Evidence map›Paper›PMID 20931221›Full record

Trial reportEuropean journal of applied physiology2011

Are the parameters of VO2, heart rate and muscle deoxygenation kinetics affected by serial moderate-intensity exercise transitions in a single day?

Matthew D Spencer, Juan M Murias, Heather P Lamb, John M Kowalchuk, Donald H Paterson

Abstract readRandomized Controlled Trial
PubMed Publisher
In one paragraph

Trial report in European journal of applied physiology, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 29 papers.

0numbers the graph read from it
0cells of the map it votes in
29citing papers in PubMed
11.6field-weighted citation impact, top 2% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

29 citing papers in PubMed, 65 citations in OpenAlex.

  1. Trial
  2. Exercise training-induced speeding ofEuropean journal of applied physiology · 2025
    Trial
  3. Aerobic capacity andEuropean journal of applied physiology · 2023
    Trial
  4. Cocoa-flavanols enhance moderate-intensity pulmonaryEuropean journal of applied physiology · 2021
    Trial
  5. Trial
  6. Muscle O2 extraction reserve during intense cycling is site-specific.Journal of applied physiology (Bethesda, Md. : 1985) · 2014
    Trial
  7. Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. Association betweenEuropean journal of applied physiology · 2021
    Article
  13. Article
  14. Article
  15. Article
  16. Article
  17. Article
  18. Fitness Level and Not AgingFrontiers in physiology · 2018
    Article
  19. Similar pattern of change in V̇oAmerican journal of physiology. Regulatory, integrative and comparative physiology · 2017
    Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 1 institution in 1 country.

Matthew D SpencerCanadian Centre for Activity and Aging, The University of Western Ontario, London, Canada.
Juan M Murias
Heather P Lamb
John M Kowalchuk
Donald H Paterson
Western University · CA

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

This study compared the parameter estimates of pulmonary oxygen uptake (VO(2p)), heart rate (HR) and muscle deoxygenation (Δ[HHb]) kinetics when several moderate-intensity exercise transitions (MODs) were performed during a single visit versus several MODs performed during separate visits. Nine subjects (24 ± 5 years, mean ± SD) each completed two successive cycling MODs on six occasions (1-6A and 1-6B) from 20 W to a work rate corresponding to 80% estimated lactate threshold with 6 min recovery at 20 W. During one visit, subjects completed two series of three MODs (6A-F), separated by 20 min rest. VO(2p) time constants (τVO(2p); 27 ± 10 s, 25 ± 12 s, 25 ± 11 s) were similar (p > 0.05) for MODs 1-6A, 1-6B and 6A-F, respectively. τVO(2p) had reproducibility 95% confidence intervals (CI(95)) of 8.3, 8.2, 4.7, 4.9 and 4.7 s when comparing single (1A vs. 2A), the average of two (1-2A vs. 3-4A), three (1-3A vs. 4-6A), four (1-2AB vs. 3-4AB) and six (1-3AB vs. 4-6AB) MODs, respectively. The effective Δ[HHb] response time (τ'Δ[HHb]) was unaffected across conditions (1-6A: 19 ± 2 s, 1-6B: 19 ± 3 s, 6A-F: 17 ± 4 s) with reproducibility CI(95) of 5.3, 4.5, 3.1, 2.9 and 3.3 s when a single, two, three, four and six MODs were compared, respectively. τHR was reduced in MODs 6A-F compared to 1-6A and 1-6B (23 ± 5 s, 25 ± 5 s, 27 ± 6 s, respectively). This study showed that parameter estimates of VO(2p), HR and Δ[HHb] kinetics are largely unaffected by data collection sequence, and the day-to-day reproducibility of τVO(2p) and τ'Δ[HHb] estimates, as determined by the CI(95), was appreciably improved by averaging of at least three MODs.

Indexed as

AdultCircadian RhythmExerciseExercise TestFemaleHeart RateHumansKineticsMaleMuscle, SkeletalOxygen ConsumptionPhysical ExertionPulmonary Gas ExchangeYoung Adult

Identifiers

PMID20931221
OpenAlexW1979255115

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.