title: Shorter intervals at peak SV vs.V̇O2max may yield high SV with less physiological stress.
abstract: The purpose of this study was to evaluate whether greater and sustainable stroke volume (SV) responses may be obtained by exercise intensities corresponding to peak SV (SVpeak) vs. maximal O2 consumption (VO2max), and short vs. long intervals (SI vs. LI). Nine moderate- to well-trained male athletes competing at regional level specialists of cyclist, track and field volunteered to take part in the study (VO2max: 59.7 ± 7.4 mL·min(-1)·kg(-1)). Following familiarisation sessions, VO2max was determined, and then SVpeak was evaluated using exercise intensities at 40%-100% of VO2max by nitrous-oxide rebreathing (N2ORB) method. Then each separate participant exercised wattages corresponding to individual VO2max and SVpeak during both SI (SIVO2max and SI(SVpeak)) and LI (LIVO2max and LI(SVpeak)) workouts on a cycle ergometer. Main results showed that both SIVO2max and SI(SVpeak) yielded greater SV responses than LIVO2max and LI(SVpeak) (p ≤ 0.05). Mean SV responses were greater in LI(SVpeak) than in LIVO2max (p ≤ 0.05), but there was no statistical difference between SI(SVpeak) and SIVO2max. However, there was significantly less physiological stress based on VO2, respiratory exchange ratio, heart rate and rate of perceived exhaustion in SVpeak than in [Formula: see text] intensities (p ≤ 0.05). Moreover, SV responses at exercise phases increased in the early stages and remain stable until the end of SIVO2max and SI(SVpeak) workouts (p > 0.05), while they were gradually decreasing in LIVO2max and LI(SVpeak) sessions (p ≤ 0.05). In conclusion, if the aim of a training session is to improve SVpeak with less physiological stress, SI(SVpeak) seems a better alternative than other modalities tested in the present study.
authors.affiliation: a School of Physical Education and Sports, Coaching Education Department , Ege University , Izmir , Turkey.
authors.forename: Muzaffer
authors.initials: M
authors.lastname: Colakoglu
authors.affiliation: a School of Physical Education and Sports, Coaching Education Department , Ege University , Izmir , Turkey.
authors.forename: Ozgur
authors.initials: O
authors.lastname: Ozkaya
authors.affiliation: a School of Physical Education and Sports, Coaching Education Department , Ege University , Izmir , Turkey.
authors.forename: Gorkem Aybars
authors.initials: GA
authors.lastname: Balci
authors.affiliation: a School of Physical Education and Sports, Coaching Education Department , Ege University , Izmir , Turkey.
authors.forename: Bulent
authors.initials: B
authors.lastname: Yapicioglu
mesh_terms: D000328:Adult; D056352:Athletes; D015444:Exercise / Q000502:physiology*; D005221:Fatigue; D006339:Heart Rate; D006801:Humans; D008297:Male; D009609:Nitrous Oxide / Q000378:metabolism; D010101:Oxygen Consumption; D064797:Physical Conditioning, Human / Q000379:methods*; D010806:Physical Education and Training / Q000379:methods; D010807:Physical Endurance / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology*; D012119:Respiration; D013177:Sports; D013312:Stress, Physiological; D013318:Stroke Volume; D055815:Young Adult
chemical_list: D009609:Nitrous Oxide
keywords: Aerobic power; N2ORB; maximal O2 consumption; nitrous-oxide; rebreathing; stroke volume