Standing Position Research Articles

The effect of squats on muscle activity in standing, kneeling, and half-kneeling positions: A cross-sectional study.

Kneeling and half-kneeling training are common positions used in physical therapy. however, research on lower extremity muscle activity is lacking compared to the ergonomic aspects and trunk muscle activity. The purpose of this study is to investigate the effects on lower extremity muscle activity during squats in kneeling and half-kneeling positions. The study was designed as a cross-sectional study with a single group of healthy adults. Participants were instructed to perform squats while assuming 3 positions (standing, kneeling, and half-kneeling). Surface electromyography data were recorded 3 times from the rectus femoris (RF), gluteus maximus (GMax), gluteus medius (GMed), and biceps femoris (BF) on the participant's dominant side, and the mean values were analyzed. The participants performed squats for 9 seconds, with 4 seconds of the descent phase, 1 second of the maintenance phase, and 4 seconds of the ascent phase. A metronome was used to ensure precise timing. The study included 30 participants (19 males and 11 females). The muscle activities of the RF, GMed, and BF showed statistically significant differences among the 3 positions, being highest in the half-kneeling position (HKP), followed by the standing position (SP) and kneeling position (KP). The muscle activity of the GMax was significantly higher in the HKP than in the SP and KP (P < .05). The co-contraction ratio was significantly higher with KP than with the SP and HKP (P < .05). In the SP and KP, there were statistically significant differences between the ascent and descent phases of the RF, GMax, GMed, and BF (P < .05). In the HKP, there were statistically significant differences between the ascent and descent phases of the RF, GMax, and GMed (P < .05). The results of this study indicate that squats in the HKP (especially during the ascent phase) require the highest muscle activity, whereas squats in the KP (especially during the descent phase) can be performed with the lowest muscle activity. It can be concluded that these findings could serve as selective indicators for squat exercises and in enhancing postural control, muscle strength, and lower extremity stabilization.

The immediate Effects of Flexi-bar Exercise on Plantar Pressure and Center of Pressure in Standing Position

The immediate Effects of Flexi-bar Exercise on Plantar Pressure and Center of Pressure in Standing Position

Comparative Analysis of Bilateral Deficits in Elbow Flexion Strength: Functional vs. Analytical Assessment

Background: this study aimed to identify the influence of postural stability on upper-limb bilateral deficit (BLD), and to compare the assessment of strength generated during elbow flexion functionally vs. analytically in the dominant and nondominant arms. Methods: Twenty men participated in two sessions to evaluate the maximum isometric strength of elbow flexion. This evaluation was performed unilaterally with the dominant arm, unilaterally with the non-dominant arm, and bilaterally, both in the sitting position (SiP) and the standing position (StP). Results: The BLD when peak force was considered was lower for StP (−6.44 ± 5.58%) compared to SiP (−10.73 ± 6.17%) (p = 0.007). Regarding peak force, statistically significant differences were observed for comparisons between dominance (p &lt; 0.001) and Position*Dominance (p = 0.02), but mean force differences were only observed for the dominance factor (p &lt; 0.001). Greater mean and peak forces were always produced bilaterally compared to unilaterally (p &lt; 0.001). Conclusions: a decrease in postural stability by performing elbow flexion exercises in a standing position accentuates BLD of peak force.

Intraocular Pressure Measurements in Standing, Sitting, Prone, and Supine Positions.

In this study, intraocular pressure (IOP) was measured in sitting, supine, prone, and standing (ST) positions and again five minutes after standing (ST-5) utilizing a Tono-Pen AVIA in 124 eyes of 62 healthy subjects with ages ranging from 21 to 59 years (mean 30 ± 10 years). In each subject, the average IOP of both eyes was used for the statistical evaluation. The mean IOP difference between the ST and sitting positions was -0.13 ± 1.63 mmHg (p = 0.548); between ST-5 and sitting, it was 0.53 ± 1.24 mmHg (p = 0.001); between supine and sitting, it was 1.30 ± 1.48 mmHg (p < 0.001); between ST and supine, it was -1.43 ± 1.74 mmHg (p < 0.001); between ST-5 and supine, it was -0.77 ± 1.59 mmHg (p < 0.001); between prone and supine, it was 2.24 ± 1.92 mmHg (p < 0.001); between ST and ST-5, it was -0.67 ± 1.84 mmHg (range: -7.5 to 5 mmHg) (p = 0.007); between prone and ST, it was 3.46 ± 2.01 mmHg (p < 0.001); between ST-5 and prone, it was -2.46 ± 1.67 mmHg (p < 0.001); and between sitting and prone, it was -3.22 ± 1.56 mmHg (p < 0.001). The results show a significant IOP increase in the ST-5 position, suggesting that such measurements need to be performed in an attempt to explain the progression of glaucoma in apparently normal-tension patients.

