scholarly journals Criterion Validity of an Automated Method of Detecting Live Play Periods in Basketball

2021 ◽  
Vol 3 ◽  
Author(s):  
Jodie Palmer ◽  
Rodrigo Bini ◽  
Daniel Wundersitz ◽  
Michael Kingsley
Keyword(s):  
Oxygen Uptake ◽  
Exercise Intensity ◽  
Moving Average ◽  
Criterion Validity ◽  
Automated Method ◽  
Intensity Threshold ◽  
Relative Exercise Intensity ◽  
Input Parameters ◽  
Sample Window ◽  
Average Sample

This study aimed to develop an automated method to detect live play periods from accelerometry-derived relative exercise intensity in basketball, and to assess the criterion validity of this method. Relative exercise intensity (% oxygen uptake reserve) was quantified for two men's semi-professional basketball matches. Live play period durations were automatically determined using a moving average sample window and relative exercise intensity threshold, and manually determined using annotation of video footage. The sample window duration and intensity threshold were optimised to determine the input parameters for the automated method that would result in the most similarity to the manual method. These input parameters were used to compare the automated and manual active play period durations in another men's semi-professional match and a women's professional match to assess the criterion validity of the automated method. The optimal input parameters were a 9-s sample window and relative exercise intensity threshold of 31% oxygen uptake reserve. The automated method showed good relative (ρ = 0.95–0.96 and ICC = 0.96–0.98, p < 0.01) and absolute (median bias = 0 s) agreement with the manual method. These findings support the use of an automated method using accelerometry-derived relative exercise intensity and a moving average sample window to detect live play periods in basketball.

Large differences in peak oxygen uptake do not independently alter changes in core temperature and sweating during exercise

2011 ◽  
Vol 301 (3) ◽  
pp. R832-R841 ◽  
Author(s):  
Ollie Jay ◽  
Anthony R. Bain ◽  
Tomasz M. Deren ◽  
Matthew Sacheli ◽  
Matthew N. Cramer
Keyword(s):  
Oxygen Uptake ◽  
Body Mass ◽  
Core Temperature ◽  
Heat Production ◽  
Exercise Intensity ◽  
Peak Oxygen Uptake ◽  
Whole Body ◽  
Complex Interactions ◽  
Relative Exercise Intensity ◽  
Sudomotor Activity

The independent influence of peak oxygen uptake (V̇o2 peak) on changes in thermoregulatory responses during exercise in a neutral climate has not been previously isolated because of complex interactions between V̇o2 peak, metabolic heat production (Hprod), body mass, and body surface area (BSA). It was hypothesized that V̇o2 peak does not independently alter changes in core temperature and sweating during exercise. Fourteen males, 7 high (HI) V̇o2 peak: 60.1 ± 4.5 ml·kg−1·min−1; 7 low (LO) V̇o2 peak: 40.3 ± 2.9 ml·kg−1·min−1 matched for body mass (HI: 78.2 ± 6.1 kg; LO: 78.7 ± 7.1 kg) and BSA (HI: 1.97 ± 0.08 m2; LO: 1.94 ± 0.08 m2), cycled for 60-min at 1) a fixed heat production (FHP trial) and 2) a relative exercise intensity of 60% V̇o2 peak (REL trial) at 24.8 ± 0.6°C, 26 ± 10% RH. In the FHP trial, Hprod was similar between the HI (542 ± 38 W, 7.0 ± 0.6 W/kg or 275 ± 25 W/m2) and LO (535 ± 39 W, 6.9 ± 0.9 W/kg or 277 ± 29 W/m2) groups, while changes in rectal (Tre: HI: 0.87 ± 0.15°C, LO: 0.87 ± 0.18°C, P = 1.00) and aural canal (Tau: HI: 0.70 ± 0.12°C, LO: 0.74 ± 0.21°C, P = 0.65) temperature, whole-body sweat loss (WBSL) (HI: 434 ± 80 ml, LO: 440 ± 41 ml; P = 0.86), and steady-state local sweating (LSRback) ( P = 0.40) were all similar despite relative exercise intensity being different (HI: 39.7 ± 4.2%, LO: 57.6 ± 8.0% V̇o2 peak; P = 0.001). At 60% V̇o2 peak, Hprod was greater in the HI (834 ± 77 W, 10.7 ± 1.3 W/kg or 423 ± 44 W/m2) compared with LO (600 ± 90 W, 7.7 ± 1.4 W/kg or 310 ± 50 W/m2) group (all P < 0.001), as were changes in Tre (HI: 1.43 ± 0.28°C, LO: 0.89 ± 0.19°C; P = 0.001) and Tau (HI: 1.11 ± 0.21°C, LO: 0.66 ± 0.14°C; P < 0.001), and WBSL between 0 and 15, 15 and 30, 30 and 45, and 45 and 60 min (all P < 0.01), and LSRback ( P = 0.02). The absolute esophageal temperature (Tes) onset for sudomotor activity was ∼0.3°C lower ( P < 0.05) in the HI group, but the change in Tes from preexercise values before sweating onset was similar between groups. Sudomotor thermosensitivity during exercise were similar in both FHP ( P = 0.22) and REL ( P = 0.77) trials. In conclusion, changes in core temperature and sweating during exercise in a neutral climate are determined by Hprod, mass, and BSA, not V̇o2 peak.

