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Beltz NM, Amorim FT, Gibson AL, Janot JM, Kravitz L, Mermier CM, Cole N, Moriarty TA, Nunez TP, Trigg S, Dalleck LC. Hemodynamic and metabolic responses to self-paced and ramp-graded exercise testing protocols. Appl Physiol Nutr Metab 2018; 43:609-616. [PMID: 29334615 DOI: 10.1139/apnm-2017-0608] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Recent examinations have shown lower maximal oxygen consumption during traditional ramp (RAMP) compared with self-paced (SPV) graded exercise testing (GXT) attributed to differences in cardiac output. The current study examined the differences in hemodynamic and metabolic responses between RAMP and SPV during treadmill exercise. Sixteen recreationally trained men (aged23.7 ± 3.0 years) completed 2 separate treadmill GXT protocols. SPV consisted of five 2-min stages (10 min total) of increasing speed clamped by the Borg RPE6-20 scale. RAMP increased speed by 0.16 km/h every 15 s until volitional exhaustion. All testing was performed at 3% incline. Oxygen consumption was measured via indirect calorimetry; hemodynamic function was measured via thoracic impedance and blood lactate (BLa-) was measured via portable lactate analyzer. Differences between SPV and RAMP protocols were analyzed as group means by using paired-samples t tests (R Core Team 2017). Maximal values for SPV and RAMP were similar (p > 0.05) for oxygen uptake (47.1 ± 3.4 vs. 47.4 ± 3.4 mL·kg-1·min-1), heart rate (198 ± 5 vs. 200 ± 6 beats·min-1), ventilation (158.8 ± 20.7 vs. 159.3 ± 19.0 L·min-1), cardiac output (26.9 ± 5.5 vs. 27.9 ± 4.2 L·min-1), stroke volume (SV) (145.9 ± 29.2 vs. 149.8 ± 25.3 mL·beat-1), arteriovenous oxygen difference (18.5 ± 3.1 vs. 19.7 ± 3.1 mL·dL-1), ventilatory threshold (VT) (78.2 ± 7.2 vs. 79.0% ± 7.6%), and peak BLa- (11.7 ± 2.3 vs. 11.5 ± 2.4 mmol·L-1), respectively. In conclusion, SPV elicits similar maximal hemodynamic responses in comparison to RAMP; however, SV kinetics exhibited unique characteristics based on protocol. These results support SPV as a feasible GXT protocol to identify useful fitness parameters (maximal oxygen uptake, oxygen uptake kinetics, and VT).
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Affiliation(s)
- Nicholas M Beltz
- a Department of Kinesiology, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USA
| | - Fabiano T Amorim
- b Department of Health, Exercise, and Sports Sciences, University of New Mexico, Albuquerque, NM 87131, USA
| | - Ann L Gibson
- b Department of Health, Exercise, and Sports Sciences, University of New Mexico, Albuquerque, NM 87131, USA
| | - Jeffrey M Janot
- a Department of Kinesiology, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USA
| | - Len Kravitz
- b Department of Health, Exercise, and Sports Sciences, University of New Mexico, Albuquerque, NM 87131, USA
| | - Christine M Mermier
- b Department of Health, Exercise, and Sports Sciences, University of New Mexico, Albuquerque, NM 87131, USA
| | - Nathan Cole
- b Department of Health, Exercise, and Sports Sciences, University of New Mexico, Albuquerque, NM 87131, USA
| | - Terence A Moriarty
- b Department of Health, Exercise, and Sports Sciences, University of New Mexico, Albuquerque, NM 87131, USA
| | - Tony P Nunez
- c Department of Human Performance and Sport, Metropolitan State University of Denver, Denver, CO 80204, USA
| | - Sam Trigg
- b Department of Health, Exercise, and Sports Sciences, University of New Mexico, Albuquerque, NM 87131, USA
| | - Lance C Dalleck
- d Recreation, Exercise & Sports Science Department, Western State Colorado University, Gunnison, CO, USA
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Hutchinson MJ, Paulson TAW, Eston R, Goosey-Tolfrey VL. Assessment of peak oxygen uptake during handcycling: Test-retest reliability and comparison of a ramp-incremented and perceptually-regulated exercise test. PLoS One 2017; 12:e0181008. [PMID: 28704487 PMCID: PMC5509239 DOI: 10.1371/journal.pone.0181008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Accepted: 06/23/2017] [Indexed: 12/04/2022] Open
Abstract
Purpose To examine the reliability of a perceptually-regulated maximal exercise test (PRETmax) to measure peak oxygen uptake ( V˙O2peak) during handcycle exercise and to compare peak responses to those derived from a ramp-incremented protocol (RAMP). Methods Twenty recreationally active individuals (14 male, 6 female) completed four trials across a 2-week period, using a randomised, counterbalanced design. Participants completed two RAMP protocols (20 W·min-1) in week 1, followed by two PRETmax in week 2, or vice versa. The PRETmax comprised five, 2-min stages clamped at Ratings of Perceived Exertion (RPE) 11, 13, 15, 17 and 20. Participants changed power output (PO) as often as required to maintain target RPE. Gas exchange variables (oxygen uptake, carbon dioxide production, minute ventilation), heart rate (HR) and PO were collected throughout. Differentiated RPE were collected at the end of each stage throughout trials. Results For relative V˙O2peak, coefficient of variation (CV) was equal to 4.1% and 4.8%, with ICC(3,1) of 0.92 and 0.85 for repeated measures from PRETmax and RAMP, respectively. Measurement error was 0.15 L·min-1 and 2.11 ml·kg-1·min-1 in PRETmax and 0.16 L·min-1 and 2.29 ml·kg-1·min-1 during RAMP for determining absolute and relative V˙O2peak, respectively. The difference in V˙O2peak between PRETmax and RAMP was tending towards statistical significance (26.2 ± 5.1 versus 24.3 ± 4.0 ml·kg-1·min-1, P = 0.055). The 95% LoA were -1.9 ± 4.1 (-9.9 to 6.2) ml·kg-1·min-1. Conclusion The PRETmax can be used as a reliable test to measure V˙O2peak during handcycle exercise in recreationally active participants. Whilst PRETmax tended towards significantly greater V˙O2peak values than RAMP, the difference is smaller than measurement error of determining V˙O2peak from PRETmax and RAMP.
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Affiliation(s)
- Michael J. Hutchinson
- The Peter Harrison Centre for Disability Sport, School for Sport, Exercise and Health Sciences, Loughborough University, Loughborough, United Kingdom
| | - Thomas A. W. Paulson
- The Peter Harrison Centre for Disability Sport, School for Sport, Exercise and Health Sciences, Loughborough University, Loughborough, United Kingdom
| | - Roger Eston
- Alliance for Research in Exercise, Nutrition and Activity, Sansom Institute for Health Research, School of Health Sciences, University of South Australia, Adelaide, Australia
| | - Victoria L. Goosey-Tolfrey
- The Peter Harrison Centre for Disability Sport, School for Sport, Exercise and Health Sciences, Loughborough University, Loughborough, United Kingdom
- * E-mail:
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