Biomechanist, neuroscientist, and software developer. Researcher of balance and proprioception. Founder of http://www.balancetrackingsystems.com . Phone: 619-594-7272 Address: San Diego State University
School of Exercise and Nutritional Sciences
5500 Campanile Drive
San Diego, CA
92182-7251
Abstract Upper limb asymmetries in motor behavior are thought to be one of the most obvious examp... more Abstract Upper limb asymmetries in motor behavior are thought to be one of the most obvious examples of lateralized brain function. This phenomenon, more generally known as ?handedness?, has traditionally been approached from the standpoint of motor output, ...
Falls are the leading cause of mortality and chronic disability in elderly adults. There are effe... more Falls are the leading cause of mortality and chronic disability in elderly adults. There are effective fall prevention interventions available. But only a fraction of the individuals with balance/dizziness problems are seeking timely help from the healthcare system. Current literature confirms the underutilization of healthcare services for the management of balance problems in adults, especially older adults. This review article explores factors associated with healthcare utilization as guided by the Andersen Healthcare Utilization Model, a framework frequently used to explore the factors leading to the use of health services. Age, sex, race/ethnicity, BMI, and comorbidities have been identified as some of the potential predisposing factors; socioeconomic status, health insurance, and access to primary care are the enabling and disabling factors; and severity of balance problem, perceived illness, and its impact on daily activities are the factors affecting need for care associated...
Compression socks are used by a very diverse group of individuals and may potentially have a grea... more Compression socks are used by a very diverse group of individuals and may potentially have a greater impact on physically diminished or impaired individuals as opposed to healthy individuals. The purpose of this study was to compare the effects of sub-clinical (SC) and clinical (CL) compression socks among healthy (CON), copers (COP), and individuals with chronic ankle instability (CAI). Postural stability was evaluated in 20 participants (11 males and 9 females) using Balance Tracking System Balance platform (BTrackS™) during the modified clinical test of sensory integration in balance (mCTSIB) and limits of stability (LOS) tests. Postural sway parameters were analyzed using a mixed model repeated measures analysis of variance 3 (group: CON, COP, and CAI) by 3 (compression condition: BF, SC, and CL) × 4 (balance condition: EO, EC, EOF, and ECF) for mCTSIB and a 3 (group: CON, COP, and CAI) by 3 (compression condition: BF, SC, CL) × 4 (balance condition: FL, BL, BR, FR) for LOS. Res...
This study aimed to characterize the risk of falling in low-, moderate- and high-risk participant... more This study aimed to characterize the risk of falling in low-, moderate- and high-risk participants from two different geographical locations using a portable force-plate. A sample of 390 older adults from South and North America were matched for age, sex, height and weight. All participants performed a standardized balance assessment using a force plate. Participants were classified in low, moderate and high risk of falling. No differences were observed between South and North American men, nor comparing North American men and women. South American women showed the significantly shorter center of pressure path length compared to other groups. The majority of the sample was categorized as having low risk of falling (male: 65.69% and female: 61.87%), with no differences between men and women. Moreover, no differences were found between North vs. South Americans, nor between male and female groups compared separately. In conclusion, South American women had better balance compatible wi...
Research has shown that psychedelics, such as lysergic acid diethylamide (LSD), have profound ant... more Research has shown that psychedelics, such as lysergic acid diethylamide (LSD), have profound anti-inflammatory properties mediated by 5-HT2A receptor signaling, supporting their evaluation as a therapeutic for neuroinflammation associated with neurodegenerative disease. Objective This study evaluated the safety, tolerability, pharmacokinetics, and pharmacodynamics of orally repeated administration of 5 μg, 10 μg, and 20 μg LSD in older healthy individuals. In the current paper, we present safety, tolerability, pharmacokinetics, and pharmacodynamic measures that relate to safety, tolerability, and dose response. Methods This was a phase 1 double-blind, placebo-controlled, randomized study. Volunteers were randomly assigned to 1 of 4 dose groups (5 μg, 10 μg, 20 μg LSD, and placebo), and received their assigned dose on six occasions (i.e., every 4 days). Results Forty-eight older healthy volunteers (mean age = 62.9 years) received placebo (n = 12), 5 μg (n = 12), 10 μg (n = 12), or 2...
