Review: VO₂ Max Research Synopsis

Overall Impression

Section 6.1 - Need for Study

• Good justification for studying non-athlete populations specifically, where data is sparse in Indian institutional settings.
• The distinction between athletic and sedentary cohorts is clearly articulated.

• "serves as the gold-standard estimate for establishing" - awkward phrasing. Try: "is the gold-standard measure of Cardiorespiratory Fitness (CRF) and aerobic capacity."
• The phrase "aerobic ceiling" appears multiple times. Use VO₂ max or "maximal aerobic capacity" consistently - "aerobic ceiling" is informal and non-standard.
• "robust institutional physiological cross-sections" is jargon-heavy and vague. Replace with: "reliable institutional baseline reference values."

Section 6.2 - Review of Literature

• Four relevant references are cited and summarized.
• Includes both Indian and international studies.

• Only 4 references in the literature review is thin. RGUHS typically expects at least 8-10 for the synopsis. Consider adding 4-6 more, particularly on:
  • Sex-based differences in VO₂ max (e.g., Astrand's classic work)
  • Indian normative data studies
  • BMI-VO₂ max correlation studies
• Buttar K.K. (2022) is cited in the text but does not appear in the numbered reference list (Section 8). This is a significant inconsistency that must be fixed before submission.
• Bute & Shete (2014) is cited in-text but in Section 8 it is listed as reference #7 with an incomplete journal name - "IOSR J Sports Phys Educ" should be verified and the volume/page numbers are listed (1:27-9) but the journal citation is informal. Confirm the full title and DOI.
• The literature summaries read more like what the studies "proved" than balanced academic summaries. Tone down absolute statements like "highly significant" and "vital independent predictors."

Section 6.3 - Objectives

• Primary and secondary objectives are clearly separated and specific.
• The secondary objective on BMI correlation is a logical add-on.

• "evaluate, compare, and establish descriptive reference baseline values" - if this is purely descriptive (no comparison group beyond male/female), "compare" is acceptable, but make sure the study actually delivers this comparison clearly.
• Minor: "demonstrate an active correlation" - remove "active." Just say "demonstrate a significant correlation."

Section 7 - Materials and Methods

• Pre-test preparation protocol (sleep, caffeine, meal timing, warm-up) is detailed and shows good procedural rigour.
• Use of a validated gas analyzer (AD Instruments + LabChart 8) is appropriate for a direct VO₂ max measurement - this is the gold standard.

• Sample size: N = 40 (27 male, 13 female) is small, and the male-to-female ratio is 2:1, which is unbalanced for a comparative study. You should provide a formal sample size calculation (power analysis). What power (typically 80%) and effect size were used? If this was not done, the limitation must be acknowledged explicitly.
• Purposive sampling is a non-probability method and introduces selection bias. This must be listed as a limitation.
• The study period (December 2025 - January 2026) is only 2 months - this is very tight for recruiting, testing, and collecting data from 40 participants while also managing academic commitments. Confirm this timeline is realistic.
• "Participants will be instructed to come light clothed" - should be "lightly clothed."
• The test termination criteria mention "90% of predicted maximum Heart Rate" - specify the formula used (220 - age? Tanaka formula?). This is important for reproducibility.
• No mention of how participants were monitored for adverse events during the test beyond "stopped immediately if discomfort" - consider adding cardiac monitoring (ECG or at minimum SpO₂ monitoring) for safety documentation.
• "atleast" should be "at least" (two words).

Section 7.2.I - Statistical Analysis Plan

• Pearson's r assumes linearity and normality - appropriate here, but also note the sample size limitation (N=40 is modest for correlation).
• You report a result (p = 0.0036) in the analysis plan section - this looks like the preliminary results are mixed into the methods. Either separate this into a "Preliminary Results" section clearly, or remove it from the methods section.

Section 8 - References

• Only 7 references listed, but Buttar K.K. et al. (2022) is cited in Section 6.2 and missing from this list. Add it.
• Reference #1 (Srivastava 2024) - the citation is incomplete: "Cureus [Internet]. 2024 May 26" - missing volume, issue, and article number/page. Complete it.
• Reference #3 (Sharma 2016) - the URL is the full citation link; prefer a DOI if available.
• Reference #5 (Kausar 2015) - listed as "[cited 2025 May 15]" with no volume/issue/page. Complete the citation.
• References should follow a consistent format - currently a mix of Vancouver and informal styles. Pick one (RGUHS uses Vancouver) and apply it uniformly.
• Add references for: the statistical tests used (SPSS citation), the gas analyzer/equipment, and any VO₂ max normative reference tables you plan to compare your data against.

Informed Consent Form (Annexure 1)

• Well-written and covers all standard elements (voluntary participation, right to withdraw, confidentiality, data use).
• The Kannada translation is included, which is appropriate for the local population - good practice.
• Minor: Point 3 in the English version mentions "academic standing" - this is fine for a student population.

Case Record Form (Annexure 2)

• The questionnaire covers the key exclusion criteria variables (chronic illness, congenital illness, flu symptoms, disability, pregnancy).
• Missing: No field for recording actual VO₂ max value, HR at peak, Watts at peak, or test duration. These are primary outcome variables and must be in the CRF.
• The question on "Regular Gym Activity Duration" needs a unit prompt (hours/week? days/week?).
• "History of smoking" / "alcohol intake" - consider adding a field for pack-years or units/week for more meaningful data.

Summary of Priority Fixes