EP1586353B1 - Verfahren und Vorrichtung zur Messung der Wirksamkeit einer Sportbewegung - Google Patents

Verfahren und Vorrichtung zur Messung der Wirksamkeit einer Sportbewegung Download PDF

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Publication number
EP1586353B1
EP1586353B1 EP20040405233 EP04405233A EP1586353B1 EP 1586353 B1 EP1586353 B1 EP 1586353B1 EP 20040405233 EP20040405233 EP 20040405233 EP 04405233 A EP04405233 A EP 04405233A EP 1586353 B1 EP1586353 B1 EP 1586353B1
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Prior art keywords
attribute
sportsperson
heart rate
effectiveness
reference population
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English (en)
French (fr)
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EP1586353A1 (de
Inventor
Emmanuel Onillon
Rolf Vetter
Jérôme Cornuz
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CSEM Centre Suisse dElectronique et de Microtechnique SA Recherche et Développement
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CSEM Centre Suisse dElectronique et de Microtechnique SA Recherche et Développement
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Priority to DE200460004243 priority Critical patent/DE602004004243D1/de
Priority to EP20040405233 priority patent/EP1586353B1/de
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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B69/00—Training appliances or apparatus for special sports
    • A63B69/0028—Training appliances or apparatus for special sports for running, jogging or speed-walking
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B69/00—Training appliances or apparatus for special sports
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2220/00—Measuring of physical parameters relating to sporting activity
    • A63B2220/40—Acceleration
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2230/00—Measuring physiological parameters of the user
    • A63B2230/04—Measuring physiological parameters of the user heartbeat characteristics, e.g. ECG, blood pressure modulations
    • A63B2230/06—Measuring physiological parameters of the user heartbeat characteristics, e.g. ECG, blood pressure modulations heartbeat rate only

