Health, Exercise, and Sports Sciences ETDs

Publication Date

Winter 12-14-2020

Abstract

The objectives of this study were to identify the lactate threshold (LT) and the first ventilatory threshold (VT) during resistance exercise in a discontinuous incremental test, determine if both thresholds were observed at the same relative workload, and to analyze the acute cardiorespiratory and metabolic responses during a separate constant load resistance exercise protocol. Twelve healthy, trained women (n = 6) and men (n = 6) performed a maximal running test on a treadmill followed by three protocols using the hexagonal bar deadlift (HBDL) exercise. The treadmill test was performed to determine maximal oxygen consumption, peak heart rate, and lactate maximum. The HBDL protocols performed included a 1RM to determine maximal strength, an incremental test to identify both thresholds, and a constant load session at the LT intensity to determine if selected physiological parameters demonstrated steady-state responses. The relative intensity of the LT and VT was 31.67 ± 6.15% and 29.71 ± 3.49% 1RM respectively (p = .45). During constant load exercise, no significant difference was observed in blood lactate from set 9 (S9) through S15 (end of exercise) (7.44 ± 2.04 and 8.33 ± 2.05 mmol·L-1, respectively, p = .99), in oxygen consumption from S3 through S15 (25.10 ± 1.60 and 27.73 ± 3.68 ml·kg-1·min-1, respectively, p = 1.00) or in heart rate from S9 through S15 (153.25 ± 13.58 and 159.88 ± 12.61 beats·min-1, respectively, p = .19). There were no statistically significant differences in physiological responses during either the incremental or constant load protocols between women and men, with the exception men had a lower HR during CL. This study demonstrated that using the HBDL exercise, both a lactate and ventilatory threshold can be identified at the same relative workload in trained women and men. Additionally, intensity equivalent to the lactate threshold can be maintained in an intermittent constant load exercise session to elicit steady state responses in blood lactate, oxygen consumption, and heart rate. Implications of these results indicate the HBDL exercise performed at the LT intensity may be effective for improving cardiorespiratory and muscular fitness for men and women.

Keywords

resistance exercise, lactate threshold, hexagonal bar deadlift, heart rate

Document Type

Dissertation

Degree Name

Physical Education, Sports and Exercise Science

Level of Degree

Doctoral

Department Name

Health, Exercise, and Sports Sciences

First Committee Member (Chair)

Leonard Kravitz

Second Committee Member

Christine Mermier

Third Committee Member

Fabiano Amorim

Fourth Committee Member

Tony Nunez

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