| Title: |
Metabolic Heat Production Modulates the Cardiovascular Drift–V̇O2max Relationship Independent of Aerobic Fitness in Women |
| Authors: |
STONE, TORI; BURNASH, SARAH G.; EARLEY, RYAN L.; MULHOLLAND, ANNIE M.; YODER, HILLARY A.; MACDONALD, HAYLEY V.; RICHARDSON, MARK T.; WINGO, JONATHAN E. |
| Source: |
Medicine & Science in Sports & Exercise ; volume 57, issue 1, page 181-191 ; ISSN 1530-0315 0195-9131 |
| Publisher Information: |
Ovid Technologies (Wolters Kluwer Health) |
| Publication Year: |
2024 |
| Description: |
Introduction/Purpose The purpose of this study was to test the hypothesis that cardiovascular (CV) drift and associated decrements in maximal oxygen uptake (V̇O 2max ) are greater in high-fit compared with low-fit women during exercise at the same %V̇O 2max , but comparable at the same rate of metabolic heat production. Methods Six high-fit (HI) and six low-fit (LO) women cycled in 35°C for 15 or 45 min at the same relative intensity (60% V̇O 2max ; 15REL and 45REL) or fixed rate of heat production (500 W; 15FX and 45FX), immediately followed by a graded exercise test to measure V̇O 2max . The separate 15- and 45-min trials permitted measurements of V̇O 2max over the same time interval as CV drift. Results During 45REL, higher heat production in HI (496 ± 51 vs 364 ± 44 W in LO) resulted in greater end-exercise core temperature (38.7°C ± 0.4°C vs 38.2°C ± 0.1°C, P = 0.03), greater increases in HR (15 bpm (10%) vs 10 bpm (6%), P = 0.03) and decreases in stroke volume (11 mL per beat (16%) vs 5 mL per beat (8%), P = 0.001), and larger reductions in V̇O 2max (16% vs 5%, P = 0.04) compared with LO. During 45FX, temperature responses, CV drift, and decreased V̇O 2max were not different between groups (all P > 0.05), despite differences in %V̇O 2max (60% vs 75% for HI and LO, respectively). Conclusions We conclude metabolic heat production modulates the CV drift–V̇O 2max relationship, independent of fitness level. These results support previous findings showing the magnitude of CV drift is proportional to reductions in V̇O 2max . |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1249/mss.0000000000003543 |
| DOI: |
10.1249/MSS.0000000000003543 |
| Availability: |
https://doi.org/10.1249/mss.0000000000003543; https://journals.lww.com/10.1249/MSS.0000000000003543 |
| Accession Number: |
edsbas.8D3D0997 |
| Database: |
BASE |