Definitions

  • the invention relates to the field of physical activities. It relates more particularly to a method and a device for measuring the effectiveness of a sporting gesture.
  • the training aims to improve its efficiency, or efficiency, which can be defined by the ratio between the energy expended and the energy cost required by the movement and / or displacement. athlete.
  • Improving efficiency also means reducing the denominator of the ratio of "energy spent / energy cost”.
  • the problem lies mainly in material aspects of the sports equipment.
  • the energy cost of the movement goes through an improvement of the technical control of the gesture in question. Its effectiveness is directly linked to parameters that are difficult to quantify (orientation of the supports, relaxation of the antagonistic muscles in the working phases and agonist muscles in the rest phases, parasitic movements, etc.).
  • US-A-6397151 describes a method and a device for measuring the effectiveness of an athlete's gesture.
  • the present invention aims to allow an athlete to evaluate the effectiveness of his technique, without the need for an outside look.
  • the invention also provides, particularly for coaches, a rational means for quantifying the technical progress of the athlete.
  • the attribute A is the standard deviation of the signal supplied by the accelerometer.
  • stride is modeled through the center of gravity of the runner, which has a sinusoidal movement. Stride efficiency translates into consistent speed and minimized center of gravity acceleration in a vertical direction.
  • the athlete is equipped with a device according to the invention, comprising a heart rate measuring device or heart rate monitor 10 of known type as, for example, that marketed by the firm Polar®.
  • the measurement is done through a probe incorporated in a chest strap 12 disposed on the chest of the athlete. It transmits a signal received by a wristwatch 13 equipped to treat it and display the instantaneous heart rate, including as a percentage of the athlete's maximum heart rate.
  • the device according to the invention further comprises an accelerometer 14 integral with the runner's chest. It is, for example, attached to the belt 12 of the heart rate monitor.
  • the sensor used is of the ADXL 202E type marketed by the firm Analog Devices and provides a signal representative of the acceleration that the center of gravity of the runner undergoes in the three directions of space.
  • a processing circuit 15 receives the signal from the accelerometer 14 conveyed by transmission means, consisting of a transmitter 16a and a receiver 17 respectively associated with the accelerometer 14 and the processing circuit 15. To avoid any disturbance induced by a background noise or an artifact, the signal is corrected by a bandpass-type filter 18 before arriving at the processing circuit 15. The latter also receives from a transmitter 16b information from the heart rate monitor 10 instantaneous heart rate and percentage of maximum heart rate.
  • the circuit 15 processes this information so as to evaluate the effectiveness of the athlete's gesture, as will be described below.
  • the processing circuit 15 is housed in the watch 13 and the transmission means 16 and 17 are wireless.
  • the transmission frequencies of the signals of the heart rate sensor 10 and the accelerometer 14 are protected from each other to avoid any disturbance.
  • the device further comprises, placed at the output of the processing circuit 15, signaling means 19 to inform the athlete on the effectiveness of his gesture.
  • the signaling may be audible and the means 19 then consist of a loudspeaker also housed in the watch 13.
  • the attribute A extracted at 22 is the standard deviation of the acceleration signal of the torso delivered by the accelerometer 14. Every 5 seconds, this standard deviation is estimated on the basis of measurements made during the last 10 seconds.
  • the normalization 23 of the attribute A is necessary for the subsequent comparison. Since the frequency of the stride has a direct impact on the acceleration experienced by the torso of the runner, this normalization is performed with respect to this frequency, directly extracted from the signal supplied by the accelerometer 14, advantageously by the zero crossing method of the signal. Indeed, according to the sinusoidal modeling of the displacement of the center of gravity of the runner, there are two passages by zero of the signal in each of the periods.
  • the reference value used for the comparison operation 24, contained in the memory 21, is the average A ⁇ of the attribute, obtained for a reference population.
  • the effectiveness of the stride is not the same during a simple jog or competition. It is therefore necessary to compare the attributes of the subject and the reference runners at a similar intensity of effort.
  • the average A ⁇ of the attribute is stored in the memory, at the factory, for different values of a force parameter P i , which is a percentage of the maximum heart rate.
  • the attributes of the reference population are obtained by running its limbs at stable threshold intensities, typically 60%, 70%, 80%, 85% of their maximum heart rate. These percentages, given as an example, correspond to an audience of endurance runners.
  • the microprocessor 20 searches the memory 21 for the reference value A ⁇ corresponding to the percentage of the maximum heart rate indicated by the heart rate monitor 10. This value is either directly extracted from the memory if the percentage corresponds at a threshold intensity, is calculated by interpolation if the percentage is between two values of the parameter P i .
  • the comparison between the measured attribute A and its average reference value A ⁇ is advantageously performed, typically every five seconds, by means of the Mahalanobis formula. This allows, in the case where several attributes are taken into account in the comparison, to weight the calculation by the influence of each attribute according to its reliability. To do this, it involves a standardization by the covariance matrix of the average attributes of the reference population.
  • the difference d from the comparison 24 is an index of the effectiveness of the stride. It is transcribed at 25 by the signaling means 19. A correlation scale is stored for this purpose in the memory 21 to make the calculated index meaningful by associating a frequency of a signal with it. intermittent sound. Thus, for example, the larger the difference calculated using the Mahalanobis formula, the higher the frequency of the signal.
  • the index can also be displayed digitally on the screen of the watch 13.
  • the riders constituting the reference population were chosen according to their performances and the quality of their stride, judged by experts of the discipline according to the traditional criteria. A rider with a less academic style will not be included in this sampling, so as not to distort the reference values.
  • the device can also be adapted to other sports than running by changing the position of the accelerometer.
  • gymnasts may also use an apparatus according to the invention to study their rotation during acrobatics.
  • the use of a heart rate monitor and taking into account the intensity of the effort to perform the comparison are not mandatory.
  • the heart rate monitor implemented in the device can also operate on the basis of any other measurement system, such as, for example, an optical measurement described in EP 1 297 784 A1.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Claims (8)

