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Related Experiment Videos

Plasma volume during weight lifting.

S K Craig1, W C Byrnes, S J Fleck

  • 1Integrative Physiology Department, University of Colorado at Boulder, Boulder, CO 80309-0354, USA.

International Journal of Sports Medicine
|October 26, 2007
PubMed
Summary
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Resistance training intensity impacts hematocrit (Hct), hemoglobin (Hb), and plasma volume (PV) levels. Higher intensity (10 RM) resistance exercise causes greater changes in Hct, Hb, and PV compared to lower intensity (5 RM).

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Physiology

Background:

  • Understanding hematological responses to resistance training is crucial for optimizing performance and recovery.
  • Previous research has explored changes in hematocrit (Hct), hemoglobin (Hb), and plasma volume (PV) during exercise, but protocol-specific differences require further investigation.

Purpose of the Study:

  • To examine the magnitude and pattern of Hct, Hb, and PV responses during and after two resistance training protocols: a ten-repetition maximum (10 RM) and a five-repetition maximum (5 RM).
  • To compare the hematological effects of high-intensity (10 RM) versus moderate-intensity (5 RM) resistance exercise.

Main Methods:

  • Twelve college-aged males were divided into 10 RM and 5 RM groups, undergoing familiarization workouts before testing.

Related Experiment Videos

  • Participants completed three sets of nine exercises per protocol, with varying rest periods (1-2 min for 10 RM, 3 min for 5 RM).
  • Venous blood samples were collected at rest, after each set, and during recovery to measure Hct, Hb, and PV.

    • Main Results:

    • Loaded exercise significantly altered Hct, Hb, and PV compared to control conditions.
    • The 10 RM protocol elicited significantly greater increases in Hct (6.2%) and Hb (2.2 g/dL) than the 5 RM protocol (Hct: 3.5%, Hb: 1.2 g/dL).
    • Plasma volume decreased more significantly with the 10 RM protocol (-22.6%) compared to the 5 RM protocol (-13.0%), mirroring Hct and Hb trends.

    Conclusions:

    • The magnitude and pattern of Hct, Hb, and PV responses are dependent on the resistance training protocol intensity.
    • Higher intensity resistance training (10 RM) leads to more pronounced hematological changes than lower intensity training (5 RM).
    • These findings highlight the importance of training intensity in modulating blood volume and oxygen-carrying capacity during resistance exercise.