SYSTEMS AND METHODS OF POWER OUTPUT MEASUREMENT
The present invention pertains to systems and methods of individual power output measurement. One embodiment relates to a pressure sensing device configured to be mounted on the bottom surface of a shoe. The device includes a sensor, a wireless communication system, a housing, and a mounting system. A second embodiment relates to a direct power measurement system including a pressure sensing device, a computer module, and a display module. In a bicycling application of the system, the device is mounted on the bottom surface of a shoe so as to measure applied pressure between at least one of the rider's shoe and corresponding bicycle pedal. The computing module mathematically converts the measured pressure as a function of time to a value of power exerted by the rider. In addition, the computing module may utilize the measured pressure as a function of time to compute the rider's cadence (pedal revolutions per unit of time). Various well-known communication systems such as RF may be integrated within the device and computing module to facilitate data transmission. Similar systems may be used to calculate an individual's power output during other activities including but not limited to running, rowing, walking, etc. A third embodiment relates to a method for calculating individual power output during an athletic activity. The method includes sensing pressure at a particular location, calculating or computing power, and displaying power.
This application claims priority to U.S. provisional application Ser. No. 60/678,887 filed May 6, 2005.
BACKGROUND1. Field of the Invention
The present invention relates to systems and methods of power output measurement. In particular the present invention relates to a power measurement device.
2. Background of the Invention and Related Art
Endurance athletes utilize various metrics to measure their performance and chart their workouts. These metrics are recorded and analyzed both during and after workouts. For example, interval type workouts typically involve multiple sets of intense activity, semi-intense activity, and rest. The intense activity may be characterized by a range of metrics which correlate to the desired intensity for a particular athlete. Likewise, the rest or semi-intense activity periods may be characterized by a range or metrics which correlate to the desired restful state for a particular athlete. One common form of metric measurement includes an athlete's heart rate. An athlete can utilize specific heart rate ranges to obtain desired intensity or restful states. Various well known methodologies exist for analyzing heart rate including the use of VO2max, maximum heart rate, age, etc. However, it has been determined that heart rate alone is not necessarily an accurate assessment of the amount of work an individual is exerting at any given time. For example, as an athlete improves or increases fitness, his/her max heart rate may increase while relative working heart rate for a particular activity may remain constant. In this case, conventional heart rate measurement will not accurately identify an athlete's increased performance. Therefore, it is necessary to utilize other metric measurements or combinations of metrics to accurately measure an athlete's work load during a particular activity.
One particularly useful metric measurement involves calculating the amount of power or work an athlete is generating as a function of time. An increase in power output directly translates to an increased athletic performance. Likewise, a decrease in power output translates to a decreased athletic performance. The measurement of instantaneous power has become popular for certain activities, including cycling. Power output has been determined to be a more accurate measurement of an athlete's performance and is therefore a more useful metric for analysis and improvement.
Unfortunately, it is difficult to accurately measure an athlete's power output. Power is a function of force, and many sports involve the application of force in a variety of directions. In addition, few athletes are willing to wear or equip heavy force measurement devices. In cycling, well known existing devices have attempted to calculate power output as a function of pedal cadence. This measurement scheme is inherently inaccurate because the power necessary to pedal at a particular cadence depends tremendously upon the surface over which the bicycle is traveling. For example, a steep hill requires more power per pedal stroke than a flat or downhill grade. Likewise, systems that attempt to extrapolate power measurements from heart rate are inherently flawed because they do not account for the increased power output that often accompanies an increase in fitness.
Accordingly, there is a need in the industry for an efficient and accurate system of power output measurement.
