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3 results on '"Vogt, S."'

1. Cadence-Power-Relationship during Decisive Mountain Ascents at the Tour de France.

Author

Vogt, S., Roecker, K., Schumacher, V.O., Pottgiesser, T., Dickhuth, H.-H., Schmid, A., and Heinrich, L.

Subjects
*CYCLIST physiology, *CADENCE (Cycling), *CYCLING techniques, *ATHLETES, *TOUR de France (Bicycle race)
Abstract

The aim of the study was to report the relation- ship between cadence and power developed by professional cyclists during high mountain as- cents of the Tour de France. From the 10 cyclists (30±4 years, 178±8 cm, 69±6 kg) involved in the study, 108 ascents were recorded and analyzed using a mobile power measurement device (SRM Training Systems, Julich, Germany). Based on topographic characteristics, the ascents were categorized into 1st and Hors Category (HC) climbs. During the ascents of the 1st Category climbs, power output averaged 312 ± 43 W (4.5 ± 0.6 W/kg) with a mean cadence of 73±6 rpm and a mean duration of 37:41±16:16 min. Power output averaged 294 ± 36 W (4.3 ± 0.6 W/ kg) at a mean cadence of 70 ± 6 rpm during 57:40±10:32 min on HC climbs. The maximal mean power for long durations (1800s) showed a mean power output of 327 W and 346 W for the 1st and HC climbs, respectively. The evaluation of the cadence-power output and the distance per pedaling cycle-power output relationship shows that high power outputs are mainly yielded by higher pedaling cadences and higher gears. [ABSTRACT FROM AUTHOR]

Published
2008
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2. Power Output during the Tour de France.

Author

Vogt S, Schumacher YO, Roecker K, Dickhuth HH, Schoberer U, Schmid A, and Heinrich L

Subjects
Adult, Competitive Behavior, France, Heart Rate physiology, Humans, Male, Physical Exertion, Prospective Studies, Time, Anaerobic Threshold physiology, Bicycling physiology, Muscle Contraction physiology, Muscle, Skeletal physiology, Oxygen Consumption physiology, Physical Endurance physiology
Abstract

The aim of this study was to evaluate the demands of riding a "Grand Tour" by monitoring both heart rate and power output in 15 professional cyclists. SRM power output profiles (SRM Trainingsystem, Jülich, Germany) were collected during 148 mass start stages during the 2005 Tour de France and analyzed to establish average power, heart rate (HR) and cadence produced in different terrain categories (flat [FLT]; semi-mountainous [SMT]; mountainous [MT]). The maximal mean power (MMP) for progressively longer durations was quantified. Average HR was similar between FLT (133 +/- 10 bpm) and SMT (134 +/- 8 bpm) but higher during MT (140 +/- 3 bpm). Average power output revealed a similar trend (FLT 218 +/- 21 W [3.1 +/- 0.3 W/kg], SMT 228 +/- 22 W [3.3 +/- 0.3 W/kg], and MT 234 +/- 13 W [3.3 +/- 0.2 W/kg]). Cadence during MT was approximately 6 - 7 rpm lower (81 +/- 15 rpm) compared to FLT or SMT. During MT stages, the MMP for 1800 sec. was highest (394 W vs. 342 W) but the MMP 15 was lower (836 W vs. 895 W) compared to FLT. The data document comprehensively the power output demands during the Tour de France.

Published
2007
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3. Scientific considerations for physiological evaluations of elite athletes.

Author

Schumacher YO, Vogt S, Roecker K, Schmid A, and Coyle EF

Subjects
Bicycling physiology, France, History, 20th Century, History, 21st Century, Humans, Sports Medicine methods, United States, Bicycling history, Muscle, Skeletal physiology, Physical Education and Training history, Physical Endurance, Sports Medicine history, Task Performance and Analysis
Abstract

This case describes the physiological maturation from ages 21 to 28 yr of the bicyclist who has now become the six-time consecutive Grand Champion of the Tour de France, at ages 27-32 yr. Maximal oxygen uptake (Vo(2max)) in the trained state remained at approximately 6 l/min, lean body weight remained at approximately 70 kg, and maximal heart rate declined from 207 to 200 beats/min. Blood lactate threshold was typical of competitive cyclists in that it occurred at 76-85% Vo(2max), yet maximal blood lactate concentration was remarkably low in the trained state. It appears that an 8% improvement in muscular efficiency and thus power production when cycling at a given oxygen uptake (Vo(2)) is the characteristic that improved most as this athlete matured from ages 21 to 28 yr. It is noteworthy that at age 25 yr, this champion developed advanced cancer, requiring surgeries and chemotherapy. During the months leading up to each of his Tour de France victories, he reduced body weight and body fat by 4-7 kg (i.e., approximately 7%). Therefore, over the 7-yr period, an improvement in muscular efficiency and reduced body fat contributed equally to a remarkable 18% improvement in his steady-state power per kilogram body weight when cycling at a given Vo(2) (e.g., 5 l/min). It is hypothesized that the improved muscular efficiency probably reflects changes in muscle myosin type stimulated from years of training intensely for 3-6 h on most days.

Published
2005
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