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COMPARISON OF CARDIORESPIRATORY RESPONSES OF MODERATELY TRAINED MEN AND WOMEN USING TWO DIFFERENT TREADMILL PROTOCOLS

MILLER GREGORY S.; DOUGHERTY, PATRICK J.; GREEN, JOHN S.; CROUSE, STEPHEN F.
The Journal of Strength & Conditioning Research: November 2007
ORIGINAL RESEARCH: PDF Only

ABSTRACTIn practice, the Bruce protocol is the most commonly used treadmill protocol to assess maximal oxygen consumption (JOURNAL/jscr/04.02/00124278-200711000-00015/ENTITY_OV0622/v/2017-07-20T235336Z/r/image-pngO2max). It has been suggested that a running protocol (e.g., Åstrand) may elicit a comparatively higher JOURNAL/jscr/04.02/00124278-200711000-00015/ENTITY_OV0622/v/2017-07-20T235336Z/r/image-pngO2max and different cardiorespiratory responses when applied to moderately trained runners. Thus, the purpose of this study was to compare JOURNAL/jscr/04.02/00124278-200711000-00015/ENTITY_OV0622/v/2017-07-20T235336Z/r/image-pngO2max and other cardiorespiratory responses as elicited by the standard Bruce and a modified Åstrand treadmill protocol in moderately trained runners. Fifteen women (age = 21 years, height = 171.5 cm, weight = 63 kg, and body fat = 18%) and 15 men (age = 26 years, height = 177 cm, weight = 72 kg, and body fat = 9%) who were moderately trained runners completed a standard Bruce and modified Åstrand protocol (random order), separated by approximately 7 days. Heart rate, Borg ratings of perceived exertion, blood pressure, and pulmonary gas exchange variables were measured during the exercise tests using standard laboratory procedures. This study revealed that JOURNAL/jscr/04.02/00124278-200711000-00015/ENTITY_OV0622/v/2017-07-20T235336Z/r/image-pngO2max values between the Bruce protocol (51.3 ± 11.6 ml·kg−1·min−1) and modified Åstrand (51.5 ± 10.9 ml·kg−1·min−1) were not significantly different in either the men or the women. However, the Bruce protocol elicited significantly higher maximum treadmill time in men and maximum respiratory exchange ratio (RERmax) and maximum minute ventilation (VEmax) values in both genders. Conversely, the modified Åstrand elicited a higher HRmax. These data suggest that JOURNAL/jscr/04.02/00124278-200711000-00015/ENTITY_OV0622/v/2017-07-20T235336Z/r/image-pngO2max in both moderately trained men and women runners is independent of treadmill protocol despite differences in HRmax, RERmax, and VEmax.

In practice, the Bruce protocol is the most commonly used treadmill protocol to assess maximal oxygen consumption (JOURNAL/jscr/04.02/00124278-200711000-00015/ENTITY_OV0622/v/2017-07-20T235336Z/r/image-pngO2max). It has been suggested that a running protocol (e.g., Åstrand) may elicit a comparatively higher JOURNAL/jscr/04.02/00124278-200711000-00015/ENTITY_OV0622/v/2017-07-20T235336Z/r/image-pngO2max and different cardiorespiratory responses when applied to moderately trained runners. Thus, the purpose of this study was to compare JOURNAL/jscr/04.02/00124278-200711000-00015/ENTITY_OV0622/v/2017-07-20T235336Z/r/image-pngO2max and other cardiorespiratory responses as elicited by the standard Bruce and a modified Åstrand treadmill protocol in moderately trained runners. Fifteen women (age = 21 years, height = 171.5 cm, weight = 63 kg, and body fat = 18%) and 15 men (age = 26 years, height = 177 cm, weight = 72 kg, and body fat = 9%) who were moderately trained runners completed a standard Bruce and modified Åstrand protocol (random order), separated by approximately 7 days. Heart rate, Borg ratings of perceived exertion, blood pressure, and pulmonary gas exchange variables were measured during the exercise tests using standard laboratory procedures. This study revealed that JOURNAL/jscr/04.02/00124278-200711000-00015/ENTITY_OV0622/v/2017-07-20T235336Z/r/image-pngO2max values between the Bruce protocol (51.3 ± 11.6 ml·kg−1·min−1) and modified Åstrand (51.5 ± 10.9 ml·kg−1·min−1) were not significantly different in either the men or the women. However, the Bruce protocol elicited significantly higher maximum treadmill time in men and maximum respiratory exchange ratio (RERmax) and maximum minute ventilation (VEmax) values in both genders. Conversely, the modified Åstrand elicited a higher HRmax. These data suggest that JOURNAL/jscr/04.02/00124278-200711000-00015/ENTITY_OV0622/v/2017-07-20T235336Z/r/image-pngO2max in both moderately trained men and women runners is independent of treadmill protocol despite differences in HRmax, RERmax, and VEmax.

Address correspondence to Gregory S. Miller, gm1001@hlkn.tamu.edu.

© 2007 National Strength and Conditioning Association