SUMMARY OF THE INVENTIONThe present invention pertains to systems and methods of individual power output measurement. One embodiment relates to a pressure sensing device configured to be mounted on the bottom surface of a shoe. The device includes a sensor, a wireless communication system, a housing, and a mounting system. A second embodiment relates to a direct power measurement system including a pressure sensing device, a computer module, and a display module. In a bicycling application of the system, the device is mounted on the bottom surface of a shoe so as to measure applied pressure between at least one of the rider's shoe and corresponding bicycle pedal. The computing module mathematically converts the measured pressure as a function of time to a value of power exerted by the rider. In addition, the computing module may utilize the measured pressure as a function of time to compute the rider's cadence (pedal revolutions per unit of time). Various well-known communication systems such as RF may be integrated within the device and computing module to facilitate data transmission. Similar systems may be used to calculate an individual's power output during other activities including but not limited to running, rowing, walking, etc. A third embodiment relates to a method for calculating individual power output during an athletic activity. The method includes sensing pressure at a particular location, calculating or computing power, and displaying power.
These and other features and advantages of the present invention will be set forth or will become more fully apparent in the description that follows and in the appended claims. The features and advantages may be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims. Furthermore, the features and advantages of the invention may be learned by the practice of the invention or will be obvious from the description, as set forth hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGSIn order that the manner in which the above-recited and other advantages and features of the invention are obtained, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:
The present invention pertains to systems and methods of individual power output measurement. One embodiment relates to a pressure sensing device configured to be mounted on the bottom surface of a shoe. The device includes a sensor, a wireless communication system, a housing, and a mounting system. A second embodiment relates to a direct power measurement system including a pressure sensing device, a computer module, and a display module. In a bicycling application of the system, the device is mounted on the bottom surface of a shoe so as to measure applied pressure between at least one of the rider's shoe and corresponding bicycle pedal. The computing module mathematically converts the measured pressure as a function of time to a value of power exerted by the rider. In addition, the computing module may utilize the measured pressure as a function of time to compute the rider's cadence (pedal revolutions per unit of time). Various well-known communication systems such as RF may be integrated within the device and computing module to facilitate data transmission. Similar systems may be used to calculate an individual's power output during other activities including but not limited to running, rowing, walking, etc. A third embodiment relates to a method for calculating individual power output during an athletic activity. The method includes sensing pressure at a particular location, calculating or computing power, and displaying power. While embodiments of the present invention are directed at systems and methods of power output measurement, it will be appreciated that the teachings of the present invention are applicable to other areas.
The following terms are defined as follows:
Metric—A numerical value relating to a particular measurement. For example, speed, heart rate, power output, cadence, stroke, etc.
Pressure Sensor—A device configured to measure the amount of applied pressure at a particular point or area, wherein the measured pressure is converted into an electrical data signal.
Shoe—An article that covers a user's foot and possibly a portion of a user's lower leg. A shoe may be composed of both flexible and rigid materials and combinations thereof. A shoe may be designed to achieve specific performance characteristics consistent with a particular sport. For example, a cycling shoe is generally rigid so as to maximize force transfer between a rider and a bicycle.
Wireless communication system—Any system capable of transmitting data wirelessly between two or more points. For example, a radio transmitter may be used to convert and transmit electrical signals across a radio frequency to a radio receiver.
Mounting system—An attachment system for mechanically coupling one item to another. For example, a mounting system is used in accordance with embodiments of the present invention to couple a pressure sensing device to a user and/or an athletic article.
Reference is initially made to
The housing 120 is configured to protect portions of the device that may otherwise be damaged by exposure or incidental contacts. The illustrated housing 120 includes an enclosure 124, a cap 122, an o-ring 128, and a cover 126. The enclosure 124 provides a cavity in which portions of the wireless communication system 190 may be housed. In addition, the enclosure 124 and the cap 122 facilitate portions of the mounting system 180 that allow the device 100 to be coupled to articles for use in measuring particular pressure values. The o-ring 128 and cover 126 are positioned to cover and seal a back opening of the enclosure 124. The back opening of the enclosure, allows for access and assembly of the printed circuit board 194.
