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VOL. 8, ISSUE 2 (2026)
Comparative effects of different continuous training protocols on cardiorespiratory endurance and hematological variables
Authors
Arnab Roy, Neelam Yadav
Abstract
Continuous aerobic training is widely
recognized as an effective method for enhancing cardiorespiratory fitness and
overall physiological efficiency. Although moderate-intensity continuous
training (MICT) is commonly recommended for improving aerobic capacity, growing
evidence suggests that higher-intensity continuous training (HICT) may produce
greater central and peripheral adaptations. However, limited research has
comparatively examined both cardiorespiratory and hematological responses to
different continuous training intensities within a controlled experimental
framework. The present study aimed to compare the effects of MICT and HICT on
cardiorespiratory endurance and selected hematological variables in healthy
young adults. Sixty healthy male university students aged 18–24 years were
randomly assigned to MICT (60–70% HRmax), HICT (75–85% HRmax), or a
non-training control group (n = 20 each). Participants completed a 10-week
intervention consisting of four sessions per week, each lasting 40 minutes.
Cardiorespiratory endurance was evaluated through maximal oxygen uptake
(VO₂max) using a standardized treadmill protocol. Hemoglobin concentration, red
blood cell count, and hematocrit levels were measured using an automated
hematology analyzer. Data were analyzed using analysis of covariance with
pre-test values as covariates, and effect sizes (partial η²) along with 95%
confidence intervals were reported. Both training groups demonstrated
significant improvements in VO₂max compared to the control group (p <.05),
with greater gains observed in HICT. Significant increases in hematological
parameters were also more pronounced in the HICT group. These findings indicate
that high-intensity continuous training produces superior cardiorespiratory and
hematological adaptations compared to moderate-intensity training.
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Pages:58-64
How to cite this article:
Arnab Roy, Neelam Yadav "Comparative effects of different continuous training protocols on cardiorespiratory endurance and hematological variables". International Journal of Physical Education, Exercise and Sports, Vol 8, Issue 2, 2026, Pages 58-64
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