(s):  
Samuel N. Cheuvront ◽  
Robert J. Moffatt ◽  
Kyle D. Biggerstaff ◽  
Shawn Bearden ◽  
Paul McDonough
Keyword(s):  
Oxygen Consumption ◽  
Repeated Measures ◽  
Perceived Exertion ◽  
Minute Ventilation ◽  
Rating Of Perceived Exertion ◽  
Peak Oxygen Consumption ◽  
Metabolic Responses ◽  
Double Blind ◽  
Serum Glycerol ◽  
Male Subjects

Claims that ENDUROX™ enhances performance by altering metabolic responses to exercise were tested. In a double-blind crossover design, 10 male subjects were randomly assigned to consume 400 mg of placebo or 800 mg ENDUROX™ for 7 days. Cycle ergometry was performed for 30 minutes at 25%, followed by 10 min at 65% of peak oxygen consumption. After a 1-week washout period, subjects performed the identical exercise protocol following 7 days of reciprocal supplemental conditions. Expired gases were collected and analyzed continuously for oxygen consumption, minute ventilation, and respiratory exchange ratio. Heart rate, blood pressure, rating of perceived exertion, blood lactate, and serum glycerol data were also collected at regular intervals. A two-way ANOVA with repeated measures revealed no significant main or interaction effects involving group differences (p > 0.05) between trials for any variable during rest, 25% or 65% (VO2 peak), or recovery. Our findings do not support the ergogenic claims for ENDUROX™.

scholarly journals Cardiorespiratory demand of acute voluntary cycling with functional electrical stimulation in individuals with multiple sclerosis with severe mobility impairment

2018 ◽  
Vol 43 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Thomas Edwards ◽  
Robert W. Motl ◽  
Lara A. Pilutti
Keyword(s):  
Multiple Sclerosis ◽  
Oxygen Consumption ◽  
Electrical Stimulation ◽  
Functional Electrical Stimulation ◽  
Perceived Exertion ◽  
Peak Oxygen Consumption ◽  
Mobility Impairment ◽  
Acute Response ◽  
Cardiorespiratory Response ◽  
Leg Cycling

Exercise training is one strategy for improving cardiorespiratory fitness (CRF) in multiple sclerosis (MS); however, few modalities are accessible for those with severe mobility impairment. Functional electrical stimulation (FES) cycling is an adapted exercise modality with the potential for improving CRF in people with severe MS. The objective of this study was to characterize the cardiorespiratory response of acute voluntary cycling with FES in people with MS with severe mobility impairment, and to compare this response to passive leg cycling. Eleven participants with MS that required assistance for ambulation completed a single bout of voluntary cycling with FES or passive leg cycling. Oxygen consumption, heart rate (HR), work rate (WR), and ratings of perceived exertion (RPE) were recorded throughout the session. For the FES group, mean exercising oxygen consumption was 8.7 ± 1.8 mL/(kg·min)−1, or 63.5% of peak oxygen consumption. Mean HR was 102 ± 9.7 bpm, approximately 76.4% of peak HR. Mean WR was 27.0 ± 9.2 W, or 57.3% of peak WR, and median RPE was 13.5 (interquartile range = 5.5). Active cycling with FES was significantly (p < 0.05) more intense than passive leg cycling based on oxygen consumption, HR, WR, and RPE during exercise. In conclusion, voluntary cycling with FES elicited an acute response that corresponded with moderate-to vigorous-intensity activity, suggesting that active cycling with FES can elicit a sufficient stimulus for improving CRF.

Oxygen consumption prediction models for individual and combination materials handling tasks

Ergonomics ◽  
2008 ◽  
Vol 51 (11) ◽  
pp. 1776-1789 ◽  
Author(s):  
Patrick G. Dempsey ◽  
Vincent M. Ciriello ◽  
Rammohan V. Maikala ◽  
Niall V. O'Brien
Keyword(s):  
Oxygen Consumption ◽  
Prediction Models ◽  
Materials Handling ◽  
Consumption Prediction

Does blood lactate predict the chronic adaptive response to training: A comparison of traditional and talk test prescription methods