Self-paced exercise in hot and cool conditions is associated with the maintenance of %V̇o2peak within a narrow range

2015 ◽  
Vol 118 (10) ◽  
pp. 1258-1265 ◽  
Author(s):  
Julien D. Périard ◽  
Sébastien Racinais
Keyword(s):  
Heart Rate ◽  
Relative Humidity ◽  
Oxygen Uptake ◽  
Exercise Intensity ◽  
Power Output ◽  
Time Course ◽  
Perceived Exertion ◽  
Narrow Range ◽  
Ratings Of Perceived Exertion ◽  
Relative Exercise Intensity

This study examined the time course and extent of decrease in peak oxygen uptake (V̇o2peak) during self-paced exercise in HOT (35°C and 60% relative humidity) and COOL (18°C and 40% relative humidity) laboratory conditions. Ten well-trained cyclists completed four consecutive 16.5-min time trials (15-min self-paced effort with 1.5-min maximal end-spurt to determine V̇o2peak) interspersed by 5 min of recovery on a cycle ergometer in each condition. Rectal temperature increased significantly more in HOT (39.4 ± 0.7°C) than COOL (38.6 ± 0.3°C; P < 0.001). Power output was lower throughout HOT compared with COOL ( P < 0.001). The decrease in power output from trial 1 to 4 was ∼16% greater in HOT ( P < 0.001). Oxygen uptake (V̇o2) was lower throughout HOT than COOL ( P < 0.05), except at 5 min and during the end-spurt in trial 1. In HOT, V̇o2peak reached 97, 89, 85, and 85% of predetermined maximal V̇o2, whereas in COOL 97, 94, 93, and 92% were attained. Relative exercise intensity (%V̇o2peak) during trials 1 and 2 was lower in HOT (∼84%) than COOL (∼86%; P < 0.05), decreasing slightly during trials 3 and 4 (∼80 and ∼85%, respectively; P < 0.05). However, heart rate was higher throughout HOT ( P = 0.002), and ratings of perceived exertion greater during trials 3 and 4 in HOT ( P < 0.05). Consequently, the regulation of self-paced exercise appears to occur in conjunction with the maintenance of %V̇o2peak within a narrow range (80-85% V̇o2peak). This range widens under heat stress, however, when exercise becomes protracted and a disassociation develops between relative exercise intensity, heart rate, and ratings of perceived exertion.

scholarly journals Validity of Reporting Oxygen Uptake Efficiency Slope from Submaximal Exercise Using Respiratory Exchange Ratio as Secondary Criterion

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Wilby Williamson ◽  
Jonathan Fuld ◽  
Kate Westgate ◽  
Karl Sylvester ◽  
Ulf Ekelund ◽  
...  
Keyword(s):  
Oxygen Uptake ◽  
Test Data ◽  
Exercise Intensity ◽  
Respiratory Exchange Ratio ◽  
Fold Increase ◽  
Moderate Intensity ◽  
Uptake Efficiency ◽  
Highly Correlated ◽  
Oxygen Uptake Efficiency Slope ◽  
Treadmill Protocol