Balance in obese and normal weight pregnant women: A longitudinal study

IntroductionPregnancy's physiological changes and weight gain can decrease balance control, increasing the risk of falls and impacting quality of life. The effect of obesity on balance control in pregnant women needs further investigation. ObjectiveInvestigate the effect of obesity during pregnancy on center of pressure (COP) control under sensory disturbances at different gestational age. MethodsThe COP (95% ellipse area, mean velocity and total length) of 23 pregnant women classified as normal weight (CG: n = 12) and obese (OG: n = 11) was evaluated at three gestational-age week times (T1 = 16th, T2 = 24th, T3 = 32nd week) on a force platform on standing position (SP) and under three disturbances: 1) visual disturbance (eyes closed), 2) proprioceptive disturbance (over an unstable surface) and, 3) vestibular disturbance (head movement). A mixed ANOVA (3 repeated measures vs. 2 groups) and LSD post-hoc was applied to examine main effects and interactions. Effect sizes were assessed using generalized eta squared (η2). ResultsAs main effect, in SP, COP area increased from T2 to T3 for both groups (P = 0.021, η2 = 0.193). One interaction was observed, under visual disturbance, the area increased from T2 to T3 only in the CG group (P = 0.020, η2 = 0.195). ConclusionThe progression of pregnancy negatively impacts postural stability throughout its course. Visual disturbance only affected the balance of the CG. Hence, obesity combined with pregnancy does not appear to alter COP variables.

Correlation Between Coronal Position Sequence of Lumbar and WOMAC Score in Knee Osteoarthritis (KOA) in Standard Standing Position.

Sagittal sequences of the spine have been shown to correlate with knee osteoarthritis (KOA), but coronal sequences and KOA have never been studied before. The study required patients to use a standard standing posture and aimed to explore the relationship between coronal position of lumbar spine and WOMAC score in KOA. This is a cross-sectional observational study. Data on a total of 268 patients with KOA were collected. Patients were photographed in a standard standing position and lumbar-sacrum offset distance (L-SOD) and lumbar-knee offset distance (ΔL-KOD) were calculated. Patients were then divided into different groups according to different critical values and differences were compared. In the L-SOD of L1-3, WOMAC function (P = 0.021, P = 0.032, P = 0.001) and total score (P = 0.039, P = 0.034, P < 0.001) were different. In the L-SOD of L3-4, WOMAC pain score were different (P = 0.001, P = 0.032). At a cutoff of 13mm, ΔL-KOD of L1-2 showed significant differences in pain part (P = 0.025, P = 0.039) and total score (P = 0.036, P = 0.050). There were significant differences in pain (P = 0.023, P = 0.027, P = 0.022), function (P = 0.048, P = 0.038, P = 0.047), and total score (P = 0.030, P = 0.027, P = 0.029) of L3-5. In the 18-mm cutoff group, only L1 and L2have differences in the pain part (P = 0.050, P = 0.038). Coronal balance of the lumbar spine is associated with knee pain and function. The pelvis plays an important role in maintaining the coronal balance. Both the lumbar spine and the knee joint should be considered when developing the surgical strategy.

Body Position Dependent Participation of Abdominal and Thoracic Breathing Movements During the Breathing Cycle