ow naded rom httpsournals.lw w om /om ehealthenurseonline by hD M fePH KazEoum tQ fN 4a+khEZgbsIH... more ow naded rom httpsournals.lw w om /om ehealthenurseonline by hD M fePH KazEoum tQ fN 4a+khEZgbsIH o4XM hC yw C X1AW YQ /IlQ rH D 3tdU 4D sBzQ 2+sQ 2N eD b09C gH 4qoN VuIJJEN 40ID W 65e6O cH vg== on 116/2019 Downloadedfromhttps://journals.lww.com/homehealthcarenurseonlinebyBhDMf5ePHKav1zEoum1tQfN4a+kJLhEZgbsIHo4XMi0hCywCX1AWnYQp/IlQrHD3ctdU4DsFBzQ2+sQ2NkeDb09CgH4qoNVu7IJJEN4g0IDW6k5e6OcHvg==on11/06/2019 FOCUS ON THERAPY
Changes in postural sway measured via force plate center of pressure have been associated with ma... more Changes in postural sway measured via force plate center of pressure have been associated with many aspects of human motor ability. A previous study validated the accuracy and precision of a relatively new, low-cost and portable force plate called the Balance Tracking System (BTrackS). This work compared a laboratory-grade force plate versus BTrackS during human-like dynamic sway conditions generated by an inverted pendulum device. The present study sought to extend previous validation attempts for BTrackS using a more traditional point of application (POA) approach. Computer numerical control (CNC) guided application of ∼155 N of force was applied five times to each of 21 points on five different BTrackS Balance Plate (BBP) devices with a hex-nose plunger. Results showed excellent agreement (ICC > 0.999) between the POAs and measured COP by the BBP devices, as well as high accuracy (<1% average percent error) and precision (<0.1 cm average standard deviation of residuals)....
Clinical journal of sport medicine : official journal of the Canadian Academy of Sport Medicine, Jan 27, 2017
Recent guidelines advocate for ongoing balance testing in the assessment of management of concuss... more Recent guidelines advocate for ongoing balance testing in the assessment of management of concussion injuries. This study sought to determine whether the Balance Tracking System (BTrackS) provides stable balance results over repeated administration and, thus, is a reliable tool for concussion management. Repeated measures and test-retest reliability. University Biomechanics Laboratory. Random sample of 20 healthy young adults. Force plate balance testing using BTrackS on days 1, 3, 8, and 15. Practice-induced changes in the average center of pressure excursion over 4 repeated administrations of the BTrackS Balance Test (BBT). Test-retest reliability of center of pressure excursion from day 1 to day 15. No significant practice-induced balance differences were found across testing days (P > 0.4), and test-retest reliability of the BBT was excellent from day 1 to day 15 (R 0.92). These findings indicate that the BBT does not elicit a practice effect over repeat administrations. BTra...
Abstract Upper limb asymmetries in motor behavior are thought to be one of the most obvious examp... more Abstract Upper limb asymmetries in motor behavior are thought to be one of the most obvious examples of lateralized brain function. This phenomenon, more generally known as ?handedness?, has traditionally been approached from the standpoint of motor output, ...
Falls are the leading cause of mortality and chronic disability in elderly adults. There are effe... more Falls are the leading cause of mortality and chronic disability in elderly adults. There are effective fall prevention interventions available. But only a fraction of the individuals with balance/dizziness problems are seeking timely help from the healthcare system. Current literature confirms the underutilization of healthcare services for the management of balance problems in adults, especially older adults. This review article explores factors associated with healthcare utilization as guided by the Andersen Healthcare Utilization Model, a framework frequently used to explore the factors leading to the use of health services. Age, sex, race/ethnicity, BMI, and comorbidities have been identified as some of the potential predisposing factors; socioeconomic status, health insurance, and access to primary care are the enabling and disabling factors; and severity of balance problem, perceived illness, and its impact on daily activities are the factors affecting need for care associated...
Compression socks are used by a very diverse group of individuals and may potentially have a grea... more Compression socks are used by a very diverse group of individuals and may potentially have a greater impact on physically diminished or impaired individuals as opposed to healthy individuals. The purpose of this study was to compare the effects of sub-clinical (SC) and clinical (CL) compression socks among healthy (CON), copers (COP), and individuals with chronic ankle instability (CAI). Postural stability was evaluated in 20 participants (11 males and 9 females) using Balance Tracking System Balance platform (BTrackS™) during the modified clinical test of sensory integration in balance (mCTSIB) and limits of stability (LOS) tests. Postural sway parameters were analyzed using a mixed model repeated measures analysis of variance 3 (group: CON, COP, and CAI) by 3 (compression condition: BF, SC, and CL) × 4 (balance condition: EO, EC, EOF, and ECF) for mCTSIB and a 3 (group: CON, COP, and CAI) by 3 (compression condition: BF, SC, CL) × 4 (balance condition: FL, BL, BR, FR) for LOS. Res...