Background. Oxygen uptake efficiency slope (OUES) is a reproducible, objective marker of cardiopulmonary function. OUES is reported as being relatively independent of exercise intensity. Practical guidance and criteria for reporting OUES from submaximal tests has not been established.Objective. Evaluate the use of respiratory exchange ratio (RER) as a secondary criterion for reporting OUES.Design. 100 healthy volunteers (53 women) completed a ramped treadmill protocol to exhaustive exercise. OUES was calculated from data truncated to RER levels from 0.85 to 1.2 and compared to values generated from full test data. Results. Mean (sd) OUES from full test data and data truncated to RER 1.0 and RER 0.9 was 2814 (718), 2895 (730), and 2810 (789) mL/min per 10-fold increase in VE, respectively. Full test OUES was highly correlated with OUES from RER 1.0 (r=0.9) and moderately correlated with OUES from RER 0.9 (r=0.79).Conclusion. OUES values peaked in association with an RER level of 1.0. Sub-maximal OUES values are not independent of exercise intensity. There is a significant increase in OUES value as exercise moves from low to moderate intensity. RER can be used as a secondary criterion to define this transition.

scholarly journals Acute administration of high doses of taurine does not substantially improve high-intensity running performance and the effect on maximal accumulated oxygen deficit is unclear

2016 ◽  
Vol 41 (5) ◽  
pp. 498-503 ◽  
Author(s):  
Fabio Milioni ◽  
Elvis de Souza Malta ◽  
Leandro George Spinola do Amaral Rocha ◽  
Camila Angélica Asahi Mesquita ◽  
Ellen Cristini de Freitas ◽  
...  
Keyword(s):  
Oxygen Uptake ◽  
Exercise Intensity ◽  
Maximal Oxygen Uptake ◽  
High Intensity ◽  
Treadmill Running ◽  
Oxygen Deficit ◽  
Time To Exhaustion ◽  
Acute Administration ◽  
Running Performance ◽  
Accumulated Oxygen Deficit

The aim of the present study was to investigate the effects of acute administration of taurine overload on time to exhaustion (TTE) of high-intensity running performance and alternative maximal accumulated oxygen deficit (MAODALT). The study design was a randomized, placebo-controlled, crossover design. Seventeen healthy male volunteers (age: 25 ± 6 years; maximal oxygen uptake: 50.5 ± 7.6 mL·kg−1·min−1) performed an incremental treadmill-running test until voluntary exhaustion to determine maximal oxygen uptake and exercise intensity at maximal oxygen uptake. Subsequently, participants completed randomly 2 bouts of supramaximal treadmill-running at 110% exercise intensity at maximal oxygen uptake until exhaustion (placebo (6 g dextrose) or taurine (6 g) supplementation), separated by 1 week. MAODALT was determined using a single supramaximal effort by summating the contribution of the phosphagen and glycolytic pathways. When comparing the results of the supramaximal trials (i.e., placebo and taurine conditions) no differences were observed for high-intensity running TTE (237.70 ± 66.00 and 277.30 ± 40.64 s; p = 0.44) and MAODALT (55.77 ± 8.22 and 55.06 ± 7.89 mL·kg−1; p = 0.61), which seem to indicate trivial and unclear differences using the magnitude-based inferences approach, respectively. In conclusion, acute 6 g taurine supplementation before exercise did not substantially improve high-intensity running performance and showed an unclear effect on MAODALT.

Physiological stress of basketball referees during a national competition

2021 ◽  
Vol 23 ◽  
Author(s):  
Ramiro Marques Inchauspe ◽  
Pablo Morales Barbian ◽  
Gregório Aguiar Lélis ◽  
Flávia Renata de Almeida ◽  
Alejandro Vaquera
Keyword(s):  
Heart Rate ◽  
Relative Intensity ◽  
Exercise Intensity ◽  
Training Programs ◽  
Physiological Stress ◽  
Relative Exercise Intensity ◽  
National Competition ◽  
Physiological Demands ◽  
Playing Time

abstract The aim of this study was to examine the physiological demands of seven referees during a national basketball competition. We recorded heart rate (HR), relative exercise intensity as a percentage of age – predicted maximum HR (HRmax), proportion of playing time within the exercise intensity categories defined by the ACSM during each of the tournament matches for each referee per period, as well as the entire game. None of the variables shows significant differences between periods. Based on a format of three referees per match, referees worked with an average HR of 150 bpm (range 110-181 bpm) for each quarter of the match, which equals a relative intensity> 70% of HRmax for most (∼76%) of each quarter. Other studies will assist in developing appropriate training programs for elite basketball referees to maintain and / or maximize performance.

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