Aims: Both abdominal and thoracic breathing movements play important roles in the mechanics of breathing, participating differently in various body positions with abdominal breathing having a greater role. Recent studies showed that an early proning position of awake, non-intubated patients during the COVID-19 pandemic, even during pregnancy (PMID: 32320506, PMID: 33309507, PMID: 34915799) significantly affected the ventilatory parameters and mortality of SARS-CoV-2 patients. Thus, we hypothesized that in different body positions the participation of abdominal (AB) and thoracic breathing (TB) during the complete respiratory cycle (CRC) is different. To test this, we measured the participation of AB and TB to the CRC in different body positions under resting conditions. Methods: In young participants (N=26) age between 18 and 24 (M=21.3±1.6), changes in abdominal and chest circumferences were measured using plethysmography respiratory belts, during inhalation and exhalation in standing (ST), sitting (SI), supine (SU), prone (PR), and all on fours (AF) body positions. Respiratory frequency was also measured. Results: In different positions, the contribution of AB and TB to CRC were significantly different (F(4,100)=4.999, p=0.004, η2p=0.17). AB was significantly higher than TB in all positions (p&lt;0.001). More specifically, AB gradually increased, while TB gradually decreased in the following order: SU(AB/TB) = 74.8±12.9%/25.2%, ST = 69±16%/31%, PR = 66.8±20.2%/33.2%, SI = 65.5±14.8%/34.5%, AF = 61.1±15.1%/38.9%. A significantly higher value was measured in the SU position compared to AF (p&lt;0.001) and SI (p=0.011) positions; PR and ST positions showed intermediate values, which were not significantly different from those yielded by either of the other positions. Respiratory frequency was similar in different body positions. Conclusions: These data show that different body positions significantly affect the participation of abdominal and thoracic breathing during resting condition, underscoring not only the importance of respiratory distress patients positioning during hospitalization, but its usefulness in developing a respiratory training plan for elite athletes to optimize their physical and mental performance in competitive sports. AK: Ministry of Innovation and Technology (MIT) of Hungary-NRDI TKP2020-NKA-17, TKP2021-EGA-37, and National Research, Development, and Innovation Offce (NKFIH) OTKA K 132596 K_19, and Hungarian Academy of Sciences, Post-Covid 2021-34, and HUN-REN-SU: 02068 of Hungary, JT: ÚNKP-22-4-II-SE-4 (JT), TKP2021-EGA-25. This is the full abstract presented at the American Physiology Summit 2024 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.

Adaptation of Postural Sway in a Standing Position during Tilted Video Viewing Using Virtual Reality: A Comparison between Younger and Older Adults.

This study aimed to investigate the effects of wearing virtual reality (VR) with a head-mounted display (HMD) on body sway in younger and older adults. A standing posture with eyes open without an HMD constituted the control condition. Wearing an HMD and viewing a 30°-tilt image and a 60°-tilt image in a resting standing position were the experimental conditions. Measurements were made using a force plate. All conditions were performed three times each and included the X-axis trajectory length (mm), Y-axis trajectory length (mm), total trajectory length (mm), trajectory length per unit time (mm/s), outer peripheral area (mm2), and rectangular area (mm2). The results showed a significant interaction between generation and condition in Y-axis trajectory length (mm) and total trajectory length (mm), with an increased body center-of-gravity sway during the viewing of tilted VR images in older adults than in younger adults in both sexes. The results of this study show that body sway can be induced by visual stimulation alone with VR without movement, suggesting the possibility of providing safe and simple balance training to older adults.

Directed Versus Nondirected Standing Postures in Adolescent Idiopathic Scoliosis: Its Impact on Curve Magnitude, Alignment, and Clinical Decision-Making: Erratum.

Directed Versus Nondirected Standing Postures in Adolescent Idiopathic Scoliosis: Its Impact on Curve Magnitude, Alignment, and Clinical Decision-Making: Erratum.

Prolonged standing and work fatigue on sales promotion girl workers at the Kubu Raya Regency Shopping Center

Standing positions are used for almost all jobs, including sales promotion girl or SPG workers. Standing in working positions for long periods can cause work fatigue. This study aimed to analyze the relationship between the length of work in a standing position and the work fatigue of SPG workers. This research is a cross-sectional study. Fatigue data collection was carried out by interviews using the industrial fatigue research committee (IFRC) questionnaire. Data on the length of work in a standing position are obtained by interview and observation. Based on the results of the study, as many as 66.7% of workers at SPG in the shopping center of Kubu Raya Regency, Indonesia in one day work in a standing position for eight hours, and 33.3% work in a standing position for &amp;gt;8 hours. The average level of work fatigue at the beginning of work is 49.38, and after work is 52.95, with the results of statistical analysis showing a p-value of 0.000, meaning that there is a significant relationship between long-standing position and work fatigue. There is a need for supervision and monitoring related to the work safety system regularly carried out by the manager of the shopping center, which is also supervised by the Ministry of Health and the Ministry of Manpower.

In Vivo Kinematic Analysis of the Axial Shoulder Rotation in the Standing and Supine Positions Using 3D/2D Registration and Electromyography.