This study aimed to characterize the risk of falling in low-, moderate- and high-risk participant... more This study aimed to characterize the risk of falling in low-, moderate- and high-risk participants from two different geographical locations using a portable force-plate. A sample of 390 older adults from South and North America were matched for age, sex, height and weight. All participants performed a standardized balance assessment using a force plate. Participants were classified in low, moderate and high risk of falling. No differences were observed between South and North American men, nor comparing North American men and women. South American women showed the significantly shorter center of pressure path length compared to other groups. The majority of the sample was categorized as having low risk of falling (male: 65.69% and female: 61.87%), with no differences between men and women. Moreover, no differences were found between North vs. South Americans, nor between male and female groups compared separately. In conclusion, South American women had better balance compatible wi...
Research has shown that psychedelics, such as lysergic acid diethylamide (LSD), have profound ant... more Research has shown that psychedelics, such as lysergic acid diethylamide (LSD), have profound anti-inflammatory properties mediated by 5-HT2A receptor signaling, supporting their evaluation as a therapeutic for neuroinflammation associated with neurodegenerative disease. Objective This study evaluated the safety, tolerability, pharmacokinetics, and pharmacodynamics of orally repeated administration of 5 μg, 10 μg, and 20 μg LSD in older healthy individuals. In the current paper, we present safety, tolerability, pharmacokinetics, and pharmacodynamic measures that relate to safety, tolerability, and dose response. Methods This was a phase 1 double-blind, placebo-controlled, randomized study. Volunteers were randomly assigned to 1 of 4 dose groups (5 μg, 10 μg, 20 μg LSD, and placebo), and received their assigned dose on six occasions (i.e., every 4 days). Results Forty-eight older healthy volunteers (mean age = 62.9 years) received placebo (n = 12), 5 μg (n = 12), 10 μg (n = 12), or 2...
ow naded rom httpsournals.lw w om /om ehealthenurseonline by hD M fePH KazEoum tQ fN 4a+khEZgbsIH... more ow naded rom httpsournals.lw w om /om ehealthenurseonline by hD M fePH KazEoum tQ fN 4a+khEZgbsIH o4XM hC yw C X1AW YQ /IlQ rH D 3tdU 4D sBzQ 2+sQ 2N eD b09C gH 4qoN VuIJJEN 40ID W 65e6O cH vg== on 116/2019 Downloadedfromhttps://journals.lww.com/homehealthcarenurseonlinebyBhDMf5ePHKav1zEoum1tQfN4a+kJLhEZgbsIHo4XMi0hCywCX1AWnYQp/IlQrHD3ctdU4DsFBzQ2+sQ2NkeDb09CgH4qoNVu7IJJEN4g0IDW6k5e6OcHvg==on11/06/2019 FOCUS ON THERAPY
Changes in postural sway measured via force plate center of pressure have been associated with ma... more Changes in postural sway measured via force plate center of pressure have been associated with many aspects of human motor ability. A previous study validated the accuracy and precision of a relatively new, low-cost and portable force plate called the Balance Tracking System (BTrackS). This work compared a laboratory-grade force plate versus BTrackS during human-like dynamic sway conditions generated by an inverted pendulum device. The present study sought to extend previous validation attempts for BTrackS using a more traditional point of application (POA) approach. Computer numerical control (CNC) guided application of ∼155 N of force was applied five times to each of 21 points on five different BTrackS Balance Plate (BBP) devices with a hex-nose plunger. Results showed excellent agreement (ICC > 0.999) between the POAs and measured COP by the BBP devices, as well as high accuracy (<1% average percent error) and precision (<0.1 cm average standard deviation of residuals)....
Clinical journal of sport medicine : official journal of the Canadian Academy of Sport Medicine, Jan 27, 2017
Recent guidelines advocate for ongoing balance testing in the assessment of management of concuss... more Recent guidelines advocate for ongoing balance testing in the assessment of management of concussion injuries. This study sought to determine whether the Balance Tracking System (BTrackS) provides stable balance results over repeated administration and, thus, is a reliable tool for concussion management. Repeated measures and test-retest reliability. University Biomechanics Laboratory. Random sample of 20 healthy young adults. Force plate balance testing using BTrackS on days 1, 3, 8, and 15. Practice-induced changes in the average center of pressure excursion over 4 repeated administrations of the BTrackS Balance Test (BBT). Test-retest reliability of center of pressure excursion from day 1 to day 15. No significant practice-induced balance differences were found across testing days (P > 0.4), and test-retest reliability of the BBT was excellent from day 1 to day 15 (R 0.92). These findings indicate that the BBT does not elicit a practice effect over repeat administrations. BTra...
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