2019 ◽  
Vol 44 (2) ◽  
pp. 179-186 ◽  
Author(s):  
Nicholas Preobrazenski ◽  
Jacob T. Bonafiglia ◽  
Matthew W. Nelms ◽  
Simo Lu ◽  
Lauren Robins ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Exercise Training ◽  
Blood Lactate ◽  
Perceived Exertion ◽  
Training Session ◽  
Work Rate ◽  
Small Sample ◽  
Rating Of Perceived Exertion ◽  
Peak Oxygen Consumption ◽  
Control Group

The purpose of this study was to test the hypotheses (i) that interindividual variability in acute blood lactate responses during exercise at 65% of peak work rate (WRpeak; relative WRpeak protocol (REL)) will predict variability in the chronic responses to exercise training and (ii) that exercising at an intensity that causes uncomfortable speech production (negative talk test (TT) stage (NEG)) elicits high acute blood lactate responses and large adaptations to training. Twenty-eight participants completed 4 weeks of exercise training consisting of REL (n = 14) or NEG (TT, n = 14). Fifteen additional participants were assigned to a no-exercise control group (n = 15). In REL, acute blood lactate responses during the first training session significantly predicted changes in peak oxygen consumption (r = 0.69) after training. TT resulted in consistently high acute blood lactate responses. REL and TT improved (p < 0.05) peak oxygen consumption, WRpeak, and work rate at the onset of blood lactate accumulation (WROBLA). Despite nonsignificance, small to medium between-group effect sizes for changes in peak oxygen consumption, WRpeak, and WROBLA and a higher work rate, heart rate, rating of perceived exertion, and blood lactate during training at NEG support the potential superiority of TT over REL. When exercise is prescribed using a traditional method (a fixed percentage of WRpeak; REL), acute metabolic stress may partly explain the variance in the adaptations to training. In addition, TT elicited significant increases in peak oxygen consumption, WRpeak, and WROBLA, and although our small sample size limits our ability to confidently compare training adaptations between groups, our preliminary results suggest that future investigations with larger sample sizes should assess the potential superiority of TT over REL.

Wheelchair propulsion: effects of experience and push strategy on efficiency and perceived exertion

2008 ◽  
Vol 33 (5) ◽  
pp. 870-879 ◽  
Author(s):  
John P. Lenton ◽  
Neil E. Fowler ◽  
Lucas van der Woude ◽  
Victoria L. Goosey-Tolfrey
Keyword(s):  
Oxygen Consumption ◽  
Perceived Exertion ◽  
Maximal Exercise ◽  
Metabolic Cost ◽  
Peak Oxygen Consumption ◽  
Wheelchair Propulsion ◽  
Physiological Measures ◽  
Frequency Data ◽  
Ratings Of Perceived Exertion

The purpose of this study was to examine the role of wheeling experience on efficiency, metabolic cost, and differentiated ratings of perceived exertion (RPEs) during synchronous and asynchronous hand-rim propulsion with varying arm frequencies. Fourteen able-bodied (AB) male participants and 8 male wheelchair sportsmen (WS) performed tests of peak oxygen consumption for both propulsion modes. Subsequently, 2 series of five 4-min sub-maximal exercise bouts were completed at an individualized velocity (60% of peak oxygen consumption). Arm frequencies consisted of the freely chosen frequency (FCF), followed by 4 counter-balanced paced trials pushing at 60%, 80%, 120%, and 140% of the FCF. Efficiency indices (gross, GE; work, WE) were determined and peripheral (RPE-P), central (RPE-C), and overall (RPE-O) RPEs were recorded. The GE (6.4% vs. 8.4%) and WE (11.3% vs. 15.1%) were significantly higher in WS than in AB (p = 0.001). Trends in the oxygen consumption, GE, and WE data were similar in both groups, propulsion mode, and arm frequency. Data suggest that 80% FCF resulted in improved efficiency for both propulsion mode and group, although the differences between those arm frequencies immediately above and below were non-significant. Lower RPE scores corresponded with higher efficiency values. Regardless of group there were significant differences (p = 0.001) between the differentiated RPE measures, whereby RPE-P was on average always the highest score (13.1) and RPE-C the lowest (11.1; RPE-O was 12.2). In conclusion, despite the anticipated differences in efficiency between the WS and AB participants, this study confirmed that psycho-physiological measures produce similar trends to physiological measures with manipulations of both arm frequency and propulsion mode.

scholarly journals The Effect of Metformin on Self-Selected Exercise Intensity in Healthy, Lean Males: A Randomized, Crossover, Counterbalanced Trial