Background There has been no report comparing shoulder kinematics and muscle activities during axial shoulder rotation in different positions. The purpose of this study was to investigate differences in shoulder kinematics and muscle activities during axial shoulder rotation in healthy subjects between standing and supine positions using three-dimensional/two-dimensional (3D/2D) registration techniques and electromyography (EMG). Methods Eleven healthy males agreed to participate in this study. We recorded the fluoroscopy time during active shoulder axial rotation with a 90° elbow flexion in both standing and supine positions, simultaneously recording surface EMG of the infraspinatus, anterior deltoid, posterior deltoid, and biceps brachii. Three-dimensional bone models were created from CT images, and shoulder kinematics were analyzed using 3D/2D registration techniques. Muscle activities were evaluated as a ratio of mean electromyographic values to 5-sec maximum voluntary isometric contractions. Results Scapular kinematics during axial shoulder rotation in the supine position showed similar patterns with those in the standing position. The scapula was more posteriorly tilted and more downwardly rotated in the supine posture than in standing (P < 0.001 for both). Acromiohumeral distance (AHD) in the supine posture was significantly larger than in standing. Muscle activities showed no significant differences between postures except for biceps (P < 0.001). Discussion Shoulder kinematics and muscle activities during axial rotation were similar in pattern between standing and supine postures, but there were shifts in scapular pose and AHD. The findings of this study suggest that posture may be an important consideration for the prescription of optimal shoulder therapy following surgery or for the treatment of shoulder disorders.

Appraisal of Restraint Positions for Rumen Skin Clamp Fixation, Stay Suture, and Mobile Small Ruminant Surgical Chute Rumenotomy Based on the Haematology of Kano-Brown Goats

Standing position in large ruminants and lateral recumbence in small ruminants have been the age-long standard restraint approaches when carrying out most surgical procedures, without recourse to the associated induced surgical stress. This study fabricated a mobile small ruminant surgical chute for standing restraint position and compares its associated haematological responses with those induced in lateral recumbence position during rumenotomy in Kano Brown goats (KBGs). Eighteen Kano-Brown goats of both sexes diagnosed of rumen foreign body impaction were allocated to groups A, B and D. Goats in groups A and B underwent rumen skin clamp fixation (RSCF) and stay suture rumenotomy (SSR) techniques respectively, while on lateral recumbency. Goats in group D underwent rumenotomy while on standing restraint in a fabricated mobile small ruminant surgical chute (MSRSC). The six other KBGs diagnosed to be free of the rumen foreign bodies did not undergo any rumenotomy and thus, served as control (Group C). Haematological parameters were assayed pre- and post-rumenotomy at 0, 5, 24, 48, 72 hours and weeks 1, 2 and 3. The mean total white blood cell counts were 11.17 ± 1.4 X 109/L, 9.63 ± 1.44 X 109/L, and 8.58 ± 0.96 X 109/L) for groups A, B, and D respectively, at 0-hour post-rumenotomy. Mean TWBC was lowest at 48 hours in group D, postrumenotomy even though the difference was not significant (P &gt; 0.05). In conclusion, lateral recumbency restraints for Rumen Skin Clamp Fixation and Stay Suture rumenotomy versus standing restraints for Mobile Small Ruminant Surgical Chute Rumenotomy did not significantly impact on Haematology in Kano Brown Goats. This could mean that the fabrication was a success and an alternative to performing surgeries in standing restraints beside the conventional lateral recumbency restraints in ruminants.

Directed Versus non-directed Standing Postures in Adolescent Idiopathic Scoliosis: Its Impact on Curve Magnitude, Alignment and Clinical Decision Making.