  1. Verfahren zur Messung der Wirksamkeit der Bewegung eines Sportlers, das die folgenden Schritte aufweist:
    - Gewinnung (22) mindestens eines Attributs (A) des Signals, das von einem Beschleunigungsmesser (14) geliefert wird, der am Sportler angeordnet ist, um die mit dieser Bewegung verbundene Beschleunigung zu erfassen,
    - Vergleich (24) dieses Attributs mit dem für eine Bezugspopulation erhaltenen Mittelwert (A̅) des gleichen Attributs, der dem Prozentsatz der maximalen Herzfrequenz entspricht, der von einem vom Sportler getragenen Herzfrequenzmesser (10) geliefert wird und in einem Speicher (21) gespeichert ist, und
    - Erzeugung (25) einer Darstellung der Wirksamkeit der Bewegung.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Attribut (A) die typische Abweichung des vom Beschleunigungsmesser (14) gelieferten Signals ist.
  3. Verfahren nach Anspruch 2, das zur Messung der Wirksamkeit der Schrittlänge eines Läufers bestimmt ist, dadurch gekennzeichnet, dass das Attribut durch die Schrittfrequenz (23) standardisiert wird.
  4. Vorrichtung zur Messung der Wirksamkeit einer sportlichen Bewegung durch das Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass sie aufweist:
    - einen Beschleunigungsmesser (14), der an einem Sportler angeordnet ist, um ein für die Bewegung repräsentatives Signal zu liefern,
    - ein Messgerät für die Herzfrequenz (10), das dazu bestimmt ist, an die Verarbeitungsschaltung (15) Informationen bezüglich der Herzfrequenz des Sportlers zu liefern,
    - eine Verarbeitungsschaltung (15), die mit einem Mikroprozessor (20) und mit einem das Signal empfangenden Speicher (21) versehen ist, wobei der Mikroprozessor (20) programmiert ist, um in bestimmten Intervallen die folgenden Vorgänge durchzuführen:
    • Gewinnung (22) mindestens eines Attributs (A) des Signals des Beschleunigungsmessers,
    • Vergleich (24) dieses Attributs (A) mit dem für eine Bezugspopulation erhaltenen Mittelwert (A̅) des gleichen Attributs, der dem Prozentsatz der maximalen Herzfrequenz entspricht, der von einem vom Sportler getragenen Herzfrequenzmesser (10) geliefert wird und in einem Speicher (21) gespeichert ist, und
    • Erzeugung (25) einer Darstellung der Wirksamkeit der Bewegung, und
    - Anzeigemittel (19), um die Darstellung zum Sportler zu übertragen.
  5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Verarbeitungsschaltung programmiert ist, um den Vergleich gemäß der folgenden Gleichung durchzuführen: d fc = θ → - μ → ref T ⁢ x  ⁢ C fc  x ( θ → - μ → ref )
    Figure imgb0013
    in der:
    - d(fc) die Abweichung zwischen dem Läufer und der Bezugspopulation für einen gegebenen Prozentsatz fc der maximalen Herzfrequenz ist,
    - θ →
    Figure imgb0014
     der Wert des für den Läufer bestimmten Attributs, oder im allgemeinen Fall ein Vektor ist, dessen Komponenten die verschiedenen für diesen letzteren gemessenen Attribute sind,
    - μ → ref
    Figure imgb0015
     der Mittelwert des für die Bezugspopulation bestimmten Attributs, oder im allgemeinen Fall der Vektor ist, dessen Komponenten die Mittelwerte der Attribute für die Bezugspopulation sind,
    - Cfc die Kovarianzmatrix der Mittelwerte der Attribute der Bezugspopulation ist, und
  6. Vorrichtung nach einem der Ansprüche 4 und 5, dadurch gekennzeichnet, dass die Verarbeitungsschaltung (15) in einer Uhr (13) untergebracht ist, die vom Sportler getragen wird.
  7. Vorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass die Anzeigemittel (19) in der Uhr (13) angeordnet sind.
  8. Vorrichtung nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass die Anzeigemittel (19) akustische Mittel und so ausgelegt sind, dass sie einen intermittierenden Ton erzeugen, dessen Frequenz mit der Darstellung gekoppelt ist.
EP20040405233 2004-04-15 2004-04-15 Verfahren und Vorrichtung zur Messung der Wirksamkeit einer Sportbewegung Expired - Lifetime EP1586353B1 (de)

Priority Applications (2)

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DE200460004243 DE602004004243D1 (de) 2004-04-15 2004-04-15 Verfahren und Vorrichtung zur Messung der Wirksamkeit einer Sportbewegung
EP20040405233 EP1586353B1 (de) 2004-04-15 2004-04-15 Verfahren und Vorrichtung zur Messung der Wirksamkeit einer Sportbewegung

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US7237446B2 (en) * 2005-09-16 2007-07-03 Raymond Chan System and method for measuring gait kinematics information
EP2229880A1 (de) 2009-03-18 2010-09-22 CSEM Centre Suisse d'Electronique et de Microtechnique SA Stirnbandintegrierte Überwachungseinheit mit einem Beschleunigungsmesser
US10216893B2 (en) 2010-09-30 2019-02-26 Fitbit, Inc. Multimode sensor devices
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