The illustrated mounting system 180 includes two attachment members 182 configured to extend through a portion of the housing 120 for the purpose of attaching the device to an article (not shown). In addition, the mounting system 180 includes three other attachment members 184 (illustrated in
The wireless communication system 190 is electrically coupled to the sensor 110 via the electrical coupler 102. The wireless communication system 190 is configured to wireless transmit data corresponding to the pressure applied upon the sensor 110. The illustrated wireless communication system 190 further includes a printed circuit board 194 and a power supply 192. The power supply may include batteries that are configured to be rechargeable without removal from the device 100. The printed circuit board 194 includes various electrical components including but not limited to a transmitter, an antenna, a processor, a DC converter, etc. The printed circuit board 194 may further include a microprocessor that performs one or more mathematical computations on the measured pressure such as a mathematical conversion to measure power. The printed circuit board 194 further includes a coupler for facilitating the electrical coupling with the sensor 110. The transmitter may be configured to transmit the data utilizing any wireless data medium including but not limited to radio frequency, microwave, magnetic coupling, infrared, etc. In addition, the printed circuit board 194 is shaped to conform to the internal dimensions of the housing 124 and to facilitate the electrical coupling with the sensor 110. In addition, the power supply 192 and corresponding circuitry on the printed circuit board 194 are arranged in a manner that will also conform to the internal dimensions of the housing 124.
One embodiment of the electrical operation of the pressure sensing device 100 and accompanying power measurement system (not illustrated) is described for demonstrative purposes. The sensor 110 is powered by a constant current source such as the power supply 192. In response to pressure, the sensor 110 produces a time varying voltage that is amplified by a standard op-amp amplifier. An output voltage from the sensor 110 is split into three streams that are eventually transmitted to a microcontroller. The first stream computes RMS, the second stream produces a pulse stream that is proportional to the frequency of the output voltage, and the third stream is directly transmitted to the microcontroller. The microcontroller samples the three streams every 1/10 of a second and counts the number of pulses that occur every second after a sensed pressure. This data is then buffered as 10 bit data and wirelessly transmitted using a Zigbee™ RF standard. A receiver module may receive the signal and display the data on an LCD display screen. The receiver module may also be configured to receive multiple signals from a plurality of pressure sensing devices. Likewise, the wireless components may form a mesh network that allow for various devices to interface with one another. In addition, the receiver module may be equipped with a USB microcontroller to facilitate directly interfacing and transmitting data to a personal computer. Various other electrical configurations may be utilized in accordance with the present invention.
Reference is next made to
Reference is next made to
Reference is next made to
A further embodiment (not illustrated) refers to a method of dynamically bracketing a metric during an athletic activity. An athlete who is performing an athletic activity may often wish to hold a metric within a particular range so as to maximize performance. However, this range may not be quantifiable before or after the athletic activity. Therefore, it is necessary to dynamically bracket the metric during the athletic activity. The method includes continuously monitoring at least one metric associated with the athlete's athletic performance or exertion level. For example, heart rate and power output may be continuously monitored and displayed to the athlete. Upon recognition of a useful situation, the athlete makes a bracket request to a computer module. The method then assigns a bracket or set of metric values corresponding to a set of values substantially centered around the measure metric value at the particular time at which the bracket request was received. Various well known electrical systems and methods may be employed in the execution of this method in accordance with the present invention.
Thus, as discussed herein, the embodiments of the present invention relate to a system of power output measurement. The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. All changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims
1. An athletic activity pressure sensing device comprising:
- a pressure sensor disposed in a particular location to receive pressure during an athletic activity, wherein the particular location is related to the athletic activity, and wherein the pressure sensor is configured to convert received pressure into electrical data;
- a wireless communication system electrically coupled to the pressure sensor and configured to wirelessly transmit the electrical data;
- a housing substantially enclosing the wireless communication system while facilitating the electrical coupling between the pressure sensor and the wireless communication system; and
- a mounting system configured to mechanically couple the athletic activity pressure sensing device to an athletic article in a manner that facilitates the disposal of the pressure sensor at the particular location.
2. The device of claim 1, wherein the pressure sensor further includes a top housing, a sensor plate, a bottom housing, and an electrical coupler, and wherein the top housing, sensor plate, and bottom housing include a plurality of holes to facilitate a portion of the mounting system.
3. The device of claim 1 further including a power supply that provides electrical power to at least one of the pressure sensor and the wireless communication system.
4. The device of claim 1, wherein the athletic activity is cycling, the athletic article is a shoe, and the particular location is between the athletic article and a pedal of a corresponding bicycle.