Prospective study. To investigate the difference in major curve Cobb angle and alignment between directed and non-directed positioning for adolescent idiopathic scoliosis (AIS) and to evaluate implications on treatment decision-making. Proper positioning of patients with spinal deformities is important for assessing usual functional posture in standing, so management strategies can be customized accordingly. Whether postural variability affects coronal and sagittal radiological parameters and the impact of posture on management decisions remain unknown. Patients with AIS presenting for initial consultation at the tertiary scoliosis clinic were recruited. They were asked to stand in two positions: passive, non-directed position; and directed position by the radiographer. Radiological assessment included major and minor Cobb angle, coronal balance, spinopelvic parameters, sagittal balance and alignment. Cobb angle difference >5⁰ between directed and non-directed positioning was considered clinically impactful. Patients with or without such difference were compared. Over- or under-estimation of the major curve (at 25⁰ or 40⁰) by non-directed positioning were examined due to relevance to bracing and surgical indications. This study included 198 patients, with 22.2% experiencing Cobb angle difference (>5⁰) between positioning. The major curve Cobb angle was smaller in non-directed than directed positioning (median difference: -6.0⁰, upper and lower quartile: -7.8, 5.8), especially for curves ≥30⁰. Patients with a Cobb angle difference had changes in shoulder balance (P=0.007) when assuming a directed position. Non-directed positioning had 14.3% of major Cobb 25⁰ underestimated and 8.8% overestimated, whereas 11.1% of curves >40⁰ were underestimated. Strict adherence to a standardized radiographic protocol is mandatory for reproducing spine radiographs reliable for curve assessment, as a non-directed position demonstrates smaller Cobb angles. Postural variation may lead to over-, or under-estimation, of the curve size relevant for both bracing and surgical decision-making. II.

Sagittal Spinopelvic Alignment in the Standing and Prone Positions of Patients with Old Traumatic Thoracolumbar Kyphosis: Relationship with Immediately Postoperative Parameters

The aim of this study was to investigate the changes in spine-pelvis sagittal parameters from the standing position to the prone position and to study the relationship between sagittal parameters and immediately postoperative parameters. Thirty-six patients with old traumatic spinal fracture combined with kyphosis were enrolled. The preoperative standing position, prone position and postoperative sagittal parameters of the spine and pelvis, including the local kyphosis Cobb angle (LKCA), thoracic kyphosis angle (TK), lumbar lordosis angle (LL), sacral slope (SS), pelvic tilt (PT), pelvic incidence minus lumbar lordosis angle (PI-LL), and sagittal vertebral axis (SVA), were measured. The data of kyphotic flexibility and correction rate was collected and analyzed. The parameters of the preoperative standing position, prone position and postoperative sagittal position were analyzed statistically. Correlation analysis and regression analysis of the preoperative standing and prone sagittal parameters and postoperative parameters were conducted. There were significant differences in the preoperative standing position, prone position and postoperative LKCA and TK. Correlation analysis showed that preoperative sagittal parameters of the standing position and prone position were all correlated with postoperative homogeneity. Flexibility was not related to the correction rate. Regression analysis showed preoperative standing, prone LKCA, and TK were linear with postoperative. The LKCA and TK of old traumatic kyphosis obviously changed from the standing position to the prone position, which were linear with postoperative LKCA and TK and can be used to predict postoperative sagittal parameters. This change should be taken into account in the surgical strategy.

Derivation of Reference Intervals for commonly tested Biochemical analytes from five major Cities of Nepal.

Introduction: &#x0D; Reference interval (RIs) is the range of values provided by laboratory scientists in a convenient and practical form to support clinician for diagnosis, treatment and monitoring of a disease. Clinical laboratories in Nepal uses RIs, provided in the kit inserts by the manufacturers or from the scientific literature, established for western/European population. It is well known that population across the globe differs physiologically, genetically; ethnically, food habits and diet which have great impact on the reference values. Thus, it is inappropriate to use RIs that is not derived for local population. This approach highlights for establishing reference values for Nepalese population using the IFCC-CRIDL guidelines published in (C28-A3).&#x0D; &#x0D; Methods: &#x0D; Reference individuals were selected from healthy volunteers according to the IFCC/C-RIDL protocol in (C28–A3). After exclusion of abnormal samples, a total of 555, age and sex matched apparently healthy subjects of 18-65 were enrolled in the study. Blood samples were collected, serum were separated and stored in well-sealed cryo vials and finally measured collectively in Beckman Coulter AU480, a fully automatic chemistry analyzer. The sources of variations and need for partitioning were analyzed by multiple regression analysis and two-level nested ANOVA respectively.&#x0D; &#x0D; Results: &#x0D; We adopted a threshold of SDR ≥ 0.4 for city wise partitioning. The SDRs for between-city differences (SDRcity) were calculated, which revealed that there is no significant differences for most of the analytes among the cities, except for K, LDH and CK. Total protein, DrkLvl, and Standing Position also shows association but not significant to derive separate RIs. Sex-related changes were typically noted by the criterion of either SDR or BR for UA, Cre, Fe, GGT, IgM, and Tf. From the result, city partitioning was required for 3 analytes, K, LDH, and Drklvl, in male and 4 analytes in TP, K, CK, Standing position in female.&#x0D; &#x0D; Conclusions: The reference intervals for common biochemical parameters in five major cities were derived. Source of variation and need for partitioning of RI was calculated.

