Maximum Phonation Time as a Predictor of Lactate Threshold during Intermittent Incremental Endurance Test

AbstractThe purpose of this study was to assess the validity of a new basketball-specific complex test (BBCT) based on the ascertained match performance.Fourteen female professional basketball players (ages: 23.4 ± 1.8 years) performed the BBCT and a treadmill test (TT) at the beginning of pre-season training. Lactate, heart rate (HR), time, shooting precision and number of errors were measured during the four test sequences of the BBCT (short distance sprinting with direction changes, with and without a ball; fast break; lay-up parcours; sprint endurance test). In addition, lactate threshold (LT) and HR were assessed at selected times throughout the TT and the BBCT and over 6 (TT) or 10 (BBCT) minutes after the tests. The match performance score (mps) was calculated on specific parameters (e. g. points) collected during all matches during the subsequent season (22 matches). The mps served as the “gold standard” within the validation process for the BBCT and the TT.TT parameters demonstrated an explained variance (EV) between 0 % (HR recovery) and 11 % (running speed at 6 mmol/l LT). The EV from the BBCT was higher and ranged from 0 % (HR recovery 6 minutes after end of exercise) to 28 % (sprint endurance test after 8 of 10 sprints). Ten out of 21 BBCT parameters (48 %) and 2 out of 5 TT parameters (40 %) demonstrated an EV higher than 10 %. Average EV for all parameters was 12 % (BBCT) and 6 % (TT), respectively. The BBCT had a higher validity than the TT for predicting match performance. These findings suggest that coaches and scientists should consider using the BBCT testing protocol to estimate the match performance abilities of elite female players.

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Differences in player position running velocity at lactate thresholds among male professional German soccer players

10.1101/592188 ◽

2019 ◽

Author(s):

René Schwesig ◽

Stephan Schulze ◽

Lars Reinhardt ◽

Kevin G. Laudner ◽

Karl-Stefan Delank ◽

...

Keyword(s):

Body Mass ◽

Test Performance ◽

Lactate Threshold ◽

Reference Data ◽

Body Height ◽

Soccer Players ◽

Specific Reference ◽

Treadmill Test ◽

Endurance Test ◽

Running Performance

ABSTRACTThis study investigated the differences in running velocities at specific lactate thresholds among male German soccer players. One hundred fifty-two professional (3rd league: n=82; 4th league: n=70) male soccer players (mean ± SD; age: 24.7 ± 4.38 years, body mass: 80.7 ± 7.36 kg, body height: 1.83 ± 0.06 m) volunteered for the investigation. Players were categorized as goalkeepers, central defenders, central midfielders, wings and forwards. Players completed a treadmill test, at incremental speeds, to determine running velocity at different blood lactate concentrations (v2=2 mmol/l; v4=4 mmol/l; v6=6 mmol/l). Results indicate that, wings displayed the lowest body mass (76.2 ± 6.08 kg) and body height (1.79 ± 0.06 m). In contrast, goalkeepers were the tallest athletes in the whole sample (1.90 ± 0.03 m), forwards were the heaviest players (85.4 ± 6.03 kg). In addition, we detected the largest difference between positions for running velocity at the lactate threshold v2 (p=0.002). The running data revealed that only the goalkeepers had significantly lower velocities at the lactate thresholds compared to the field players. The central midfielders showed the highest performance level at the lactate thresholds (v2: 12.5 ± 1.20 km/h; v4: 15.2 ± 1.14 km/h; v6: 16.6 ± 1.13 km/h). In conclusion, this study provides soccer and position-specific reference data for the performance of male professional German soccer players in order to evaluate the running performance in a valid way. In this context, it is necessary to extend the database for the second and first league. Furthermore, it is important to assess the running performance during competition matches over the entire season in order to validate the endurance test performance data.

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Positional differences in some physiological parameters obtained by the incremental field endurance test among elite handball players

Kinesiology ◽

10.26582/k.53.1.1 ◽

2021 ◽

Vol 53 (1) ◽

pp. 3-11

Author(s):

Uroš Mohorič ◽

Marko Šibila ◽

Boro Štrumbelj

Keyword(s):

Oxygen Uptake ◽

Blood Lactate ◽

Lactate Threshold ◽

Pulmonary Ventilation ◽

Lactate Concentration ◽

Blood Lactate Concentration ◽

Physiological Parameters ◽

Endurance Test ◽

Blood Lactate Accumulation ◽

Insight Into

The purpose of the study was to assess assumed differences in some physiological parameters, obtained by an incremental intermittent running field test 30–15IFT, among elite handball players to get an insight into the specifics of aerobic capacity profiles of players in different playing positions. Twenty-four elite male handball players were tested using the Cosmed K4 portable telemetry system. The following parameters were analysed: running velocity, heart rate, oxygen uptake, relative oxygen uptake, pulmonary ventilation breath-by-breath, at the three points—lactate threshold (LT), onset of blood lactate accumulation (OBLA), and at the peak velocity achieved on the test (v30–15IFT). Additionally, blood lactate concentration was analysed at v30–15IFT. The players were divided in three groups based on their playing positions: eight backcourt players, eight wing players and eight pivot players. In terms of both the statistically significant and non-significant differences, the wings achieved slightly different results in comparison to the backcourt players and pivots. The wings reached a statistically significant higher velocity at the LT than the players of the other two groups and a significantly higher velocity than the pivots at the OBLA. At all the three points, wings presented the highest HR values, meaning they can operate at higher intensities still within the aerobic work zone. This would probably allow wing players to longer persist in handball game.

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