Stroke volume responses may be related to the gap between peak and maximal O 2 consumption
Makaleler > Tam Makale · 2016
Yazarlar: Muzaffer COLAKOGLU, Özgür ÖZKAYA, Görkem Aybars BALCI, Bülent YAPICIOĞLU
Isokinetics and Exercise Science, SCI Expanded İndekslerine Giren Dergi, Uluslararası, Wos, 2016, cilt 24, ss 133-139
DOI: 10.3233/ies-160610
Özet
BACKGROUND: Although several studies have focused on maximal O 2 uptake ([Formula: see text] O 2max ) measured by a verification phase following the determination of peak O 2 uptake ([Formula: see text] O 2peak ) by a graded exercise test, an explanation for the underlying mechanisms of the difference between[Formula: see text] O 2peak and confirmed [Formula: see text] O 2max is scant. OBJECTIVE: To explore the hypothesis that when the difference between [Formula: see text] O 2peak and [Formula: see text] O 2max (Δ[Formula: see text] O 2 ) increases, the gap between peak stroke volume (SV peak ) and SV level corresponding to [Formula: see text] O 2peak velocities (Δ SV) grows. METHODS: Nine moderately to well-trained male athletes([Formula: see text] O 2max : 60.2 ± 7 mL ⋅ min -1 ⋅ kg -1 ) volunteered to take part in the study. Following familiarization session, volunteers were asked to perform submaximal and maximal graded exercise tests. Then, constant-loading SV peak tests (using wattages in a range from 40-100% of [Formula: see text] O 2peak ) and verification phase (using wattages corresponding with 100-110% of [Formula: see text] O 2peak ) were conducted in a climatic chamber. RESULTS: The Δ[Formula: see text] O 2 was well correlated withΔ SV (Pearson r= 0.89; p≤ 0.001). The mean SV peak of participants corresponded to 60.3 ± 18% of [Formula: see text] O 2peak .[Formula: see text] O 2max was significantly greater (11.2%) than [Formula: see text] O 2peak (60.2 ± 7 vs. 54.2 ± 8.1 mL ⋅ min -1 ⋅ kg -1 ) (p ≤ 0.01). CONCLUSIONS: [Formula: see text] O 2peak and [Formula: see text] O 2max differences may be related to the gap between SV peak and SV at [Formula: see text] O 2peak .