A Study on Health Impairments due to Regular Standing Posture of Indian Urban Women

A Study on Health Impairments due to Regular Standing Posture of Indian Urban Women

Posturographic Standards for Optimal Control of Human Standing Posture.

Static posturography is a simple non-invasive technique commonly used in contemporary labs and clinics to quantify the central nervous system adaptive mechanisms involved in the control of posture and balance. Its diagnostic value, however, is quite limited due to the lack of posturographic standards for the stable posture. To solve this problem, in this research, we aimed to establish reference values for the stable human posture using our novel parameters of static posturography including the sway anteroposterior directional index (DIAP), the mediolateral directional index (DIML), the stability vector amplitude (SVamp), and the stability vector azimuth (SVaz). Towards this end, in a population of young (mean age 22 yrs), healthy able-bodied volunteers (50 males and 50 females), trajectories of postural sway, based upon the center-of-pressure (COP), were assessed. The experiment consisted of ten 60 s trials that were carried out 5 times while subjects were standing quietly on the force plate with eyes open (EO test) and 5 times with eyes closed (EC test). Results showed that in young healthy subjects, regardless of gender, the basic variables of COP remained at the following levels: SVamp = 9.2 ± 1.6 mm/s, SVaz = 0.9 ± 0.1 rad, and directional indices DIAP = 0.7 ± 0.05, DIML = 0.56 ± 0.06. Some of the measures were sensitive to visual input (EC trials), and showed a weak to moderate correlation with anthropometric features. These measures can be recommended as reference values that characterize the most stable erect posture.

Characteristics of Sagittal Spinal Alignment of Male University Students in the Upright Standing Position: Focus on Thoracic Hyperkyphosis

Characteristics of Sagittal Spinal Alignment of Male University Students in the Upright Standing Position: Focus on Thoracic Hyperkyphosis

Relationship between Intervertebral Disc Compression Force and Sagittal Spinopelvic Lower Limb Alignment in Elderly Women in Standing Position with Patient-Specific Whole Body Musculoskeletal Model

The intervertebral disc loading based on compensated standing posture in patients with adult spinal deformity remains unclear. We analyzed the relationship between sagittal alignment and disc compression force (Fm). In 14 elderly women, the alignment of the sagittal spinopelvic and lower extremities was measured. Fm was calculated using the Anybody Modeling System. Patients were divided into low sagittal vertical axis (SVA) and high SVA groups. Comparisons between the two groups were performed and the relationship between the Fm and each parameter was examined using Spearman's correlation coefficient (r). The mean lumbar Fm in the high SVA group was 67.6%; significantly higher than that in the low SVA group (p = 0.046). There was a negative correlation between cervical Fm with T1 slope (r = -0.589, p = 0.034) and lumbar Fm with lumbar lordosis (r = -0.566, p = 0.035). Lumbar Fm was positively correlated with center of gravity-SVA (r = 0.615, p = 0.029), T1 slope (r = 0.613, p = 0.026), and SVA (r = 0.612, p = 0.020). The results suggested sagittal malalignment increased the load on the thoracolumbar and lower lumbar discs and was associated with cervical disc loading.

Evaluation of Dynamic Spinal Morphology and Core Muscle Activation in Cyclists—A Comparison between Standing Posture and on the Bicycle

(1) Background: Cycling is characterized by a sustained sitting posture on the bicycle, where physiologic spinal curvatures are modified from standing to cycling. Therefore, the main objective was to evaluate and compare the morphology of the spine and the core muscle activity in standing posture and cycling at low intensity. (2) Methods: Twelve competitive cyclists participated in the study. Spinal morphology was evaluated using an infrared-camera system. Muscle activation was recorded using a surface electromyography device. (3) Conclusions: The lumbar spine changes its morphology from lordosis in standing to kyphosis (lumbar flexion) when pedaling on the bicycle. The sacral tilt significantly increases its anterior tilt when cycling compared to when standing. The spinal morphology and sacral tilt are dynamic depending on the pedal's position during the pedal stroke quadrants. The infraspinatus, latissimus dorsi, external oblique, and pectoralis major showed significantly higher activation pedaling than when standing, although with very low values.