2021 ◽  
Vol 12 ◽  
Author(s):  
Nanna Skytt Pilmark ◽  
Christina Petersen-Bønding ◽  
Nielse Frederich Rose Holm ◽  
Mette Yun Johansen ◽  
Bente Klarlund Pedersen ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Exercise Intensity ◽  
Oxygen Consumption Rate ◽  
Perceived Exertion ◽  
Consumption Rate ◽  
Exercise Bout ◽  
Peak Oxygen Consumption ◽  
Treatment Dose ◽  
Healthy Males

IntroductionIn general, patients with type 2 diabetes have lower cardiorespiratory fitness levels and perform exercise at lower intensities compared to healthy controls. Since metformin (MET) has been shown to increase the rate of perceived exertion (RPE) during exercise with a fixed intensity, MET per se may reduce self-selected exercise intensity. The aim of this study was to assess the effect of MET on self-selected exercise intensity.MethodsHealthy males were eligible for this crossover, counterbalanced study with two treatment periods: MET and placebo (PLA), each lasting 17 days. Treatment dose was gradually increased and reached 2 g/day on treatment day 9, and continued at that level for the rest of the treatment period. The two periods were performed in randomized order. Two experimental days (A+B) were conducted on Day 15 (A) and Day 17 (B) of each period, respectively. Day A consisted of an exercise bout with self-selected exercise intensity (equal to RPE = 14–15 on the Borg Scale). Day B consisted of an exercise bout with fixed intensity (70% of VO2peak). Oxygen consumption rate was assessed continuously during both exercise bouts.ResultsFifteen males (age 23.7 ± 0.6 years, BMI 22.3 ± 2.0, VO2peak 3.5 ± 0.6 L/min) were included in the study. On Day B, RPE was higher in MET compared to PLA (14.8 ± 0.4 vs. 14.0 ± 0.3, P = 0.045). On Day A, no difference in self-selected exercise intensity measured by oxygen consumption rate (PLA 2.33 ± 0.09 L O2/min, MET 2.42 ± 0.10 L O2/min, P = 0.09) was seen between treatment periods.ConclusionsSelf-selected exercise intensity was not reduced by MET in healthy males, despite the fact that MET increased RPE during an exercise bout with fixed intensity.

Interactions of sprint interval exercise and psychological need-support on subsequent food intake among physically inactive men and women

2020 ◽  
Vol 45 (8) ◽  
pp. 835-844
Author(s):  
Natalya J. Beer ◽  
James A. Dimmock ◽  
Ben Jackson ◽  
Kym J. Guelfi
Keyword(s):  
Oxygen Consumption ◽  
Energy Intake ◽  
Perceived Exertion ◽  
Peak Oxygen Consumption ◽  
Moderate Intensity ◽  
Continuous Training ◽  
Men And Women ◽  
Psychological Need ◽  
Need Support ◽  
Physically Inactive

The aim of this study was to investigate the effect of sprint interval training (SIT) and psychological need-support in exercise on postexercise appetite and energy intake. Forty physically inactive men and women (body mass index, 24.6 ± 4.8 kg·m−2; peak oxygen consumption, 26.6 ± 4.9 mL·kg−1·min−1) were randomised to either a need-support or no-support condition, with each participant completing 2 experimental trials involving 30 min of moderate-intensity continuous training (MICT; 60% peak oxygen consumption) and SIT (alternating 15 s at 170% peak oxygen consumption and 60 s at 32% peak oxygen consumption) matched for total work. Perceptions of appetite and appetite-related blood variables were assessed, together with ad libitum energy intake for 3 h following exercise using a laboratory test meal and available snacks. Greater enjoyment, perceived exertion, heart rate, and blood lactate were observed in SIT compared with MICT (all p ≤ 0.006). Ratings of perceived appetite were similar across conditions and trials (p > 0.05); however, active ghrelin was lower following SIT compared with MICT (p < 0.001), and there was a significant condition-by-type interaction for energy intake (p = 0.033), with participants in the support group consuming less energy from foods following SIT (1895 ± 1040 kJ) than MICT (2475 ± 1192 kJ). Findings from this work highlight the need to reconsider traditional exercise guidelines where dietary intake is a concern. Novelty Enjoyment was greater during SIT compared with MICT. Enjoyment and choice were higher among participants provided with psychological need-support. In a need-supportive environment, SIT reduced subsequent energy intake compared with MICT.

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