5. The device of claim 1, wherein the athletic article is coupled to a portion of a user's body that is primarily utilized in the performance of the athletic activity.
6. The device of claim 1, wherein the wireless communication system is disposed on a printed circuit board mechanically coupled and housed within the housing, and wherein the wireless communication system includes a power supply.
7. A system for measuring athletic power output during an athletic activity comprising:
- a pressure sensing device configured to measure pressure at a particular location, wherein the particular location is related to the athletic activity, and wherein the pressure sensing device converts the measured pressure into data and wirelessly transmits the data;
- a computing module configured to wirelessly receive the data and mathematically convert the data into a value of power output according to a specific algorithm; and
- a display module configured to display the power output value, wherein the display module is disposed in a second location that allows a user to view the display during the athletic activity.
8. The system of claim 7, wherein the pressure sensing device is mechanically coupled to an athletic article that is coupled to a portion of a user's body that is primarily utilized in the performance of the athletic activity.
9. The system of claim 7, wherein the pressure sensing device comprises:
- a pressure sensor disposed in a particular location to receive pressure during the athletic activity, wherein the particular location is related to the athletic activity, and wherein the pressure sensor is configured to convert received pressure into electrical data;
- a wireless communication system electrically coupled to the pressure sensor and configured to wirelessly transmit the electrical data;
- a housing substantially enclosing the wireless communication system while facilitating the electrical coupling between the pressure sensor and the wireless communication system; and
- a mounting system configured to mechanically couple the pressure sensing device to an athletic article in a manner that facilitates the disposal of the pressure sensor at the particular location.
10. The method of claim 7, wherein the computing module is housed within the pressure sensing device so as to directly calculate power output at the particular location.
11. The method of claim 7, wherein the athletic activity is cycling, the particular location is between a shoe and a pedal of a corresponding bicycle, and the second location is on the handlebars of the bicycle.
12. The method of claim 7, wherein the computer module further includes a wireless receiver, a power supply, and a processor.
13. The method of claim 7, wherein the computer module and display module are housed as a single unit.
14. A method for calculating individual power output during an athletic activity comprising the acts of:
- sensing pressure at a particular location, wherein the particular location is related to the athletic activity;
- computing power as a function of time through the application of a particular mathematical algorithm; and
- displaying power to a user in a manner that allows the user to view the power while performing the athletic activity.
15. The method of claim 14, wherein the act of sensing pressure at a particular location further includes the acts of:
- receiving a force at the particular location;
- measuring the received force;
- converting the measured force into electrical data; and
- transmitting the electrical data.
16. The method of claim 14, wherein the act of computing power as a function of time through the application of a particular mathematical algorithm further includes the acts of:
- receiving data corresponding to the sensed pressure; and
- calculating power as a function of time.
17. The method of claim 16, wherein the act of calculating power is performed continuously so as to continuously update the computed power.
18. The method of claim 14, wherein the athletic activity is cycling, the particular location is between the athletic article and a pedal of a corresponding bicycle, and the power is displayed on an appropriately accessible area of the corresponding bicycle.
19. A method of dynamically bracketing a metric during an athletic activity comprising the acts of:
- providing a user performing an athletic activity that affects at least one of heart rate, power output, muscle fatigue, and body heat;
- continuously measuring a metric during the performance of the athletic activity, wherein the metric is associated with at least one of the performance level of the user at the athletic activity and the exertion level of the user;
- receiving a bracket request from the user at a particular time during the performance of the athletic activity;
- assigning a bracket of metric values corresponding to a set of values substantially centered around the measured metric value at the particular time at which the bracket request was received.
20. The method of claim 11, wherein the metric is heart rate.
21. The method of claim 11, wherein the metric is power output.
22. The method of claim 11 further includes the act of alerting the user if the user falls outside of the assigned bracket of metric values.
Type: Application
Filed: May 1, 2006
Publication Date: Nov 9, 2006
Inventors: Roland Wyatt (Albany, CA), Dylan Seguin (Berkeley, CA), Richard Knapp (Sebastopol, CA)
Application Number: 11/380,945
International Classification: G01L 5/04 (20060101);